3606 lines
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HTML
3606 lines
200 KiB
HTML
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<!DOCTYPE HTML>
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<html lang="zh-hans" >
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<head>
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<meta charset="UTF-8">
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<title>Service · Kubernetes Handbook - jimmysong.io</title>
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<div class="book">
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<nav role="navigation">
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<ul class="summary">
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<li>
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<a href="https://jimmysong.io" target="_blank" class="custom-link">Jimmy Song</a>
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<li class="divider"></li>
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<li class="header">前言</li>
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<li class="chapter " data-level="1.1" data-path="../">
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<a href="../">
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<b>1.1.</b>
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序言
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</a>
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</li>
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<li class="header">云原生</li>
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<li class="chapter " data-level="2.1" data-path="../cloud-native/play-with-kubernetes.html">
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<a href="../cloud-native/play-with-kubernetes.html">
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<b>2.1.</b>
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Play with Kubernetes
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</a>
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</li>
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<li class="chapter " data-level="2.2" data-path="../cloud-native/kubernetes-and-cloud-native-app-overview.html">
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<a href="../cloud-native/kubernetes-and-cloud-native-app-overview.html">
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<b>2.2.</b>
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Kubernetes与云原生应用概览
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</a>
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</li>
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<li class="chapter " data-level="2.3" data-path="../cloud-native/from-kubernetes-to-cloud-native.html">
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<a href="../cloud-native/from-kubernetes-to-cloud-native.html">
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<b>2.3.</b>
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云原生应用之路——从Kubernetes到Cloud Native
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</a>
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</li>
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<li class="header">概念与原理</li>
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<li class="chapter " data-level="3.1" data-path="./">
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<a href="./">
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<b>3.1.</b>
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Kubernetes架构
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.1.1" data-path="concepts.html">
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<a href="concepts.html">
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<b>3.1.1.</b>
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设计理念
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</a>
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</li>
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<li class="chapter " data-level="3.1.2" data-path="etcd.html">
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<a href="etcd.html">
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<b>3.1.2.</b>
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Etcd解析
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</a>
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</li>
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<li class="chapter " data-level="3.1.3" data-path="open-interfaces.html">
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<a href="open-interfaces.html">
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<b>3.1.3.</b>
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开放接口
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.1.3.1" data-path="cri.html">
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<a href="cri.html">
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<b>3.1.3.1.</b>
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CRI - Container Runtime Interface（容器运行时接口）
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</a>
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</li>
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<li class="chapter " data-level="3.1.3.2" data-path="cni.html">
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<a href="cni.html">
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<b>3.1.3.2.</b>
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CNI - Container Network Interface（容器网络接口）
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</a>
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</li>
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<li class="chapter " data-level="3.1.3.3" data-path="csi.html">
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<a href="csi.html">
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<b>3.1.3.3.</b>
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CSI - Container Storage Interface（容器存储接口）
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||
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||
</a>
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||
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||
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||
</li>
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||
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</ul>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.2" data-path="objects.html">
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<a href="objects.html">
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<b>3.2.</b>
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||
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资源对象与基本概念解析
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||
</a>
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||
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||
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||
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||
<ul class="articles">
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<li class="chapter " data-level="3.2.1" data-path="basic.html">
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||
<a href="basic.html">
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||
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||
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||
<b>3.2.1.</b>
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||
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||
基本概念
|
||
|
||
</a>
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||
|
||
|
||
|
||
<ul class="articles">
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||
|
||
|
||
<li class="chapter " data-level="3.2.1.1" data-path="pod-overview.html">
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||
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||
<a href="pod-overview.html">
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||
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||
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||
<b>3.2.1.1.</b>
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||
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||
Pod概览
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||
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||
</a>
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||
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||
</li>
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||
<li class="chapter " data-level="3.2.1.2" data-path="pod.html">
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||
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||
<a href="pod.html">
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||
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||
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<b>3.2.1.2.</b>
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||
|
||
Pod解析
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||
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||
</a>
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||
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||
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||
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||
</li>
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||
|
||
<li class="chapter " data-level="3.2.1.3" data-path="init-containers.html">
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||
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||
<a href="init-containers.html">
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||
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||
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<b>3.2.1.3.</b>
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||
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||
Init容器
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||
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||
</a>
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||
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||
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||
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||
</li>
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||
|
||
<li class="chapter " data-level="3.2.1.4" data-path="pod-security-policy.html">
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||
|
||
<a href="pod-security-policy.html">
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||
|
||
|
||
<b>3.2.1.4.</b>
|
||
|
||
Pod安全策略
|
||
|
||
</a>
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||
|
||
|
||
|
||
</li>
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||
|
||
<li class="chapter " data-level="3.2.1.5" data-path="pod-lifecycle.html">
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||
|
||
<a href="pod-lifecycle.html">
|
||
|
||
|
||
<b>3.2.1.5.</b>
|
||
|
||
Pod的生命周期
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.1.6" data-path="pod-hook.html">
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||
|
||
<a href="pod-hook.html">
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||
|
||
|
||
<b>3.2.1.6.</b>
|
||
|
||
Pod Hook
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.1.7" data-path="pod-preset.html">
|
||
|
||
<a href="pod-preset.html">
|
||
|
||
|
||
<b>3.2.1.7.</b>
|
||
|
||
Pod Preset
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.1.8" data-path="pod-disruption-budget.html">
|
||
|
||
<a href="pod-disruption-budget.html">
|
||
|
||
|
||
<b>3.2.1.8.</b>
|
||
|
||
Pod中断与PDB（Pod中断预算）
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
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||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.2" data-path="cluster.html">
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||
|
||
<a href="cluster.html">
|
||
|
||
|
||
<b>3.2.2.</b>
|
||
|
||
集群配置
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="3.2.2.1" data-path="node.html">
|
||
|
||
<a href="node.html">
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||
|
||
|
||
<b>3.2.2.1.</b>
|
||
|
||
Node
|
||
|
||
</a>
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||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.2.2" data-path="namespace.html">
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||
|
||
<a href="namespace.html">
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||
|
||
|
||
<b>3.2.2.2.</b>
|
||
|
||
Namespace
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.2.3" data-path="label.html">
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||
|
||
<a href="label.html">
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||
|
||
|
||
<b>3.2.2.3.</b>
|
||
|
||
Label
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.2.4" data-path="annotation.html">
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||
|
||
<a href="annotation.html">
|
||
|
||
|
||
<b>3.2.2.4.</b>
|
||
|
||
Annotation
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.2.5" data-path="taint-and-toleration.html">
|
||
|
||
<a href="taint-and-toleration.html">
|
||
|
||
|
||
<b>3.2.2.5.</b>
|
||
|
||
Taint和Toleration（污点和容忍）
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.2.6" data-path="garbage-collection.html">
|
||
|
||
<a href="garbage-collection.html">
|
||
|
||
|
||
<b>3.2.2.6.</b>
|
||
|
||
垃圾收集
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.3" data-path="controllers.html">
|
||
|
||
<a href="controllers.html">
|
||
|
||
|
||
<b>3.2.3.</b>
|
||
|
||
控制器
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="3.2.3.1" data-path="deployment.html">
|
||
|
||
<a href="deployment.html">
|
||
|
||
|
||
<b>3.2.3.1.</b>
|
||
|
||
Deployment
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.3.2" data-path="statefulset.html">
|
||
|
||
<a href="statefulset.html">
|
||
|
||
|
||
<b>3.2.3.2.</b>
|
||
|
||
StatefulSet
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.3.3" data-path="daemonset.html">
|
||
|
||
<a href="daemonset.html">
|
||
|
||
|
||
<b>3.2.3.3.</b>
|
||
|
||
DaemonSet
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.3.4" data-path="replicaset.html">
|
||
|
||
<a href="replicaset.html">
|
||
|
||
|
||
<b>3.2.3.4.</b>
|
||
|
||
ReplicationController和ReplicaSet
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.3.5" data-path="job.html">
|
||
|
||
<a href="job.html">
|
||
|
||
|
||
<b>3.2.3.5.</b>
|
||
|
||
Job
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.3.6" data-path="cronjob.html">
|
||
|
||
<a href="cronjob.html">
|
||
|
||
|
||
<b>3.2.3.6.</b>
|
||
|
||
CronJob
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.3.7" data-path="horizontal-pod-autoscaling.html">
|
||
|
||
<a href="horizontal-pod-autoscaling.html">
|
||
|
||
|
||
<b>3.2.3.7.</b>
|
||
|
||
Horizontal Pod Autoscaling
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="3.2.3.7.1" data-path="custom-metrics-hpa.html">
|
||
|
||
<a href="custom-metrics-hpa.html">
|
||
|
||
|
||
<b>3.2.3.7.1.</b>
|
||
|
||
自定义指标HPA
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.4" data-path="service-discovery.html">
|
||
|
||
<a href="service-discovery.html">
|
||
|
||
|
||
<b>3.2.4.</b>
|
||
|
||
服务发现
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter active" data-level="3.2.4.1" data-path="service.html">
|
||
|
||
<a href="service.html">
|
||
|
||
|
||
<b>3.2.4.1.</b>
|
||
|
||
Service
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.4.2" data-path="ingress.html">
|
||
|
||
<a href="ingress.html">
|
||
|
||
|
||
<b>3.2.4.2.</b>
|
||
|
||
Ingress
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="3.2.4.2.1" data-path="traefik-ingress-controller.html">
|
||
|
||
<a href="traefik-ingress-controller.html">
|
||
|
||
|
||
<b>3.2.4.2.1.</b>
|
||
|
||
Traefik Ingress Controller
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.5" data-path="authentication-and-permission.html">
|
||
|
||
<a href="authentication-and-permission.html">
|
||
|
||
|
||
<b>3.2.5.</b>
|
||
|
||
身份与权限控制
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="3.2.5.1" data-path="serviceaccount.html">
|
||
|
||
<a href="serviceaccount.html">
|
||
|
||
|
||
<b>3.2.5.1.</b>
|
||
|
||
ServiceAccount
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.5.2" data-path="rbac.html">
|
||
|
||
<a href="rbac.html">
|
||
|
||
|
||
<b>3.2.5.2.</b>
|
||
|
||
RBAC——基于角色的访问控制
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.5.3" data-path="network-policy.html">
|
||
|
||
<a href="network-policy.html">
|
||
|
||
|
||
<b>3.2.5.3.</b>
|
||
|
||
NetworkPolicy
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.6" data-path="storage.html">
|
||
|
||
<a href="storage.html">
|
||
|
||
|
||
<b>3.2.6.</b>
|
||
|
||
存储
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="3.2.6.1" data-path="secret.html">
|
||
|
||
<a href="secret.html">
|
||
|
||
|
||
<b>3.2.6.1.</b>
|
||
|
||
Secret
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.6.2" data-path="configmap.html">
|
||
|
||
<a href="configmap.html">
|
||
|
||
|
||
<b>3.2.6.2.</b>
|
||
|
||
ConfigMap
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="3.2.6.2.1" data-path="configmap-hot-update.html">
|
||
|
||
<a href="configmap-hot-update.html">
|
||
|
||
|
||
<b>3.2.6.2.1.</b>
|
||
|
||
ConfigMap的热更新
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.6.3" data-path="volume.html">
|
||
|
||
<a href="volume.html">
|
||
|
||
|
||
<b>3.2.6.3.</b>
|
||
|
||
Volume
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.6.4" data-path="persistent-volume.html">
|
||
|
||
<a href="persistent-volume.html">
|
||
|
||
|
||
<b>3.2.6.4.</b>
|
||
|
||
Persistent Volume（持久化卷）
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.6.5" data-path="storageclass.html">
|
||
|
||
<a href="storageclass.html">
|
||
|
||
|
||
<b>3.2.6.5.</b>
|
||
|
||
Storage Class
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.7" data-path="extension.html">
|
||
|
||
<a href="extension.html">
|
||
|
||
|
||
<b>3.2.7.</b>
|
||
|
||
扩展
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="3.2.7.1" data-path="custom-resource.html">
|
||
|
||
<a href="custom-resource.html">
|
||
|
||
|
||
<b>3.2.7.1.</b>
|
||
|
||
使用自定义资源扩展API
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.7.2" data-path="aggregated-api-server.html">
|
||
|
||
<a href="aggregated-api-server.html">
|
||
|
||
|
||
<b>3.2.7.2.</b>
|
||
|
||
Aggregated API Server
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="3.2.7.3" data-path="apiservice.html">
|
||
|
||
<a href="apiservice.html">
|
||
|
||
|
||
<b>3.2.7.3.</b>
|
||
|
||
APIService
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
<li class="header">用户指南</li>
|
||
|
||
|
||
|
||
<li class="chapter " data-level="4.1" data-path="../guide/">
|
||
|
||
<a href="../guide/">
|
||
|
||
|
||
<b>4.1.</b>
|
||
|
||
用户指南
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.2" data-path="../guide/resource-configuration.html">
|
||
|
||
<a href="../guide/resource-configuration.html">
|
||
|
||
|
||
<b>4.2.</b>
|
||
|
||
资源对象配置
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="4.2.1" data-path="../guide/configure-liveness-readiness-probes.html">
|
||
|
||
<a href="../guide/configure-liveness-readiness-probes.html">
|
||
|
||
|
||
<b>4.2.1.</b>
|
||
|
||
配置Pod的liveness和readiness探针
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.2.2" data-path="../guide/configure-pod-service-account.html">
|
||
|
||
<a href="../guide/configure-pod-service-account.html">
|
||
|
||
|
||
<b>4.2.2.</b>
|
||
|
||
配置Pod的Service Account
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.2.3" data-path="../guide/secret-configuration.html">
|
||
|
||
<a href="../guide/secret-configuration.html">
|
||
|
||
|
||
<b>4.2.3.</b>
|
||
|
||
Secret配置
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.2.4" data-path="../guide/resource-quota-management.html">
|
||
|
||
<a href="../guide/resource-quota-management.html">
|
||
|
||
|
||
<b>4.2.4.</b>
|
||
|
||
管理namespace中的资源配额
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.3" data-path="../guide/command-usage.html">
|
||
|
||
<a href="../guide/command-usage.html">
|
||
|
||
|
||
<b>4.3.</b>
|
||
|
||
命令使用
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="4.3.1" data-path="../guide/docker-cli-to-kubectl.html">
|
||
|
||
<a href="../guide/docker-cli-to-kubectl.html">
|
||
|
||
|
||
<b>4.3.1.</b>
|
||
|
||
docker用户过度到kubectl命令行指南
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.3.2" data-path="../guide/using-kubectl.html">
|
||
|
||
<a href="../guide/using-kubectl.html">
|
||
|
||
|
||
<b>4.3.2.</b>
|
||
|
||
kubectl命令概览
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.3.3" data-path="../guide/kubectl-cheatsheet.html">
|
||
|
||
<a href="../guide/kubectl-cheatsheet.html">
|
||
|
||
|
||
<b>4.3.3.</b>
|
||
|
||
kubectl命令技巧大全
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.3.4" data-path="../guide/using-etcdctl-to-access-kubernetes-data.html">
|
||
|
||
<a href="../guide/using-etcdctl-to-access-kubernetes-data.html">
|
||
|
||
|
||
<b>4.3.4.</b>
|
||
|
||
使用etcdctl访问kubernetes数据
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.4" data-path="../guide/cluster-security-management.html">
|
||
|
||
<a href="../guide/cluster-security-management.html">
|
||
|
||
|
||
<b>4.4.</b>
|
||
|
||
集群安全性管理
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="4.4.1" data-path="../guide/managing-tls-in-a-cluster.html">
|
||
|
||
<a href="../guide/managing-tls-in-a-cluster.html">
|
||
|
||
|
||
<b>4.4.1.</b>
|
||
|
||
管理集群中的TLS
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.4.2" data-path="../guide/kubelet-authentication-authorization.html">
|
||
|
||
<a href="../guide/kubelet-authentication-authorization.html">
|
||
|
||
|
||
<b>4.4.2.</b>
|
||
|
||
kubelet的认证授权
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.4.3" data-path="../guide/tls-bootstrapping.html">
|
||
|
||
<a href="../guide/tls-bootstrapping.html">
|
||
|
||
|
||
<b>4.4.3.</b>
|
||
|
||
TLS bootstrap
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.4.4" data-path="../guide/kubectl-user-authentication-authorization.html">
|
||
|
||
<a href="../guide/kubectl-user-authentication-authorization.html">
|
||
|
||
|
||
<b>4.4.4.</b>
|
||
|
||
创建用户认证授权的kubeconfig文件
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.4.5" data-path="../guide/ip-masq-agent.html">
|
||
|
||
<a href="../guide/ip-masq-agent.html">
|
||
|
||
|
||
<b>4.4.5.</b>
|
||
|
||
IP伪装代理
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.4.6" data-path="../guide/auth-with-kubeconfig-or-token.html">
|
||
|
||
<a href="../guide/auth-with-kubeconfig-or-token.html">
|
||
|
||
|
||
<b>4.4.6.</b>
|
||
|
||
使用kubeconfig或token进行用户身份认证
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.4.7" data-path="../guide/authentication.html">
|
||
|
||
<a href="../guide/authentication.html">
|
||
|
||
|
||
<b>4.4.7.</b>
|
||
|
||
Kubernetes中的用户与身份认证授权
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.5" data-path="../guide/access-kubernetes-cluster.html">
|
||
|
||
<a href="../guide/access-kubernetes-cluster.html">
|
||
|
||
|
||
<b>4.5.</b>
|
||
|
||
访问Kubernetes集群
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="4.5.1" data-path="../guide/access-cluster.html">
|
||
|
||
<a href="../guide/access-cluster.html">
|
||
|
||
|
||
<b>4.5.1.</b>
|
||
|
||
访问集群
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.5.2" data-path="../guide/authenticate-across-clusters-kubeconfig.html">
|
||
|
||
<a href="../guide/authenticate-across-clusters-kubeconfig.html">
|
||
|
||
|
||
<b>4.5.2.</b>
|
||
|
||
使用kubeconfig文件配置跨集群认证
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.5.3" data-path="../guide/connecting-to-applications-port-forward.html">
|
||
|
||
<a href="../guide/connecting-to-applications-port-forward.html">
|
||
|
||
|
||
<b>4.5.3.</b>
|
||
|
||
通过端口转发访问集群中的应用程序
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.5.4" data-path="../guide/service-access-application-cluster.html">
|
||
|
||
<a href="../guide/service-access-application-cluster.html">
|
||
|
||
|
||
<b>4.5.4.</b>
|
||
|
||
使用service访问群集中的应用程序
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.5.5" data-path="../guide/accessing-kubernetes-pods-from-outside-of-the-cluster.html">
|
||
|
||
<a href="../guide/accessing-kubernetes-pods-from-outside-of-the-cluster.html">
|
||
|
||
|
||
<b>4.5.5.</b>
|
||
|
||
从外部访问Kubernetes中的Pod
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.5.6" data-path="../guide/cabin-mobile-dashboard-for-kubernetes.html">
|
||
|
||
<a href="../guide/cabin-mobile-dashboard-for-kubernetes.html">
|
||
|
||
|
||
<b>4.5.6.</b>
|
||
|
||
Cabin - Kubernetes手机客户端
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.5.7" data-path="../guide/kubernetes-desktop-client.html">
|
||
|
||
<a href="../guide/kubernetes-desktop-client.html">
|
||
|
||
|
||
<b>4.5.7.</b>
|
||
|
||
Kubernetic - Kubernetes桌面客户端
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.5.8" data-path="../guide/kubernator-kubernetes-ui.html">
|
||
|
||
<a href="../guide/kubernator-kubernetes-ui.html">
|
||
|
||
|
||
<b>4.5.8.</b>
|
||
|
||
Kubernator - 更底层的Kubernetes UI
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.6" data-path="../guide/application-development-deployment-flow.html">
|
||
|
||
<a href="../guide/application-development-deployment-flow.html">
|
||
|
||
|
||
<b>4.6.</b>
|
||
|
||
在Kubernetes中开发部署应用
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="4.6.1" data-path="../guide/deploy-applications-in-kubernetes.html">
|
||
|
||
<a href="../guide/deploy-applications-in-kubernetes.html">
|
||
|
||
|
||
<b>4.6.1.</b>
|
||
|
||
适用于kubernetes的应用开发部署流程
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.6.2" data-path="../guide/migrating-hadoop-yarn-to-kubernetes.html">
|
||
|
||
<a href="../guide/migrating-hadoop-yarn-to-kubernetes.html">
|
||
|
||
|
||
<b>4.6.2.</b>
|
||
|
||
迁移传统应用到Kubernetes中——以Hadoop YARN为例
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="4.6.3" data-path="../guide/using-statefulset.html">
|
||
|
||
<a href="../guide/using-statefulset.html">
|
||
|
||
|
||
<b>4.6.3.</b>
|
||
|
||
使用StatefulSet部署用状态应用
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
<li class="header">最佳实践</li>
|
||
|
||
|
||
|
||
<li class="chapter " data-level="5.1" data-path="../practice/">
|
||
|
||
<a href="../practice/">
|
||
|
||
|
||
<b>5.1.</b>
|
||
|
||
最佳实践概览
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.2" data-path="../practice/install-kubernetes-on-centos.html">
|
||
|
||
<a href="../practice/install-kubernetes-on-centos.html">
|
||
|
||
|
||
<b>5.2.</b>
|
||
|
||
在CentOS上部署Kubernetes集群
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="5.2.1" data-path="../practice/create-tls-and-secret-key.html">
|
||
|
||
<a href="../practice/create-tls-and-secret-key.html">
|
||
|
||
|
||
<b>5.2.1.</b>
|
||
|
||
创建TLS证书和秘钥
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.2.2" data-path="../practice/create-kubeconfig.html">
|
||
|
||
<a href="../practice/create-kubeconfig.html">
|
||
|
||
|
||
<b>5.2.2.</b>
|
||
|
||
创建kubeconfig文件
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.2.3" data-path="../practice/etcd-cluster-installation.html">
|
||
|
||
<a href="../practice/etcd-cluster-installation.html">
|
||
|
||
|
||
<b>5.2.3.</b>
|
||
|
||
创建高可用etcd集群
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.2.4" data-path="../practice/kubectl-installation.html">
|
||
|
||
<a href="../practice/kubectl-installation.html">
|
||
|
||
|
||
<b>5.2.4.</b>
|
||
|
||
安装kubectl命令行工具
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.2.5" data-path="../practice/master-installation.html">
|
||
|
||
<a href="../practice/master-installation.html">
|
||
|
||
|
||
<b>5.2.5.</b>
|
||
|
||
部署master节点
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.2.6" data-path="../practice/flannel-installation.html">
|
||
|
||
<a href="../practice/flannel-installation.html">
|
||
|
||
|
||
<b>5.2.6.</b>
|
||
|
||
安装flannel网络插件
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.2.7" data-path="../practice/node-installation.html">
|
||
|
||
<a href="../practice/node-installation.html">
|
||
|
||
|
||
<b>5.2.7.</b>
|
||
|
||
部署node节点
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.2.8" data-path="../practice/kubedns-addon-installation.html">
|
||
|
||
<a href="../practice/kubedns-addon-installation.html">
|
||
|
||
|
||
<b>5.2.8.</b>
|
||
|
||
安装kubedns插件
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.2.9" data-path="../practice/dashboard-addon-installation.html">
|
||
|
||
<a href="../practice/dashboard-addon-installation.html">
|
||
|
||
|
||
<b>5.2.9.</b>
|
||
|
||
安装dashboard插件
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.2.10" data-path="../practice/heapster-addon-installation.html">
|
||
|
||
<a href="../practice/heapster-addon-installation.html">
|
||
|
||
|
||
<b>5.2.10.</b>
|
||
|
||
安装heapster插件
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.2.11" data-path="../practice/efk-addon-installation.html">
|
||
|
||
<a href="../practice/efk-addon-installation.html">
|
||
|
||
|
||
<b>5.2.11.</b>
|
||
|
||
安装EFK插件
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.3" data-path="../practice/service-discovery-and-loadbalancing.html">
|
||
|
||
<a href="../practice/service-discovery-and-loadbalancing.html">
|
||
|
||
|
||
<b>5.3.</b>
|
||
|
||
服务发现与负载均衡
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="5.3.1" data-path="../practice/traefik-ingress-installation.html">
|
||
|
||
<a href="../practice/traefik-ingress-installation.html">
|
||
|
||
|
||
<b>5.3.1.</b>
|
||
|
||
安装Traefik ingress
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.3.2" data-path="../practice/distributed-load-test.html">
|
||
|
||
<a href="../practice/distributed-load-test.html">
|
||
|
||
|
||
<b>5.3.2.</b>
|
||
|
||
分布式负载测试
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.3.3" data-path="../practice/network-and-cluster-perfermance-test.html">
|
||
|
||
<a href="../practice/network-and-cluster-perfermance-test.html">
|
||
|
||
|
||
<b>5.3.3.</b>
|
||
|
||
网络和集群性能测试
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.3.4" data-path="../practice/edge-node-configuration.html">
|
||
|
||
<a href="../practice/edge-node-configuration.html">
|
||
|
||
|
||
<b>5.3.4.</b>
|
||
|
||
边缘节点配置
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.3.5" data-path="../practice/nginx-ingress-installation.html">
|
||
|
||
<a href="../practice/nginx-ingress-installation.html">
|
||
|
||
|
||
<b>5.3.5.</b>
|
||
|
||
安装Nginx ingress
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.3.6" data-path="../practice/configuring-dns.html">
|
||
|
||
<a href="../practice/configuring-dns.html">
|
||
|
||
|
||
<b>5.3.6.</b>
|
||
|
||
配置内置DNS（kube-dns）
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.4" data-path="../practice/operation.html">
|
||
|
||
<a href="../practice/operation.html">
|
||
|
||
|
||
<b>5.4.</b>
|
||
|
||
运维管理
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="5.4.1" data-path="../practice/service-rolling-update.html">
|
||
|
||
<a href="../practice/service-rolling-update.html">
|
||
|
||
|
||
<b>5.4.1.</b>
|
||
|
||
服务滚动升级
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.4.2" data-path="../practice/app-log-collection.html">
|
||
|
||
<a href="../practice/app-log-collection.html">
|
||
|
||
|
||
<b>5.4.2.</b>
|
||
|
||
应用日志收集
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.4.3" data-path="../practice/configuration-best-practice.html">
|
||
|
||
<a href="../practice/configuration-best-practice.html">
|
||
|
||
|
||
<b>5.4.3.</b>
|
||
|
||
配置最佳实践
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.4.4" data-path="../practice/monitor.html">
|
||
|
||
<a href="../practice/monitor.html">
|
||
|
||
|
||
<b>5.4.4.</b>
|
||
|
||
集群及应用监控
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.4.5" data-path="../practice/data-persistence-problem.html">
|
||
|
||
<a href="../practice/data-persistence-problem.html">
|
||
|
||
|
||
<b>5.4.5.</b>
|
||
|
||
数据持久化问题
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.4.6" data-path="../practice/manage-compute-resources-container.html">
|
||
|
||
<a href="../practice/manage-compute-resources-container.html">
|
||
|
||
|
||
<b>5.4.6.</b>
|
||
|
||
管理容器的计算资源
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.5" data-path="../practice/storage.html">
|
||
|
||
<a href="../practice/storage.html">
|
||
|
||
|
||
<b>5.5.</b>
|
||
|
||
存储管理
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="5.5.1" data-path="../practice/glusterfs.html">
|
||
|
||
<a href="../practice/glusterfs.html">
|
||
|
||
|
||
<b>5.5.1.</b>
|
||
|
||
GlusterFS
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="5.5.1.1" data-path="../practice/using-glusterfs-for-persistent-storage.html">
|
||
|
||
<a href="../practice/using-glusterfs-for-persistent-storage.html">
|
||
|
||
|
||
<b>5.5.1.1.</b>
|
||
|
||
使用GlusterFS做持久化存储
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.5.1.2" data-path="../practice/storage-for-containers-using-glusterfs-with-openshift.html">
|
||
|
||
<a href="../practice/storage-for-containers-using-glusterfs-with-openshift.html">
|
||
|
||
|
||
<b>5.5.1.2.</b>
|
||
|
||
在OpenShift中使用GlusterFS做持久化存储
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.5.2" data-path="../practice/cephfs.html">
|
||
|
||
<a href="../practice/cephfs.html">
|
||
|
||
|
||
<b>5.5.2.</b>
|
||
|
||
CephFS
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="5.5.2.1" data-path="../practice/using-ceph-for-persistent-storage.html">
|
||
|
||
<a href="../practice/using-ceph-for-persistent-storage.html">
|
||
|
||
|
||
<b>5.5.2.1.</b>
|
||
|
||
使用Ceph做持久化存储
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.5.3" data-path="../practice/openebs.html">
|
||
|
||
<a href="../practice/openebs.html">
|
||
|
||
|
||
<b>5.5.3.</b>
|
||
|
||
OpenEBS
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="5.5.3.1" data-path="../practice/using-openebs-for-persistent-storage.html">
|
||
|
||
<a href="../practice/using-openebs-for-persistent-storage.html">
|
||
|
||
|
||
<b>5.5.3.1.</b>
|
||
|
||
使用OpenEBS做持久化存储
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.6" data-path="../practice/monitoring.html">
|
||
|
||
<a href="../practice/monitoring.html">
|
||
|
||
|
||
<b>5.6.</b>
|
||
|
||
集群与应用监控
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="5.6.1" data-path="../practice/heapster.html">
|
||
|
||
<a href="../practice/heapster.html">
|
||
|
||
|
||
<b>5.6.1.</b>
|
||
|
||
Heapster
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="5.6.1.1" data-path="../practice/using-heapster-to-get-object-metrics.html">
|
||
|
||
<a href="../practice/using-heapster-to-get-object-metrics.html">
|
||
|
||
|
||
<b>5.6.1.1.</b>
|
||
|
||
使用Heapster获取集群和对象的metric数据
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.6.2" data-path="../practice/prometheus.html">
|
||
|
||
<a href="../practice/prometheus.html">
|
||
|
||
|
||
<b>5.6.2.</b>
|
||
|
||
Prometheus
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="5.6.2.1" data-path="../practice/using-prometheus-to-monitor-kuberentes-cluster.html">
|
||
|
||
<a href="../practice/using-prometheus-to-monitor-kuberentes-cluster.html">
|
||
|
||
|
||
<b>5.6.2.1.</b>
|
||
|
||
使用Prometheus监控kubernetes集群
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.7" data-path="../practice/services-management-tool.html">
|
||
|
||
<a href="../practice/services-management-tool.html">
|
||
|
||
|
||
<b>5.7.</b>
|
||
|
||
服务编排管理
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="5.7.1" data-path="../practice/helm.html">
|
||
|
||
<a href="../practice/helm.html">
|
||
|
||
|
||
<b>5.7.1.</b>
|
||
|
||
使用Helm管理kubernetes应用
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.7.2" data-path="../practice/create-private-charts-repo.html">
|
||
|
||
<a href="../practice/create-private-charts-repo.html">
|
||
|
||
|
||
<b>5.7.2.</b>
|
||
|
||
构建私有Chart仓库
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.8" data-path="../practice/ci-cd.html">
|
||
|
||
<a href="../practice/ci-cd.html">
|
||
|
||
|
||
<b>5.8.</b>
|
||
|
||
持续集成与发布
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="5.8.1" data-path="../practice/jenkins-ci-cd.html">
|
||
|
||
<a href="../practice/jenkins-ci-cd.html">
|
||
|
||
|
||
<b>5.8.1.</b>
|
||
|
||
使用Jenkins进行持续集成与发布
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.8.2" data-path="../practice/drone-ci-cd.html">
|
||
|
||
<a href="../practice/drone-ci-cd.html">
|
||
|
||
|
||
<b>5.8.2.</b>
|
||
|
||
使用Drone进行持续集成与发布
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.9" data-path="../practice/update-and-upgrade.html">
|
||
|
||
<a href="../practice/update-and-upgrade.html">
|
||
|
||
|
||
<b>5.9.</b>
|
||
|
||
更新与升级
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="5.9.1" data-path="../practice/manually-upgrade.html">
|
||
|
||
<a href="../practice/manually-upgrade.html">
|
||
|
||
|
||
<b>5.9.1.</b>
|
||
|
||
手动升级Kubernetes集群
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="5.9.2" data-path="../practice/dashboard-upgrade.html">
|
||
|
||
<a href="../practice/dashboard-upgrade.html">
|
||
|
||
|
||
<b>5.9.2.</b>
|
||
|
||
升级dashboard
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
<li class="header">领域应用</li>
|
||
|
||
|
||
|
||
<li class="chapter " data-level="6.1" data-path="../usecases/">
|
||
|
||
<a href="../usecases/">
|
||
|
||
|
||
<b>6.1.</b>
|
||
|
||
领域应用概览
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="6.2" data-path="../usecases/microservices.html">
|
||
|
||
<a href="../usecases/microservices.html">
|
||
|
||
|
||
<b>6.2.</b>
|
||
|
||
微服务架构
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="6.2.1" data-path="../usecases/service-discovery-in-microservices.html">
|
||
|
||
<a href="../usecases/service-discovery-in-microservices.html">
|
||
|
||
|
||
<b>6.2.1.</b>
|
||
|
||
微服务中的服务发现
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="6.3" data-path="../usecases/service-mesh.html">
|
||
|
||
<a href="../usecases/service-mesh.html">
|
||
|
||
|
||
<b>6.3.</b>
|
||
|
||
Service Mesh 服务网格
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="6.3.1" data-path="../usecases/istio.html">
|
||
|
||
<a href="../usecases/istio.html">
|
||
|
||
|
||
<b>6.3.1.</b>
|
||
|
||
Istio
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="6.3.1.1" data-path="../usecases/istio-installation.html">
|
||
|
||
<a href="../usecases/istio-installation.html">
|
||
|
||
|
||
<b>6.3.1.1.</b>
|
||
|
||
安装并试用Istio service mesh
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="6.3.1.2" data-path="../usecases/configuring-request-routing.html">
|
||
|
||
<a href="../usecases/configuring-request-routing.html">
|
||
|
||
|
||
<b>6.3.1.2.</b>
|
||
|
||
配置请求的路由规则
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="6.3.1.3" data-path="../usecases/install-and-expand-istio-mesh.html">
|
||
|
||
<a href="../usecases/install-and-expand-istio-mesh.html">
|
||
|
||
|
||
<b>6.3.1.3.</b>
|
||
|
||
安装和拓展Istio service mesh
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="6.3.1.4" data-path="../usecases/integrating-vms.html">
|
||
|
||
<a href="../usecases/integrating-vms.html">
|
||
|
||
|
||
<b>6.3.1.4.</b>
|
||
|
||
集成虚拟机
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="6.3.2" data-path="../usecases/linkerd.html">
|
||
|
||
<a href="../usecases/linkerd.html">
|
||
|
||
|
||
<b>6.3.2.</b>
|
||
|
||
Linkerd
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="6.3.2.1" data-path="../usecases/linkerd-user-guide.html">
|
||
|
||
<a href="../usecases/linkerd-user-guide.html">
|
||
|
||
|
||
<b>6.3.2.1.</b>
|
||
|
||
Linkerd 使用指南
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="6.3.3" data-path="../usecases/conduit.html">
|
||
|
||
<a href="../usecases/conduit.html">
|
||
|
||
|
||
<b>6.3.3.</b>
|
||
|
||
Conduit
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="6.3.3.1" data-path="../usecases/conduit-overview.html">
|
||
|
||
<a href="../usecases/conduit-overview.html">
|
||
|
||
|
||
<b>6.3.3.1.</b>
|
||
|
||
Condiut概览
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="6.3.3.2" data-path="../usecases/conduit-installation.html">
|
||
|
||
<a href="../usecases/conduit-installation.html">
|
||
|
||
|
||
<b>6.3.3.2.</b>
|
||
|
||
安装Conduit
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="6.4" data-path="../usecases/big-data.html">
|
||
|
||
<a href="../usecases/big-data.html">
|
||
|
||
|
||
<b>6.4.</b>
|
||
|
||
大数据
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="6.4.1" data-path="../usecases/spark-standalone-on-kubernetes.html">
|
||
|
||
<a href="../usecases/spark-standalone-on-kubernetes.html">
|
||
|
||
|
||
<b>6.4.1.</b>
|
||
|
||
Spark standalone on Kubernetes
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="6.4.2" data-path="../usecases/running-spark-with-kubernetes-native-scheduler.html">
|
||
|
||
<a href="../usecases/running-spark-with-kubernetes-native-scheduler.html">
|
||
|
||
|
||
<b>6.4.2.</b>
|
||
|
||
运行支持Kubernetes原生调度的Spark程序
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="6.5" data-path="../usecases/serverless.html">
|
||
|
||
<a href="../usecases/serverless.html">
|
||
|
||
|
||
<b>6.5.</b>
|
||
|
||
Serverless架构
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="6.5.1" data-path="../usecases/understanding-serverless.html">
|
||
|
||
<a href="../usecases/understanding-serverless.html">
|
||
|
||
|
||
<b>6.5.1.</b>
|
||
|
||
理解Serverless
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="6.5.2" data-path="../usecases/faas.html">
|
||
|
||
<a href="../usecases/faas.html">
|
||
|
||
|
||
<b>6.5.2.</b>
|
||
|
||
FaaS-函数即服务
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="6.5.2.1" data-path="../usecases/openfaas-quick-start.html">
|
||
|
||
<a href="../usecases/openfaas-quick-start.html">
|
||
|
||
|
||
<b>6.5.2.1.</b>
|
||
|
||
OpenFaaS快速入门指南
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="6.6" data-path="../usecases/edge-computing.html">
|
||
|
||
<a href="../usecases/edge-computing.html">
|
||
|
||
|
||
<b>6.6.</b>
|
||
|
||
边缘计算
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
<li class="header">开发指南</li>
|
||
|
||
|
||
|
||
<li class="chapter " data-level="7.1" data-path="../develop/">
|
||
|
||
<a href="../develop/">
|
||
|
||
|
||
<b>7.1.</b>
|
||
|
||
开发指南概览
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="7.2" data-path="../develop/sigs-and-working-group.html">
|
||
|
||
<a href="../develop/sigs-and-working-group.html">
|
||
|
||
|
||
<b>7.2.</b>
|
||
|
||
SIG和工作组
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="7.3" data-path="../develop/developing-environment.html">
|
||
|
||
<a href="../develop/developing-environment.html">
|
||
|
||
|
||
<b>7.3.</b>
|
||
|
||
开发环境搭建
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="7.4" data-path="../develop/testing.html">
|
||
|
||
<a href="../develop/testing.html">
|
||
|
||
|
||
<b>7.4.</b>
|
||
|
||
单元测试和集成测试
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="7.5" data-path="../develop/client-go-sample.html">
|
||
|
||
<a href="../develop/client-go-sample.html">
|
||
|
||
|
||
<b>7.5.</b>
|
||
|
||
client-go示例
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="7.6" data-path="../develop/operator.html">
|
||
|
||
<a href="../develop/operator.html">
|
||
|
||
|
||
<b>7.6.</b>
|
||
|
||
Operator
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="7.7" data-path="../develop/contribute.html">
|
||
|
||
<a href="../develop/contribute.html">
|
||
|
||
|
||
<b>7.7.</b>
|
||
|
||
社区贡献
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="7.8" data-path="../develop/minikube.html">
|
||
|
||
<a href="../develop/minikube.html">
|
||
|
||
|
||
<b>7.8.</b>
|
||
|
||
Minikube
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
<li class="header">附录</li>
|
||
|
||
|
||
|
||
<li class="chapter " data-level="8.1" data-path="../appendix/">
|
||
|
||
<a href="../appendix/">
|
||
|
||
|
||
<b>8.1.</b>
|
||
|
||
附录说明
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="8.2" data-path="../appendix/debug-kubernetes-services.html">
|
||
|
||
<a href="../appendix/debug-kubernetes-services.html">
|
||
|
||
|
||
<b>8.2.</b>
|
||
|
||
Kubernetes中的应用故障排查
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="8.3" data-path="../appendix/material-share.html">
|
||
|
||
<a href="../appendix/material-share.html">
|
||
|
||
|
||
<b>8.3.</b>
|
||
|
||
Kubernetes相关资讯和情报链接
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="8.4" data-path="../appendix/docker-best-practice.html">
|
||
|
||
<a href="../appendix/docker-best-practice.html">
|
||
|
||
|
||
<b>8.4.</b>
|
||
|
||
Docker最佳实践
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="8.5" data-path="../appendix/tricks.html">
|
||
|
||
<a href="../appendix/tricks.html">
|
||
|
||
|
||
<b>8.5.</b>
|
||
|
||
使用技巧
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="8.6" data-path="../appendix/issues.html">
|
||
|
||
<a href="../appendix/issues.html">
|
||
|
||
|
||
<b>8.6.</b>
|
||
|
||
问题记录
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="8.7" data-path="../appendix/kubernetes-changelog.html">
|
||
|
||
<a href="../appendix/kubernetes-changelog.html">
|
||
|
||
|
||
<b>8.7.</b>
|
||
|
||
Kubernetes版本更新日志
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="8.7.1" data-path="../appendix/kubernetes-1.7-changelog.html">
|
||
|
||
<a href="../appendix/kubernetes-1.7-changelog.html">
|
||
|
||
|
||
<b>8.7.1.</b>
|
||
|
||
Kubernetes1.7更新日志
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="8.7.2" data-path="../appendix/kubernetes-1.8-changelog.html">
|
||
|
||
<a href="../appendix/kubernetes-1.8-changelog.html">
|
||
|
||
|
||
<b>8.7.2.</b>
|
||
|
||
Kubernetes1.8更新日志
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="8.7.3" data-path="../appendix/kubernetes-1.9-changelog.html">
|
||
|
||
<a href="../appendix/kubernetes-1.9-changelog.html">
|
||
|
||
|
||
<b>8.7.3.</b>
|
||
|
||
Kubernetes1.9更新日志
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
<li class="chapter " data-level="8.8" data-path="../appendix/summary-and-outlook.html">
|
||
|
||
<a href="../appendix/summary-and-outlook.html">
|
||
|
||
|
||
<b>8.8.</b>
|
||
|
||
Kubernetes及云原生年度总结及展望
|
||
|
||
</a>
|
||
|
||
|
||
|
||
<ul class="articles">
|
||
|
||
|
||
<li class="chapter " data-level="8.8.1" data-path="../appendix/kubernetes-and-cloud-native-summary-in-2017-and-outlook-for-2018.html">
|
||
|
||
<a href="../appendix/kubernetes-and-cloud-native-summary-in-2017-and-outlook-for-2018.html">
|
||
|
||
|
||
<b>8.8.1.</b>
|
||
|
||
Kubernetes与云原生2017年年终总结及2018年展望
|
||
|
||
</a>
|
||
|
||
|
||
|
||
</li>
|
||
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
|
||
|
||
|
||
<li class="divider"></li>
|
||
|
||
<li>
|
||
<a href="https://www.gitbook.com" target="blank" class="gitbook-link">
|
||
本书使用 GitBook 发布
|
||
</a>
|
||
</li>
|
||
</ul>
|
||
|
||
|
||
</nav>
|
||
|
||
|
||
</div>
|
||
|
||
<div class="book-body">
|
||
|
||
<div class="body-inner">
|
||
|
||
|
||
|
||
<div class="book-header" role="navigation">
|
||
|
||
|
||
<!-- Title -->
|
||
<h1>
|
||
<i class="fa fa-circle-o-notch fa-spin"></i>
|
||
<a href=".." >Service</a>
|
||
</h1>
|
||
</div>
|
||
|
||
|
||
|
||
|
||
<div class="page-wrapper" tabindex="-1" role="main">
|
||
<div class="page-inner">
|
||
|
||
<div class="search-plus" id="book-search-results">
|
||
<div class="search-noresults">
|
||
|
||
<section class="normal markdown-section">
|
||
|
||
<h1 id="service">Service</h1>
|
||
<p>Kubernetes <a href="https://kubernetes.io/docs/user-guide/pods" target="_blank"><code>Pod</code></a> 是有生命周期的，它们可以被创建，也可以被销毁，然而一旦被销毁生命就永远结束。
|
||
通过 <a href="https://kubernetes.io/docs/user-guide/replication-controller" target="_blank"><code>ReplicationController</code></a> 能够动态地创建和销毁 <code>Pod</code>（例如，需要进行扩缩容，或者执行 <a href="https://kubernetes.io/docs/user-guide/kubectl/v1.7/#rolling-update" target="_blank">滚动升级</a>）。
|
||
每个 <code>Pod</code> 都会获取它自己的 IP 地址，即使这些 IP 地址不总是稳定可依赖的。
|
||
这会导致一个问题：在 Kubernetes 集群中，如果一组 <code>Pod</code>（称为 backend）为其它 <code>Pod</code> （称为 frontend）提供服务，那么那些 frontend 该如何发现，并连接到这组 <code>Pod</code> 中的哪些 backend 呢？</p>
|
||
<p>关于 <code>Service</code></p>
|
||
<p>Kubernetes <code>Service</code> 定义了这样一种抽象：一个 <code>Pod</code> 的逻辑分组，一种可以访问它们的策略 —— 通常称为微服务。
|
||
这一组 <code>Pod</code> 能够被 <code>Service</code> 访问到，通常是通过 <a href="https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#label-selectors" target="_blank"><code>Label Selector</code></a>（查看下面了解，为什么可能需要没有 selector 的 <code>Service</code>）实现的。</p>
|
||
<p>举个例子，考虑一个图片处理 backend，它运行了3个副本。这些副本是可互换的 —— frontend 不需要关心它们调用了哪个 backend 副本。
|
||
然而组成这一组 backend 程序的 <code>Pod</code> 实际上可能会发生变化，frontend 客户端不应该也没必要知道，而且也不需要跟踪这一组 backend 的状态。
|
||
<code>Service</code> 定义的抽象能够解耦这种关联。</p>
|
||
<p>对 Kubernetes 集群中的应用，Kubernetes 提供了简单的 <code>Endpoints</code> API，只要 <code>Service</code> 中的一组 <code>Pod</code> 发生变更，应用程序就会被更新。
|
||
对非 Kubernetes 集群中的应用，Kubernetes 提供了基于 VIP 的网桥的方式访问 <code>Service</code>，再由 <code>Service</code> 重定向到 backend <code>Pod</code>。</p>
|
||
<h2 id="定义-service">定义 Service</h2>
|
||
<p>一个 <code>Service</code> 在 Kubernetes 中是一个 REST 对象，和 <code>Pod</code> 类似。
|
||
像所有的 REST 对象一样， <code>Service</code> 定义可以基于 POST 方式，请求 apiserver 创建新的实例。
|
||
例如，假定有一组 <code>Pod</code>，它们对外暴露了 9376 端口，同时还被打上 <code>"app=MyApp"</code> 标签。</p>
|
||
<pre><code class="lang-yaml"><span class="hljs-attr">kind:</span> Service
|
||
<span class="hljs-attr">apiVersion:</span> v1
|
||
<span class="hljs-attr">metadata:</span>
|
||
<span class="hljs-attr"> name:</span> my-service
|
||
<span class="hljs-attr">spec:</span>
|
||
<span class="hljs-attr"> selector:</span>
|
||
<span class="hljs-attr"> app:</span> MyApp
|
||
<span class="hljs-attr"> ports:</span>
|
||
<span class="hljs-attr"> - protocol:</span> TCP
|
||
<span class="hljs-attr"> port:</span> <span class="hljs-number">80</span>
|
||
<span class="hljs-attr"> targetPort:</span> <span class="hljs-number">9376</span>
|
||
</code></pre>
|
||
<p>上述配置将创建一个名称为 “my-service” 的 <code>Service</code> 对象，它会将请求代理到使用 TCP 端口 9376，并且具有标签 <code>"app=MyApp"</code> 的 <code>Pod</code> 上。
|
||
这个 <code>Service</code> 将被指派一个 IP 地址（通常称为 “Cluster IP”），它会被服务的代理使用（见下面）。
|
||
该 <code>Service</code> 的 selector 将会持续评估，处理结果将被 POST 到一个名称为 “my-service” 的 <code>Endpoints</code> 对象上。</p>
|
||
<p>需要注意的是， <code>Service</code> 能够将一个接收端口映射到任意的 <code>targetPort</code>。
|
||
默认情况下，<code>targetPort</code> 将被设置为与 <code>port</code> 字段相同的值。
|
||
可能更有趣的是，<code>targetPort</code> 可以是一个字符串，引用了 backend <code>Pod</code> 的一个端口的名称。
|
||
但是，实际指派给该端口名称的端口号，在每个 backend <code>Pod</code> 中可能并不相同。
|
||
对于部署和设计 <code>Service</code> ，这种方式会提供更大的灵活性。
|
||
例如，可以在 backend 软件下一个版本中，修改 Pod 暴露的端口，并不会中断客户端的调用。</p>
|
||
<p>Kubernetes <code>Service</code> 能够支持 <code>TCP</code> 和 <code>UDP</code> 协议，默认 <code>TCP</code> 协议。 </p>
|
||
<h3 id="没有-selector-的-service">没有 selector 的 Service</h3>
|
||
<p>Service 抽象了该如何访问 Kubernetes <code>Pod</code>，但也能够抽象其它类型的 backend，例如：</p>
|
||
<ul>
|
||
<li>希望在生产环境中使用外部的数据库集群，但测试环境使用自己的数据库。</li>
|
||
<li>希望服务指向另一个 <a href="https://kubernetes.io/docs/user-guide/namespaces" target="_blank"><code>Namespace</code></a> 中或其它集群中的服务。</li>
|
||
<li>正在将工作负载转移到 Kubernetes 集群，和运行在 Kubernetes 集群之外的 backend。</li>
|
||
</ul>
|
||
<p>在任何这些场景中，都能够定义没有 selector 的 <code>Service</code> ：</p>
|
||
<pre><code class="lang-yaml"><span class="hljs-attr">kind:</span> Service
|
||
<span class="hljs-attr">apiVersion:</span> v1
|
||
<span class="hljs-attr">metadata:</span>
|
||
<span class="hljs-attr"> name:</span> my-service
|
||
<span class="hljs-attr">spec:</span>
|
||
<span class="hljs-attr"> ports:</span>
|
||
<span class="hljs-attr"> - protocol:</span> TCP
|
||
<span class="hljs-attr"> port:</span> <span class="hljs-number">80</span>
|
||
<span class="hljs-attr"> targetPort:</span> <span class="hljs-number">9376</span>
|
||
</code></pre>
|
||
<p>由于这个 <code>Service</code> 没有 selector，就不会创建相关的 <code>Endpoints</code> 对象。可以手动将 <code>Service</code> 映射到指定的 <code>Endpoints</code>：</p>
|
||
<pre><code class="lang-yaml"><span class="hljs-attr">kind:</span> Endpoints
|
||
<span class="hljs-attr">apiVersion:</span> v1
|
||
<span class="hljs-attr">metadata:</span>
|
||
<span class="hljs-attr"> name:</span> my-service
|
||
<span class="hljs-attr">subsets:</span>
|
||
<span class="hljs-attr"> - addresses:</span>
|
||
<span class="hljs-attr"> - ip:</span> <span class="hljs-number">1.2</span><span class="hljs-number">.3</span><span class="hljs-number">.4</span>
|
||
<span class="hljs-attr"> ports:</span>
|
||
<span class="hljs-attr"> - port:</span> <span class="hljs-number">9376</span>
|
||
</code></pre>
|
||
<p>注意：Endpoint IP 地址不能是 loopback（127.0.0.0/8）、 link-local（169.254.0.0/16）、或者 link-local 多播（224.0.0.0/24）。</p>
|
||
<p>访问没有 selector 的 <code>Service</code>，与有 selector 的 <code>Service</code> 的原理相同。请求将被路由到用户定义的 Endpoint（该示例中为 <code>1.2.3.4:9376</code>）。</p>
|
||
<p>ExternalName <code>Service</code> 是 <code>Service</code> 的特例，它没有 selector，也没有定义任何的端口和 Endpoint。
|
||
相反地，对于运行在集群外部的服务，它通过返回该外部服务的别名这种方式来提供服务。</p>
|
||
<pre><code class="lang-yaml"><span class="hljs-attr">kind:</span> Service
|
||
<span class="hljs-attr">apiVersion:</span> v1
|
||
<span class="hljs-attr">metadata:</span>
|
||
<span class="hljs-attr"> name:</span> my-service
|
||
<span class="hljs-attr"> namespace:</span> prod
|
||
<span class="hljs-attr">spec:</span>
|
||
<span class="hljs-attr"> type:</span> ExternalName
|
||
<span class="hljs-attr"> externalName:</span> my.database.example.com
|
||
</code></pre>
|
||
<p>当查询主机 <code>my-service.prod.svc.CLUSTER</code>时，集群的 DNS 服务将返回一个值为 <code>my.database.example.com</code> 的 <code>CNAME</code> 记录。
|
||
访问这个服务的工作方式与其它的相同，唯一不同的是重定向发生在 DNS 层，而且不会进行代理或转发。
|
||
如果后续决定要将数据库迁移到 Kubernetes 集群中，可以启动对应的 Pod，增加合适的 Selector 或 Endpoint，修改 <code>Service</code> 的 <code>type</code>。</p>
|
||
<h2 id="vip-和-service-代理">VIP 和 Service 代理</h2>
|
||
<p>在 Kubernetes 集群中，每个 Node 运行一个 <code>kube-proxy</code> 进程。<code>kube-proxy</code> 负责为 <code>Service</code> 实现了一种 VIP（虚拟 IP）的形式，而不是 <code>ExternalName</code> 的形式。
|
||
在 Kubernetes v1.0 版本，代理完全在 userspace。在 Kubernetes v1.1 版本，新增了 iptables 代理，但并不是默认的运行模式。
|
||
从 Kubernetes v1.2 起，默认就是 iptables 代理。</p>
|
||
<p>在 Kubernetes v1.0 版本，<code>Service</code> 是 “4层”（TCP/UDP over IP）概念。
|
||
在 Kubernetes v1.1 版本，新增了 <code>Ingress</code> API（beta 版），用来表示 “7层”（HTTP）服务。</p>
|
||
<h3 id="userspace-代理模式">userspace 代理模式</h3>
|
||
<p>这种模式，kube-proxy 会监视 Kubernetes master 对 <code>Service</code> 对象和 <code>Endpoints</code> 对象的添加和移除。
|
||
对每个 <code>Service</code>，它会在本地 Node 上打开一个端口（随机选择）。
|
||
任何连接到“代理端口”的请求，都会被代理到 <code>Service</code> 的backend <code>Pods</code> 中的某个上面（如 <code>Endpoints</code> 所报告的一样）。
|
||
使用哪个 backend <code>Pod</code>，是基于 <code>Service</code> 的 <code>SessionAffinity</code> 来确定的。
|
||
最后，它安装 iptables 规则，捕获到达该 <code>Service</code> 的 <code>clusterIP</code>（是虚拟 IP）和 <code>Port</code> 的请求，并重定向到代理端口，代理端口再代理请求到 backend <code>Pod</code>。</p>
|
||
<p>网络返回的结果是，任何到达 <code>Service</code> 的 IP:Port 的请求，都会被代理到一个合适的 backend，不需要客户端知道关于 Kubernetes、<code>Service</code>、或 <code>Pod</code> 的任何信息。</p>
|
||
<p>默认的策略是，通过 round-robin 算法来选择 backend <code>Pod</code>。
|
||
实现基于客户端 IP 的会话亲和性，可以通过设置 <code>service.spec.sessionAffinity</code> 的值为 <code>"ClientIP"</code> （默认值为 <code>"None"</code>）。</p>
|
||
<figure id="fig3.2.4.1.1"><img src="../images/services-userspace-overview.jpg" alt="userspace代理模式下Service概览图"><figcaption>图片 - userspace代理模式下Service概览图</figcaption></figure>
|
||
<h3 id="iptables-代理模式">iptables 代理模式</h3>
|
||
<p>这种模式，kube-proxy 会监视 Kubernetes master 对 <code>Service</code> 对象和 <code>Endpoints</code> 对象的添加和移除。
|
||
对每个 <code>Service</code>，它会安装 iptables 规则，从而捕获到达该 <code>Service</code> 的 <code>clusterIP</code>（虚拟 IP）和端口的请求，进而将请求重定向到 <code>Service</code> 的一组 backend 中的某个上面。
|
||
对于每个 <code>Endpoints</code> 对象，它也会安装 iptables 规则，这个规则会选择一个 backend <code>Pod</code>。</p>
|
||
<p>默认的策略是，随机选择一个 backend。
|
||
实现基于客户端 IP 的会话亲和性，可以将 <code>service.spec.sessionAffinity</code> 的值设置为 <code>"ClientIP"</code> （默认值为 <code>"None"</code>）。</p>
|
||
<p>和 userspace 代理类似，网络返回的结果是，任何到达 <code>Service</code> 的 IP:Port 的请求，都会被代理到一个合适的 backend，不需要客户端知道关于 Kubernetes、<code>Service</code>、或 <code>Pod</code> 的任何信息。
|
||
这应该比 userspace 代理更快、更可靠。然而，不像 userspace 代理，如果初始选择的 <code>Pod</code> 没有响应，iptables 代理不能自动地重试另一个 <code>Pod</code>，所以它需要依赖 <a href="https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-probes/#defining-readiness-probes" target="_blank">readiness probes</a>。</p>
|
||
<figure id="fig3.2.4.1.2"><img src="../images/services-iptables-overview.jpg" alt="iptables代理模式下Service概览图"><figcaption>图片 - iptables代理模式下Service概览图</figcaption></figure>
|
||
<h2 id="多端口-service">多端口 Service</h2>
|
||
<p>很多 <code>Service</code> 需要暴露多个端口。对于这种情况，Kubernetes 支持在 <code>Service</code> 对象中定义多个端口。
|
||
当使用多个端口时，必须给出所有的端口的名称，这样 Endpoint 就不会产生歧义，例如：</p>
|
||
<pre><code class="lang-yaml"><span class="hljs-attr">kind:</span> Service
|
||
<span class="hljs-attr">apiVersion:</span> v1
|
||
<span class="hljs-attr">metadata:</span>
|
||
<span class="hljs-attr"> name:</span> my-service
|
||
<span class="hljs-attr">spec:</span>
|
||
<span class="hljs-attr"> selector:</span>
|
||
<span class="hljs-attr"> app:</span> MyApp
|
||
<span class="hljs-attr"> ports:</span>
|
||
<span class="hljs-attr"> - name:</span> http
|
||
<span class="hljs-attr"> protocol:</span> TCP
|
||
<span class="hljs-attr"> port:</span> <span class="hljs-number">80</span>
|
||
<span class="hljs-attr"> targetPort:</span> <span class="hljs-number">9376</span>
|
||
<span class="hljs-attr"> - name:</span> https
|
||
<span class="hljs-attr"> protocol:</span> TCP
|
||
<span class="hljs-attr"> port:</span> <span class="hljs-number">443</span>
|
||
<span class="hljs-attr"> targetPort:</span> <span class="hljs-number">9377</span>
|
||
</code></pre>
|
||
<h2 id="选择自己的-ip-地址">选择自己的 IP 地址</h2>
|
||
<p>在 <code>Service</code> 创建的请求中，可以通过设置 <code>spec.clusterIP</code> 字段来指定自己的集群 IP 地址。
|
||
比如，希望替换一个已经已存在的 DNS 条目，或者遗留系统已经配置了一个固定的 IP 且很难重新配置。
|
||
用户选择的 IP 地址必须合法，并且这个 IP 地址在 <code>service-cluster-ip-range</code> CIDR 范围内，这对 API Server 来说是通过一个标识来指定的。
|
||
如果 IP 地址不合法，API Server 会返回 HTTP 状态码 422，表示值不合法。</p>
|
||
<h3 id="为何不使用-round-robin-dns？">为何不使用 round-robin DNS？</h3>
|
||
<p>一个不时出现的问题是，为什么我们都使用 VIP 的方式，而不使用标准的 round-robin DNS，有如下几个原因：</p>
|
||
<ul>
|
||
<li>长久以来，DNS 库都没能认真对待 DNS TTL、缓存域名查询结果</li>
|
||
<li>很多应用只查询一次 DNS 并缓存了结果<ul>
|
||
<li>就算应用和库能够正确查询解析，每个客户端反复重解析造成的负载也是非常难以管理的</li>
|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
<p>我们尽力阻止用户做那些对他们没有好处的事情，如果很多人都来问这个问题，我们可能会选择实现它。</p>
|
||
<h2 id="服务发现">服务发现</h2>
|
||
<p>Kubernetes 支持2种基本的服务发现模式 —— 环境变量和 DNS。</p>
|
||
<h3 id="环境变量">环境变量</h3>
|
||
<p>当 <code>Pod</code> 运行在 <code>Node</code> 上，kubelet 会为每个活跃的 <code>Service</code> 添加一组环境变量。
|
||
它同时支持 <a href="https://docs.docker.com/userguide/dockerlinks/" target="_blank">Docker links 兼容</a> 变量（查看 <a href="http://releases.k8s.io//pkg/kubelet/envvars/envvars.go#L49" target="_blank">makeLinkVariables</a>）、简单的 <code>{SVCNAME}_SERVICE_HOST</code> 和 <code>{SVCNAME}_SERVICE_PORT</code> 变量，这里 <code>Service</code> 的名称需大写，横线被转换成下划线。</p>
|
||
<p>举个例子，一个名称为 <code>"redis-master"</code> 的 Service 暴露了 TCP 端口 6379，同时给它分配了 Cluster IP 地址 10.0.0.11，这个 Service 生成了如下环境变量：</p>
|
||
<pre><code class="lang-shell">REDIS_MASTER_SERVICE_HOST=10.0.0.11
|
||
REDIS_MASTER_SERVICE_PORT=6379
|
||
REDIS_MASTER_PORT=tcp://10.0.0.11:6379
|
||
REDIS_MASTER_PORT_6379_TCP=tcp://10.0.0.11:6379
|
||
REDIS_MASTER_PORT_6379_TCP_PROTO=tcp
|
||
REDIS_MASTER_PORT_6379_TCP_PORT=6379
|
||
REDIS_MASTER_PORT_6379_TCP_ADDR=10.0.0.11
|
||
</code></pre>
|
||
<p><em>这意味着需要有顺序的要求</em> —— <code>Pod</code> 想要访问的任何 <code>Service</code> 必须在 <code>Pod</code> 自己之前被创建，否则这些环境变量就不会被赋值。DNS 并没有这个限制。</p>
|
||
<h3 id="dns">DNS</h3>
|
||
<p>一个可选（尽管强烈推荐）<a href="http://releases.k8s.io/master/cluster/addons/README.md" target="_blank">集群插件</a> 是 DNS 服务器。
|
||
DNS 服务器监视着创建新 <code>Service</code> 的 Kubernetes API，从而为每一个 <code>Service</code> 创建一组 DNS 记录。
|
||
如果整个集群的 DNS 一直被启用，那么所有的 <code>Pod</code> 应该能够自动对 <code>Service</code> 进行名称解析。</p>
|
||
<p>例如，有一个名称为 <code>"my-service"</code> 的 <code>Service</code>，它在 Kubernetes 集群中名为 <code>"my-ns"</code> 的 <code>Namespace</code> 中，为 <code>"my-service.my-ns"</code> 创建了一条 DNS 记录。
|
||
在名称为 <code>"my-ns"</code> 的 <code>Namespace</code> 中的 <code>Pod</code> 应该能够简单地通过名称查询找到 <code>"my-service"</code>。
|
||
在另一个 <code>Namespace</code> 中的 <code>Pod</code> 必须限定名称为 <code>"my-service.my-ns"</code>。
|
||
这些名称查询的结果是 Cluster IP。</p>
|
||
<p>Kubernetes 也支持对端口名称的 DNS SRV（Service）记录。
|
||
如果名称为 <code>"my-service.my-ns"</code> 的 <code>Service</code> 有一个名为 <code>"http"</code> 的 <code>TCP</code> 端口，可以对 <code>"_http._tcp.my-service.my-ns"</code> 执行 DNS SRV 查询，得到 <code>"http"</code> 的端口号。</p>
|
||
<p>Kubernetes DNS 服务器是唯一的一种能够访问 <code>ExternalName</code> 类型的 Service 的方式。
|
||
更多信息可以查看 <a href="https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/" target="_blank">DNS Pod 和 Service</a>。</p>
|
||
<h2 id="headless-service">Headless Service</h2>
|
||
<p>有时不需要或不想要负载均衡，以及单独的 Service IP。
|
||
遇到这种情况，可以通过指定 Cluster IP（<code>spec.clusterIP</code>）的值为 <code>"None"</code> 来创建 <code>Headless</code> Service。</p>
|
||
<p>这个选项允许开发人员自由寻找他们自己的方式，从而降低与 Kubernetes 系统的耦合性。
|
||
应用仍然可以使用一种自注册的模式和适配器，对其它需要发现机制的系统能够很容易地基于这个 API 来构建。</p>
|
||
<p>对这类 <code>Service</code> 并不会分配 Cluster IP，kube-proxy 不会处理它们，而且平台也不会为它们进行负载均衡和路由。
|
||
DNS 如何实现自动配置，依赖于 <code>Service</code> 是否定义了 selector。</p>
|
||
<h3 id="配置-selector">配置 Selector</h3>
|
||
<p>对定义了 selector 的 Headless Service，Endpoint 控制器在 API 中创建了 <code>Endpoints</code> 记录，并且修改 DNS 配置返回 A 记录（地址），通过这个地址直接到达 <code>Service</code> 的后端 <code>Pod</code> 上。</p>
|
||
<h3 id="不配置-selector">不配置 Selector</h3>
|
||
<p>对没有定义 selector 的 Headless Service，Endpoint 控制器不会创建 <code>Endpoints</code> 记录。
|
||
然而 DNS 系统会查找和配置，无论是：</p>
|
||
<ul>
|
||
<li><code>ExternalName</code> 类型 Service 的 CNAME 记录<ul>
|
||
<li>记录：与 Service 共享一个名称的任何 <code>Endpoints</code>，以及所有其它类型</li>
|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
<h2 id="发布服务-——-服务类型">发布服务 —— 服务类型</h2>
|
||
<p>对一些应用（如 Frontend）的某些部分，可能希望通过外部（Kubernetes 集群外部）IP 地址暴露 Service。</p>
|
||
<p>Kubernetes <code>ServiceTypes</code> 允许指定一个需要的类型的 Service，默认是 <code>ClusterIP</code> 类型。</p>
|
||
<p><code>Type</code> 的取值以及行为如下：</p>
|
||
<ul>
|
||
<li><code>ClusterIP</code>：通过集群的内部 IP 暴露服务，选择该值，服务只能够在集群内部可以访问，这也是默认的 <code>ServiceType</code>。</li>
|
||
<li><code>NodePort</code>：通过每个 Node 上的 IP 和静态端口（<code>NodePort</code>）暴露服务。<code>NodePort</code> 服务会路由到 <code>ClusterIP</code> 服务，这个 <code>ClusterIP</code> 服务会自动创建。通过请求 <code><NodeIP>:<NodePort></code>，可以从集群的外部访问一个 <code>NodePort</code> 服务。</li>
|
||
<li><code>LoadBalancer</code>：使用云提供商的负载均衡器，可以向外部暴露服务。外部的负载均衡器可以路由到 <code>NodePort</code> 服务和 <code>ClusterIP</code> 服务。</li>
|
||
<li><code>ExternalName</code>：通过返回 <code>CNAME</code> 和它的值，可以将服务映射到 <code>externalName</code> 字段的内容（例如， <code>foo.bar.example.com</code>）。
|
||
没有任何类型代理被创建，这只有 Kubernetes 1.7 或更高版本的 <code>kube-dns</code> 才支持。</li>
|
||
</ul>
|
||
<h3 id="nodeport-类型">NodePort 类型</h3>
|
||
<p>如果设置 <code>type</code> 的值为 <code>"NodePort"</code>，Kubernetes master 将从给定的配置范围内（默认：30000-32767）分配端口，每个 Node 将从该端口（每个 Node 上的同一端口）代理到 <code>Service</code>。该端口将通过 <code>Service</code> 的 <code>spec.ports[*].nodePort</code> 字段被指定。</p>
|
||
<p>如果需要指定的端口号，可以配置 <code>nodePort</code> 的值，系统将分配这个端口，否则调用 API 将会失败（比如，需要关心端口冲突的可能性）。 </p>
|
||
<p>这可以让开发人员自由地安装他们自己的负载均衡器，并配置 Kubernetes 不能完全支持的环境参数，或者直接暴露一个或多个 Node 的 IP 地址。</p>
|
||
<p>需要注意的是，Service 将能够通过 <code><NodeIP>:spec.ports[*].nodePort</code> 和 <code>spec.clusterIp:spec.ports[*].port</code> 而对外可见。</p>
|
||
<h3 id="loadbalancer-类型">LoadBalancer 类型</h3>
|
||
<p>使用支持外部负载均衡器的云提供商的服务，设置 <code>type</code> 的值为 <code>"LoadBalancer"</code>，将为 <code>Service</code> 提供负载均衡器。
|
||
负载均衡器是异步创建的，关于被提供的负载均衡器的信息将会通过 <code>Service</code> 的 <code>status.loadBalancer</code> 字段被发布出去。</p>
|
||
<pre><code class="lang-yaml"><span class="hljs-attr">kind:</span> Service
|
||
<span class="hljs-attr">apiVersion:</span> v1
|
||
<span class="hljs-attr">metadata:</span>
|
||
<span class="hljs-attr"> name:</span> my-service
|
||
<span class="hljs-attr">spec:</span>
|
||
<span class="hljs-attr"> selector:</span>
|
||
<span class="hljs-attr"> app:</span> MyApp
|
||
<span class="hljs-attr"> ports:</span>
|
||
<span class="hljs-attr"> - protocol:</span> TCP
|
||
<span class="hljs-attr"> port:</span> <span class="hljs-number">80</span>
|
||
<span class="hljs-attr"> targetPort:</span> <span class="hljs-number">9376</span>
|
||
<span class="hljs-attr"> nodePort:</span> <span class="hljs-number">30061</span>
|
||
<span class="hljs-attr"> clusterIP:</span> <span class="hljs-number">10.0</span><span class="hljs-number">.171</span><span class="hljs-number">.239</span>
|
||
<span class="hljs-attr"> loadBalancerIP:</span> <span class="hljs-number">78.11</span><span class="hljs-number">.24</span><span class="hljs-number">.19</span>
|
||
<span class="hljs-attr"> type:</span> LoadBalancer
|
||
<span class="hljs-attr">status:</span>
|
||
<span class="hljs-attr"> loadBalancer:</span>
|
||
<span class="hljs-attr"> ingress:</span>
|
||
<span class="hljs-attr"> - ip:</span> <span class="hljs-number">146.148</span><span class="hljs-number">.47</span><span class="hljs-number">.155</span>
|
||
</code></pre>
|
||
<p>来自外部负载均衡器的流量将直接打到 backend <code>Pod</code> 上，不过实际它们是如何工作的，这要依赖于云提供商。
|
||
在这些情况下，将根据用户设置的 <code>loadBalancerIP</code> 来创建负载均衡器。
|
||
某些云提供商允许设置 <code>loadBalancerIP</code>。如果没有设置 <code>loadBalancerIP</code>，将会给负载均衡器指派一个临时 IP。
|
||
如果设置了 <code>loadBalancerIP</code>，但云提供商并不支持这种特性，那么设置的 <code>loadBalancerIP</code> 值将会被忽略掉。</p>
|
||
<h3 id="aws-内部负载均衡器">AWS 内部负载均衡器</h3>
|
||
<p>在混合云环境中，有时从虚拟私有云（VPC）环境中的服务路由流量是非常有必要的。
|
||
可以通过在 <code>Service</code> 中增加 <code>annotation</code> 来实现，如下所示：</p>
|
||
<pre><code class="lang-yaml">[...]
|
||
<span class="hljs-attr">metadata:</span>
|
||
<span class="hljs-attr"> name:</span> my-service
|
||
<span class="hljs-attr"> annotations:</span>
|
||
service.beta.kubernetes.io/aws-load-balancer-internal: <span class="hljs-number">0.0</span><span class="hljs-number">.0</span><span class="hljs-number">.0</span>/<span class="hljs-number">0</span>
|
||
[...]
|
||
</code></pre>
|
||
<p>在水平分割的 DNS 环境中，需要两个 <code>Service</code> 来将外部和内部的流量路由到 Endpoint 上。</p>
|
||
<h3 id="aws-ssl-支持">AWS SSL 支持</h3>
|
||
<p>对运行在 AWS 上部分支持 SSL 的集群，从 1.3 版本开始，可以为 <code>LoadBalancer</code> 类型的 <code>Service</code> 增加两个 annotation：</p>
|
||
<pre><code> metadata:
|
||
name: my-service
|
||
annotations:
|
||
service.beta.kubernetes.io/aws-load-balancer-ssl-cert: arn:aws:acm:us-east-1:123456789012:certificate/12345678-1234-1234-1234-123456789012
|
||
</code></pre><p>第一个 annotation 指定了使用的证书。它可以是第三方发行商发行的证书，这个证书或者被上传到 IAM，或者由 AWS 的证书管理器创建。</p>
|
||
<pre><code class="lang-yaml"><span class="hljs-attr"> metadata:</span>
|
||
<span class="hljs-attr"> name:</span> my-service
|
||
<span class="hljs-attr"> annotations:</span>
|
||
service.beta.kubernetes.io/aws-load-balancer-backend-protocol: (https|http|ssl|tcp)
|
||
</code></pre>
|
||
<p>第二个 annotation 指定了 <code>Pod</code> 使用的协议。
|
||
对于 HTTPS 和 SSL，ELB 将期望该 <code>Pod</code> 基于加密的连接来认证自身。</p>
|
||
<p>HTTP 和 HTTPS 将选择7层代理：ELB 将中断与用户的连接，当转发请求时，会解析 Header 信息并添加上用户的 IP 地址（<code>Pod</code> 将只能在连接的另一端看到该 IP 地址）。</p>
|
||
<p>TCP 和 SSL 将选择4层代理：ELB 将转发流量，并不修改 Header 信息。</p>
|
||
<h3 id="外部-ip">外部 IP</h3>
|
||
<p>如果外部的 IP 路由到集群中一个或多个 Node 上，Kubernetes <code>Service</code> 会被暴露给这些 <code>externalIPs</code>。
|
||
通过外部 IP（作为目的 IP 地址）进入到集群，打到 <code>Service</code> 的端口上的流量，将会被路由到 <code>Service</code> 的 Endpoint 上。
|
||
<code>externalIPs</code> 不会被 Kubernetes 管理，它属于集群管理员的职责范畴。</p>
|
||
<p>根据 <code>Service</code> 的规定，<code>externalIPs</code> 可以同任意的 <code>ServiceType</code> 来一起指定。
|
||
在下面的例子中，<code>my-service</code> 可以在 80.11.12.10:80（外部 IP:端口）上被客户端访问。</p>
|
||
<pre><code class="lang-yaml"><span class="hljs-attr">kind:</span> Service
|
||
<span class="hljs-attr">apiVersion:</span> v1
|
||
<span class="hljs-attr">metadata:</span>
|
||
<span class="hljs-attr"> name:</span> my-service
|
||
<span class="hljs-attr">spec:</span>
|
||
<span class="hljs-attr"> selector:</span>
|
||
<span class="hljs-attr"> app:</span> MyApp
|
||
<span class="hljs-attr"> ports:</span>
|
||
<span class="hljs-attr"> - name:</span> http
|
||
<span class="hljs-attr"> protocol:</span> TCP
|
||
<span class="hljs-attr"> port:</span> <span class="hljs-number">80</span>
|
||
<span class="hljs-attr"> targetPort:</span> <span class="hljs-number">9376</span>
|
||
<span class="hljs-attr"> externalIPs:</span>
|
||
<span class="hljs-bullet"> -</span> <span class="hljs-number">80.11</span><span class="hljs-number">.12</span><span class="hljs-number">.10</span>
|
||
</code></pre>
|
||
<h2 id="不足之处">不足之处</h2>
|
||
<p>为 VIP 使用 userspace 代理，将只适合小型到中型规模的集群，不能够扩展到上千 <code>Service</code> 的大型集群。
|
||
查看 <a href="http://issue.k8s.io/1107" target="_blank">最初设计方案</a> 获取更多细节。</p>
|
||
<p>使用 userspace 代理，隐藏了访问 <code>Service</code> 的数据包的源 IP 地址。
|
||
这使得一些类型的防火墙无法起作用。
|
||
iptables 代理不会隐藏 Kubernetes 集群内部的 IP 地址，但却要求客户端请求必须通过一个负载均衡器或 Node 端口。</p>
|
||
<p><code>Type</code> 字段支持嵌套功能 —— 每一层需要添加到上一层里面。
|
||
不会严格要求所有云提供商（例如，GCE 就没必要为了使一个 <code>LoadBalancer</code> 能工作而分配一个 <code>NodePort</code>，但是 AWS 需要 ），但当前 API 是强制要求的。</p>
|
||
<h2 id="未来工作">未来工作</h2>
|
||
<p>未来我们能预见到，代理策略可能会变得比简单的 round-robin 均衡策略有更多细微的差别，比如 master 选举或分片。
|
||
我们也能想到，某些 <code>Service</code> 将具有 “真正” 的负载均衡器，这种情况下 VIP 将简化数据包的传输。</p>
|
||
<p>我们打算为 L7（HTTP）<code>Service</code> 改进我们对它的支持。</p>
|
||
<p>我们打算为 <code>Service</code> 实现更加灵活的请求进入模式，这些 <code>Service</code> 包含当前 <code>ClusterIP</code>、<code>NodePort</code> 和 <code>LoadBalancer</code> 模式，或者更多。</p>
|
||
<h2 id="vip-的那些骇人听闻的细节">VIP 的那些骇人听闻的细节</h2>
|
||
<p>对很多想使用 <code>Service</code> 的人来说，前面的信息应该足够了。
|
||
然而，有很多内部原理性的内容，还是值去理解的。</p>
|
||
<h3 id="避免冲突">避免冲突</h3>
|
||
<p>Kubernetes 最主要的哲学之一，是用户不应该暴露那些能够导致他们操作失败、但又不是他们的过错的场景。
|
||
这种场景下，让我们来看一下网络端口 —— 用户不应该必须选择一个端口号，而且该端口还有可能与其他用户的冲突。
|
||
这就是说，在彼此隔离状态下仍然会出现失败。</p>
|
||
<p>为了使用户能够为他们的 <code>Service</code> 选择一个端口号，我们必须确保不能有2个 <code>Service</code> 发生冲突。
|
||
我们可以通过为每个 <code>Service</code> 分配它们自己的 IP 地址来实现。</p>
|
||
<p>为了保证每个 <code>Service</code> 被分配到一个唯一的 IP，需要一个内部的分配器能够原子地更新 etcd 中的一个全局分配映射表，这个更新操作要先于创建每一个 <code>Service</code>。
|
||
为了使 <code>Service</code> 能够获取到 IP，这个映射表对象必须在注册中心存在，否则创建 <code>Service</code> 将会失败，指示一个 IP 不能被分配。
|
||
一个后台 Controller 的职责是创建映射表（从 Kubernetes 的旧版本迁移过来，旧版本中是通过在内存中加锁的方式实现），并检查由于管理员干预和清除任意 IP 造成的不合理分配，这些 IP 被分配了但当前没有 <code>Service</code> 使用它们。</p>
|
||
<h3 id="ip-和-vip">IP 和 VIP</h3>
|
||
<p>不像 <code>Pod</code> 的 IP 地址，它实际路由到一个固定的目的地，<code>Service</code> 的 IP 实际上不能通过单个主机来进行应答。
|
||
相反，我们使用 <code>iptables</code>（Linux 中的数据包处理逻辑）来定义一个虚拟IP地址（VIP），它可以根据需要透明地进行重定向。
|
||
当客户端连接到 VIP 时，它们的流量会自动地传输到一个合适的 Endpoint。
|
||
环境变量和 DNS，实际上会根据 <code>Service</code> 的 VIP 和端口来进行填充。</p>
|
||
<h4 id="userspace">Userspace</h4>
|
||
<p>作为一个例子，考虑前面提到的图片处理应用程序。
|
||
当创建 backend <code>Service</code> 时，Kubernetes master 会给它指派一个虚拟 IP 地址，比如 10.0.0.1。
|
||
假设 <code>Service</code> 的端口是 1234，该 <code>Service</code> 会被集群中所有的 <code>kube-proxy</code> 实例观察到。
|
||
当代理看到一个新的 <code>Service</code>， 它会打开一个新的端口，建立一个从该 VIP 重定向到新端口的 iptables，并开始接收请求连接。</p>
|
||
<p>当一个客户端连接到一个 VIP，iptables 规则开始起作用，它会重定向该数据包到 <code>Service代理</code> 的端口。
|
||
<code>Service代理</code> 选择一个 backend，并将客户端的流量代理到 backend 上。</p>
|
||
<p>这意味着 <code>Service</code> 的所有者能够选择任何他们想使用的端口，而不存在冲突的风险。
|
||
客户端可以简单地连接到一个 IP 和端口，而不需要知道实际访问了哪些 <code>Pod</code>。</p>
|
||
<h4 id="iptables">Iptables</h4>
|
||
<p>再次考虑前面提到的图片处理应用程序。
|
||
当创建 backend <code>Service</code> 时，Kubernetes master 会给它指派一个虚拟 IP 地址，比如 10.0.0.1。
|
||
假设 <code>Service</code> 的端口是 1234，该 <code>Service</code> 会被集群中所有的 <code>kube-proxy</code> 实例观察到。
|
||
当代理看到一个新的 <code>Service</code>， 它会安装一系列的 iptables 规则，从 VIP 重定向到 per-<code>Service</code> 规则。
|
||
该 per-<code>Service</code> 规则连接到 per-<code>Endpoint</code> 规则，该 per-<code>Endpoint</code> 规则会重定向（目标 NAT）到 backend。</p>
|
||
<p>当一个客户端连接到一个 VIP，iptables 规则开始起作用。一个 backend 会被选择（或者根据会话亲和性，或者随机），数据包被重定向到这个 backend。
|
||
不像 userspace 代理，数据包从来不拷贝到用户空间，kube-proxy 不是必须为该 VIP 工作而运行，并且客户端 IP 是不可更改的。
|
||
当流量打到 Node 的端口上，或通过负载均衡器，会执行相同的基本流程，但是在那些案例中客户端 IP 是可以更改的。</p>
|
||
<h2 id="api-对象">API 对象</h2>
|
||
<p>在 Kubernetes REST API 中，Service 是 top-level 资源。关于 API 对象的更多细节可以查看：<a href="https://kubernetes.io/docs/api-reference/v1.7/#service-v1-core" target="_blank">Service API 对象</a>。</p>
|
||
<h2 id="更多信息">更多信息</h2>
|
||
<ul>
|
||
<li><a href="https://kubernetes.io/docs/tutorials/connecting-apps/connecting-frontend-backend/" target="_blank">使用 Service 连接 Frontend 到 Backend</a> </li>
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</ul>
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