2017-08-21 17:44:43 +08:00
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<title>4.2.4 边缘节点配置 · Kubernetes Handbook</title>
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<meta name="author" content="Jimmy Song">
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<a href="../">
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1. 前言
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</a>
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<a href="../concepts/">
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2. 概念原理
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</a>
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<li class="chapter " data-level="1.2.1" data-path="../concepts/concepts.html">
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<a href="../concepts/concepts.html">
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2.1 设计理念
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</a>
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</li>
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<li class="chapter " data-level="1.2.2" data-path="../concepts/objects.html">
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<a href="../concepts/objects.html">
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2017-09-03 13:29:38 +08:00
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2.2 Objects
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2017-08-21 17:44:43 +08:00
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.2.2.1" data-path="../concepts/pod-overview.html">
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<a href="../concepts/pod-overview.html">
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2.2.1 Pod
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.2.2.1.1" data-path="../concepts/pod.html">
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<a href="../concepts/pod.html">
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2.2.1.1 Pod解析
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</a>
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2017-08-31 23:28:33 +08:00
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</li>
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<li class="chapter " data-level="1.2.2.1.2" data-path="../concepts/init-containers.html">
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<a href="../concepts/init-containers.html">
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2.2.1.2 Init容器
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</a>
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2017-09-03 15:58:39 +08:00
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</li>
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<li class="chapter " data-level="1.2.2.1.3" data-path="../concepts/pod-security-policy.html">
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<a href="../concepts/pod-security-policy.html">
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2.2.1.3 Pod安全策略
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</a>
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2017-08-21 17:44:43 +08:00
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.2.2.2" data-path="../concepts/node.html">
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<a href="../concepts/node.html">
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2.2.2 Node
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.3" data-path="../concepts/namespace.html">
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<a href="../concepts/namespace.html">
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2.2.3 Namespace
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.4" data-path="../concepts/service.html">
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<a href="../concepts/service.html">
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2.2.4 Service
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.5" data-path="../concepts/volume.html">
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<a href="../concepts/volume.html">
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2.2.5 Volume和Persistent Volume
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.6" data-path="../concepts/deployment.html">
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<a href="../concepts/deployment.html">
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2.2.6 Deployment
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.7" data-path="../concepts/secret.html">
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<a href="../concepts/secret.html">
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2.2.7 Secret
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.8" data-path="../concepts/statefulset.html">
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<a href="../concepts/statefulset.html">
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2.2.8 StatefulSet
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.9" data-path="../concepts/daemonset.html">
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<a href="../concepts/daemonset.html">
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2.2.9 DaemonSet
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.10" data-path="../concepts/serviceaccount.html">
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<a href="../concepts/serviceaccount.html">
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2.2.10 ServiceAccount
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.11" data-path="../concepts/replicaset.html">
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<a href="../concepts/replicaset.html">
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2.2.11 ReplicationController和ReplicaSet
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.12" data-path="../concepts/job.html">
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<a href="../concepts/job.html">
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2.2.12 Job
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.13" data-path="../concepts/cronjob.html">
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<a href="../concepts/cronjob.html">
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2.2.13 CronJob
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.14" data-path="../concepts/ingress.html">
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<a href="../concepts/ingress.html">
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2.2.14 Ingress
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.15" data-path="../concepts/configmap.html">
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<a href="../concepts/configmap.html">
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2.2.15 ConfigMap
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.16" data-path="../concepts/horizontal-pod-autoscaling.html">
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<a href="../concepts/horizontal-pod-autoscaling.html">
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2.2.16 Horizontal Pod Autoscaling
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.17" data-path="../concepts/label.html">
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<a href="../concepts/label.html">
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2.2.17 Label
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</a>
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2017-09-03 15:58:39 +08:00
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</li>
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<li class="chapter " data-level="1.2.2.18" data-path="../concepts/garbage-collection.html">
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<a href="../concepts/garbage-collection.html">
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2.2.18 垃圾收集
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</a>
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</li>
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<li class="chapter " data-level="1.2.2.19" data-path="../concepts/network-policy.html">
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<a href="../concepts/network-policy.html">
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2.2.19 NetworkPolicy
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</a>
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2017-08-21 17:44:43 +08:00
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</li>
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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="1.3" data-path="../guide/">
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<a href="../guide/">
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3. 用户指南
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.3.1" data-path="../guide/resource-configuration.html">
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<a href="../guide/resource-configuration.html">
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3.1 资源配置
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.3.1.1" data-path="../guide/configure-liveness-readiness-probes.html">
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<a href="../guide/configure-liveness-readiness-probes.html">
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3.1.1 配置Pod的liveness和readiness探针
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</a>
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</li>
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<li class="chapter " data-level="1.3.1.2" data-path="../guide/configure-pod-service-account.html">
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<a href="../guide/configure-pod-service-account.html">
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3.1.2 配置Pod的Service Account
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</a>
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</ul>
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</li>
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<li class="chapter " data-level="1.3.2" data-path="../guide/command-usage.html">
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<a href="../guide/command-usage.html">
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3.2 命令使用
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.3.2.1" data-path="../guide/using-kubectl.html">
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<a href="../guide/using-kubectl.html">
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3.2.1 使用kubectl
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</a>
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</ul>
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</li>
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2017-09-07 12:29:13 +08:00
|
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<li class="chapter " data-level="1.3.3" data-path="../guide/cluster-security-management.html">
|
2017-08-21 17:44:43 +08:00
|
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|
2017-09-07 12:29:13 +08:00
|
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<a href="../guide/cluster-security-management.html">
|
2017-08-21 17:44:43 +08:00
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2017-09-07 12:29:13 +08:00
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3.3 集群安全性管理
|
2017-08-21 17:44:43 +08:00
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.3.3.1" data-path="../guide/managing-tls-in-a-cluster.html">
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<a href="../guide/managing-tls-in-a-cluster.html">
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3.3.1 管理集群中的TLS
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</a>
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2017-08-21 18:44:34 +08:00
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</li>
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<li class="chapter " data-level="1.3.3.2" data-path="../guide/kubelet-authentication-authorization.html">
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<a href="../guide/kubelet-authentication-authorization.html">
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3.3.2 kubelet的认证授权
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</a>
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</li>
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<li class="chapter " data-level="1.3.3.3" data-path="../guide/tls-bootstrapping.html">
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<a href="../guide/tls-bootstrapping.html">
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3.3.3 TLS bootstrap
|
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</a>
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|
2017-08-31 14:23:44 +08:00
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</li>
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<li class="chapter " data-level="1.3.3.4" data-path="../guide/kubectl-user-authentication-authorization.html">
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<a href="../guide/kubectl-user-authentication-authorization.html">
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3.3.4 kubectl的用户认证授权
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</a>
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</li>
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<li class="chapter " data-level="1.3.3.5" data-path="../guide/rbac.html">
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<a href="../guide/rbac.html">
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3.3.5 RBAC——基于角色的访问控制
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</a>
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|
2017-09-07 14:13:59 +08:00
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</li>
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<li class="chapter " data-level="1.3.3.6" data-path="../guide/ip-masq-agent.html">
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<a href="../guide/ip-masq-agent.html">
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3.3.6 IP伪装代理
|
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</a>
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2017-08-21 17:44:43 +08:00
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.3.4" data-path="../guide/access-kubernetes-cluster.html">
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<a href="../guide/access-kubernetes-cluster.html">
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3.4 访问 Kubernetes 集群
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.3.4.1" data-path="../guide/access-cluster.html">
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<a href="../guide/access-cluster.html">
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3.4.1 访问集群
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</a>
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</li>
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<li class="chapter " data-level="1.3.4.2" data-path="../guide/authenticate-across-clusters-kubeconfig.html">
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<a href="../guide/authenticate-across-clusters-kubeconfig.html">
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3.4.2 使用 kubeconfig 文件配置跨集群认证
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</a>
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</li>
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<li class="chapter " data-level="1.3.4.3" data-path="../guide/connecting-to-applications-port-forward.html">
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<a href="../guide/connecting-to-applications-port-forward.html">
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3.4.3 通过端口转发访问集群中的应用程序
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</a>
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</li>
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<li class="chapter " data-level="1.3.4.4" data-path="../guide/service-access-application-cluster.html">
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<a href="../guide/service-access-application-cluster.html">
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3.4.4 使用 service 访问群集中的应用程序
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.3.5" data-path="../guide/application-development-deployment-flow.html">
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<a href="../guide/application-development-deployment-flow.html">
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3.5 在kubernetes中开发部署应用
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.3.5.1" data-path="../guide/deploy-applications-in-kubernetes.html">
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<a href="../guide/deploy-applications-in-kubernetes.html">
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3.5.1 适用于kubernetes的应用开发部署流程
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</a>
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2017-08-21 18:44:34 +08:00
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</li>
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<li class="chapter " data-level="1.3.5.2" data-path="../guide/migrating-hadoop-yarn-to-kubernetes.html">
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<a href="../guide/migrating-hadoop-yarn-to-kubernetes.html">
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3.5.2 迁移传统应用到kubernetes中——以Hadoop YARN为例
|
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</a>
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2017-08-21 17:44:43 +08:00
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</li>
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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="1.4" data-path="./">
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<a href="./">
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4. 最佳实践
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.4.1" data-path="install-kbernetes1.6-on-centos.html">
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<a href="install-kbernetes1.6-on-centos.html">
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4.1 在CentOS上部署kubernetes1.6集群
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.4.1.1" data-path="create-tls-and-secret-key.html">
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<a href="create-tls-and-secret-key.html">
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4.1.1 创建TLS证书和秘钥
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</a>
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</li>
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<li class="chapter " data-level="1.4.1.2" data-path="create-kubeconfig.html">
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<a href="create-kubeconfig.html">
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4.1.2 创建kubeconfig文件
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</a>
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</li>
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<li class="chapter " data-level="1.4.1.3" data-path="etcd-cluster-installation.html">
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<a href="etcd-cluster-installation.html">
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4.1.3 创建高可用etcd集群
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</a>
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</li>
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<li class="chapter " data-level="1.4.1.4" data-path="kubectl-installation.html">
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<a href="kubectl-installation.html">
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4.1.4 安装kubectl命令行工具
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</a>
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</li>
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<li class="chapter " data-level="1.4.1.5" data-path="master-installation.html">
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<a href="master-installation.html">
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4.1.5 部署master节点
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</a>
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</li>
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<li class="chapter " data-level="1.4.1.6" data-path="node-installation.html">
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<a href="node-installation.html">
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4.1.6 部署node节点
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</a>
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</li>
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<li class="chapter " data-level="1.4.1.7" data-path="kubedns-addon-installation.html">
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<a href="kubedns-addon-installation.html">
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4.1.7 安装kubedns插件
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</a>
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</li>
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<li class="chapter " data-level="1.4.1.8" data-path="dashboard-addon-installation.html">
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<a href="dashboard-addon-installation.html">
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4.1.8 安装dashboard插件
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</a>
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</li>
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<li class="chapter " data-level="1.4.1.9" data-path="heapster-addon-installation.html">
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<a href="heapster-addon-installation.html">
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4.1.9 安装heapster插件
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</a>
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</li>
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<li class="chapter " data-level="1.4.1.10" data-path="efk-addon-installation.html">
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<a href="efk-addon-installation.html">
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4.1.10 安装EFK插件
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.4.2" data-path="service-discovery-and-loadbalancing.html">
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<a href="service-discovery-and-loadbalancing.html">
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4.2 服务发现与负载均衡
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.4.2.1" data-path="traefik-ingress-installation.html">
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<a href="traefik-ingress-installation.html">
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4.2.1 安装Traefik ingress
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</a>
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</li>
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<li class="chapter " data-level="1.4.2.2" data-path="distributed-load-test.html">
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<a href="distributed-load-test.html">
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4.2.2 分布式负载测试
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</a>
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</li>
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<li class="chapter " data-level="1.4.2.3" data-path="network-and-cluster-perfermance-test.html">
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<a href="network-and-cluster-perfermance-test.html">
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4.2.3 网络和集群性能测试
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</a>
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</li>
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<li class="chapter active" data-level="1.4.2.4" data-path="edge-node-configuration.html">
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<a href="edge-node-configuration.html">
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4.2.4 边缘节点配置
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.4.3" data-path="operation.html">
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<a href="operation.html">
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4.3 运维管理
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.4.3.1" data-path="service-rolling-update.html">
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<a href="service-rolling-update.html">
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4.3.1 服务滚动升级
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</a>
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</li>
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<li class="chapter " data-level="1.4.3.2" data-path="app-log-collection.html">
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<a href="app-log-collection.html">
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4.3.2 应用日志收集
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</a>
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</li>
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<li class="chapter " data-level="1.4.3.3" data-path="configuration-best-practice.html">
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<a href="configuration-best-practice.html">
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4.3.3 配置最佳实践
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</a>
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</li>
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<li class="chapter " data-level="1.4.3.4" data-path="monitor.html">
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<a href="monitor.html">
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4.3.4 集群及应用监控
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</a>
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</li>
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<li class="chapter " data-level="1.4.3.5" data-path="jenkins-ci-cd.html">
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<a href="jenkins-ci-cd.html">
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4.3.5 使用Jenkins进行持续构建与发布
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</a>
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</li>
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<li class="chapter " data-level="1.4.3.6" data-path="data-persistence-problem.html">
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<a href="data-persistence-problem.html">
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4.3.6 数据持久化问题
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</a>
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|
2017-09-03 15:58:39 +08:00
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</li>
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<li class="chapter " data-level="1.4.3.7" data-path="manage-compute-resources-container.html">
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<a href="manage-compute-resources-container.html">
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4.3.7 管理容器的计算资源
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</a>
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|
2017-08-21 17:44:43 +08:00
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.4.4" data-path="storage.html">
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<a href="storage.html">
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4.4 存储管理
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.4.4.1" data-path="glusterfs.html">
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<a href="glusterfs.html">
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4.4.1 GlusterFS
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.4.4.1.1" data-path="using-glusterfs-for-persistent-storage.html">
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<a href="using-glusterfs-for-persistent-storage.html">
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4.4.1.1 使用GlusterFS做持久化存储
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</a>
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</li>
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<li class="chapter " data-level="1.4.4.1.2" data-path="storage-for-containers-using-glusterfs-with-openshift.html">
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<a href="storage-for-containers-using-glusterfs-with-openshift.html">
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4.4.1.2 在OpenShift中使用GlusterFS做持久化存储
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</a>
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|
2017-09-01 21:04:51 +08:00
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.4.4.2" data-path="cephfs.html">
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<a href="cephfs.html">
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4.4.2 CephFS
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.4.4.2.1" data-path="using-ceph-for-persistent-storage.html">
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<a href="using-ceph-for-persistent-storage.html">
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4.4.2.1 使用Ceph做持久化存储
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</a>
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2017-08-21 17:44:43 +08:00
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</li>
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</li>
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<li class="chapter " data-level="1.5" data-path="../usecases/">
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<a href="../usecases/">
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5. 领域应用
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.5.1" data-path="../usecases/microservices.html">
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<a href="../usecases/microservices.html">
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5.1 微服务架构
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.5.1.1" data-path="../usecases/istio.html">
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<a href="../usecases/istio.html">
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5.1.1 Istio
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.5.1.1.1" data-path="../usecases/istio-installation.html">
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<a href="../usecases/istio-installation.html">
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5.1.1.1 安装istio
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</a>
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<li class="chapter " data-level="1.5.1.1.2" data-path="../usecases/configuring-request-routing.html">
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<a href="../usecases/configuring-request-routing.html">
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5.1.1.2 配置请求的路由规则
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</a>
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</li>
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<li class="chapter " data-level="1.5.1.2" data-path="../usecases/linkerd.html">
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<a href="../usecases/linkerd.html">
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5.1.2 Linkerd
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.5.1.2.1" data-path="../usecases/linkerd-user-guide.html">
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<a href="../usecases/linkerd-user-guide.html">
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5.1.2.1 Linkerd 使用指南
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</a>
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</li>
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<li class="chapter " data-level="1.5.1.3" data-path="../usecases/service-discovery-in-microservices.html">
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<a href="../usecases/service-discovery-in-microservices.html">
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5.1.3 微服务中的服务发现
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</a>
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<li class="chapter " data-level="1.5.2" data-path="../usecases/big-data.html">
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<a href="../usecases/big-data.html">
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5.2 大数据
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</a>
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<ul class="articles">
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2017-08-30 14:20:52 +08:00
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<li class="chapter " data-level="1.5.2.1" data-path="../usecases/spark-standalone-on-kubernetes.html">
|
2017-08-21 17:44:43 +08:00
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|
2017-08-30 14:20:52 +08:00
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<a href="../usecases/spark-standalone-on-kubernetes.html">
|
2017-08-21 17:44:43 +08:00
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2017-08-30 14:20:52 +08:00
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5.2.1 Spark standalone on Kubernetes
|
2017-08-21 17:44:43 +08:00
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</a>
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2017-08-31 14:23:44 +08:00
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</li>
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|
2017-09-14 15:57:50 +08:00
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<li class="chapter " data-level="1.5.2.2" data-path="../usecases/running-spark-with-kubernetes-native-scheduler.html">
|
2017-08-31 14:23:44 +08:00
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|
2017-09-14 15:57:50 +08:00
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<a href="../usecases/running-spark-with-kubernetes-native-scheduler.html">
|
2017-08-31 14:23:44 +08:00
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5.2.2 运行支持kubernetes原生调度的Spark程序
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</a>
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2017-08-21 17:44:43 +08:00
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</li>
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</ul>
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2017-08-30 16:52:33 +08:00
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</li>
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<li class="chapter " data-level="1.5.3" data-path="../usecases/serverless.html">
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<a href="../usecases/serverless.html">
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5.3 Serverless架构
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</a>
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2017-08-21 17:44:43 +08:00
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</li>
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</li>
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<li class="chapter " data-level="1.6" data-path="../develop/">
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<a href="../develop/">
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6. 开发指南
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.6.1" data-path="../develop/developing-environment.html">
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<a href="../develop/developing-environment.html">
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6.1 开发环境搭建
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</a>
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</li>
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<li class="chapter " data-level="1.6.2" data-path="../develop/testing.html">
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<a href="../develop/testing.html">
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6.2 单元测试和集成测试
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</a>
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</li>
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<li class="chapter " data-level="1.6.3" data-path="../develop/client-go-sample.html">
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<a href="../develop/client-go-sample.html">
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6.3 client-go示例
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</a>
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</li>
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<li class="chapter " data-level="1.6.4" data-path="../develop/contribute.html">
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<a href="../develop/contribute.html">
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6.4 社区贡献
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</a>
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</li>
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<li class="chapter " data-level="1.7" data-path="../appendix/">
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<a href="../appendix/">
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7. 附录
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.7.1" data-path="../appendix/docker-best-practice.html">
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<a href="../appendix/docker-best-practice.html">
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7.1 Docker最佳实践
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</a>
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<li class="chapter " data-level="1.7.2" data-path="../appendix/issues.html">
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<a href="../appendix/issues.html">
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7.2 问题记录
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</a>
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</li>
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<li class="chapter " data-level="1.7.3" data-path="../appendix/tricks.html">
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<a href="../appendix/tricks.html">
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7.3 使用技巧
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</a>
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<li class="divider"></li>
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<li>
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<a href="https://www.gitbook.com" target="blank" class="gitbook-link">
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本書使用 GitBook 釋出
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<h1>
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<i class="fa fa-circle-o-notch fa-spin"></i>
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<a href=".." >4.2.4 边缘节点配置</a>
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</h1>
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</div>
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<h1 id="边缘节点配置">边缘节点配置</h1>
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<h2 id="前言">前言</h2>
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<p>为了配置kubernetes中的traefik ingress的高可用，对于kubernetes集群以外只暴露一个访问入口，需要使用keepalived排除单点问题。本文参考了<a href="https://github.com/kubernetes/contrib/tree/master/keepalived-vip" target="_blank">kube-keepalived-vip</a>，但并没有使用容器方式安装，而是直接在node节点上安装。</p>
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<h2 id="定义">定义</h2>
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<p>首先解释下什么叫边缘节点（Edge Node），所谓的边缘节点即集群内部用来向集群外暴露服务能力的节点，集群外部的服务通过该节点来调用集群内部的服务，边缘节点是集群内外交流的一个Endpoint。</p>
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<p><strong>边缘节点要考虑两个问题</strong></p>
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<ul>
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<li>边缘节点的高可用，不能有单点故障，否则整个kubernetes集群将不可用</li>
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<li>对外的一致暴露端口，即只能有一个外网访问IP和端口</li>
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</ul>
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<h2 id="架构">架构</h2>
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<p>为了满足边缘节点的以上需求，我们使用<a href="http://www.keepalived.org/" target="_blank">keepalived</a>来实现。</p>
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<p>在Kubernetes中添加了service的同时，在DNS中增加一个记录，这条记录需要跟ingress中的<code>host</code>字段相同，IP地址即VIP的地址，本示例中是<code>172.20.0.119</code>，这样集群外部就可以通过service的DNS名称来访问服务了。</p>
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<p>选择Kubernetes的三个node作为边缘节点，并安装keepalived，下图展示了边缘节点的配置，同时展示了向Kubernetes中添加服务的过程。</p>
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<figure id="fig1.4.2.4.1"><img src="../images/kubernetes-edge-node-architecture.png" alt="边缘节点架构"><figcaption>Figure: 边缘节点架构</figcaption></figure>
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<h2 id="准备">准备</h2>
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<p>复用kubernetes测试集群的三台主机。</p>
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<p>172.20.0.113</p>
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<p>172.20.0.114</p>
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<p>172.20.0.115</p>
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<h2 id="安装">安装</h2>
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<p>使用keepalived管理VIP，VIP是使用IPVS创建的，<a href="http://www.linux-vs.org" target="_blank">IPVS</a>已经成为linux内核的模块，不需要安装</p>
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<p>LVS的工作原理请参考：<a href="http://www.cnblogs.com/codebean/archive/2011/07/25/2116043.html" target="_blank">http://www.cnblogs.com/codebean/archive/2011/07/25/2116043.html</a></p>
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<p>不使用镜像方式安装了，直接手动安装，指定三个节点为边缘节点（Edge node）。</p>
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<p>因为我们的测试集群一共只有三个node，所有在在三个node上都要安装keepalived和ipvsadmin。</p>
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<pre><code class="lang-Shell">yum install keepalived ipvsadm
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</code></pre>
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<h2 id="配置说明">配置说明</h2>
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<p>需要对原先的traefik ingress进行改造，从以Deployment方式启动改成DeamonSet。还需要指定一个与node在同一网段的IP地址作为VIP，我们指定成172.20.0.119，配置keepalived前需要先保证这个IP没有被分配。。</p>
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<ul>
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<li>Traefik以DaemonSet的方式启动</li>
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<li>通过nodeSelector选择边缘节点</li>
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<li>通过hostPort暴露端口</li>
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<li>当前VIP漂移到了172.20.0.115上</li>
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<li>Traefik根据访问的host和path配置，将流量转发到相应的service上</li>
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</ul>
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<h2 id="配置keepalived">配置keepalived</h2>
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<p>参考<a href="http://limian.blog.51cto.com/7542175/1301776" target="_blank">基于keepalived 实现VIP转移，lvs，nginx的高可用</a>，配置keepalived。</p>
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<p>keepalived的官方配置文档见：<a href="http://keepalived.org/pdf/UserGuide.pdf" target="_blank">http://keepalived.org/pdf/UserGuide.pdf</a></p>
|
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<p>配置文件<code>/etc/keepalived/keepalived.conf</code>文件内容如下：</p>
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|
<pre><code>! Configuration File for keepalived
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global_defs {
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notification_email {
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root@localhost
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}
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notification_email_from kaadmin@localhost
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smtp_server 127.0.0.1
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smtp_connect_timeout 30
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router_id LVS_DEVEL
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}
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vrrp_instance VI_1 {
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state MASTER
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interface eth0
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virtual_router_id 51
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priority 100
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advert_int 1
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authentication {
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auth_type PASS
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auth_pass 1111
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}
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virtual_ipaddress {
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172.20.0.119
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}
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}
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virtual_server 172.20.0.119 80{
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delay_loop 6
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lb_algo loadbalance
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lb_kind DR
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nat_mask 255.255.255.0
|
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persistence_timeout 0
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|
protocol TCP
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real_server 172.20.0.113 80{
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|
weight 1
|
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|
TCP_CHECK {
|
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connect_timeout 3
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}
|
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|
}
|
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|
real_server 172.20.0.114 80{
|
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|
weight 1
|
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|
TCP_CHECK {
|
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|
|
connect_timeout 3
|
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|
}
|
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|
}
|
|
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|
|
real_server 172.20.0.115 80{
|
|
|
|
|
weight 1
|
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|
|
TCP_CHECK {
|
|
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|
|
connect_timeout 3
|
|
|
|
|
}
|
|
|
|
|
}
|
|
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|
|
}
|
|
|
|
|
</code></pre><p><code>Realserver</code>的IP和端口即traefik供外网访问的IP和端口。</p>
|
|
|
|
|
<p>将以上配置分别拷贝到另外两台node的<code>/etc/keepalived</code>目录下。</p>
|
|
|
|
|
<p>我们使用转发效率最高的<code>lb_kind DR</code>直接路由方式转发，使用TCP_CHECK来检测real_server的health。</p>
|
|
|
|
|
<p><strong>启动keepalived</strong></p>
|
|
|
|
|
<pre><code>systemctl start keepalived
|
|
|
|
|
</code></pre><p>三台node都启动了keepalived后，观察eth0的IP，会在三台node的某一台上发现一个VIP是172.20.0.119。</p>
|
|
|
|
|
<pre><code class="lang-bash">$ ip addr show eth0
|
|
|
|
|
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
|
|
|
|
|
link/ether f4:e9:d4:9f:6b:a0 brd ff:ff:ff:ff:ff:ff
|
|
|
|
|
inet 172.20.0.115/17 brd 172.20.127.255 scope global eth0
|
|
|
|
|
valid_lft forever preferred_lft forever
|
|
|
|
|
inet 172.20.0.119/32 scope global eth0
|
|
|
|
|
valid_lft forever preferred_lft forever
|
|
|
|
|
</code></pre>
|
|
|
|
|
<p>关掉拥有这个VIP主机上的keepalived，观察VIP是否漂移到了另外两台主机的其中之一上。</p>
|
|
|
|
|
<h2 id="改造traefik">改造Traefik</h2>
|
|
|
|
|
<p>在这之前我们启动的traefik使用的是deployment，只启动了一个pod，无法保证高可用（即需要将pod固定在某一台主机上，这样才能对外提供一个唯一的访问地址），现在使用了keepalived就可以通过VIP来访问traefik，同时启动多个traefik的pod保证高可用。</p>
|
|
|
|
|
<p>配置文件<code>traefik.yaml</code>内容如下：</p>
|
|
|
|
|
<pre><code class="lang-Yaml"><span class="hljs-attr">apiVersion:</span> extensions/v1beta1
|
|
|
|
|
<span class="hljs-attr">kind:</span> DaemonSet
|
|
|
|
|
<span class="hljs-attr">metadata:</span>
|
|
|
|
|
<span class="hljs-attr"> name:</span> traefik-ingress-lb
|
|
|
|
|
<span class="hljs-attr"> namespace:</span> kube-system
|
|
|
|
|
<span class="hljs-attr"> labels:</span>
|
|
|
|
|
<span class="hljs-attr"> k8s-app:</span> traefik-ingress-lb
|
|
|
|
|
<span class="hljs-attr">spec:</span>
|
|
|
|
|
<span class="hljs-attr"> template:</span>
|
|
|
|
|
<span class="hljs-attr"> metadata:</span>
|
|
|
|
|
<span class="hljs-attr"> labels:</span>
|
|
|
|
|
<span class="hljs-attr"> k8s-app:</span> traefik-ingress-lb
|
|
|
|
|
<span class="hljs-attr"> name:</span> traefik-ingress-lb
|
|
|
|
|
<span class="hljs-attr"> spec:</span>
|
|
|
|
|
<span class="hljs-attr"> terminationGracePeriodSeconds:</span> <span class="hljs-number">60</span>
|
|
|
|
|
<span class="hljs-attr"> hostNetwork:</span> <span class="hljs-literal">true</span>
|
|
|
|
|
<span class="hljs-attr"> restartPolicy:</span> Always
|
|
|
|
|
<span class="hljs-attr"> serviceAccountName:</span> ingress
|
|
|
|
|
<span class="hljs-attr"> containers:</span>
|
|
|
|
|
<span class="hljs-attr"> - image:</span> traefik
|
|
|
|
|
<span class="hljs-attr"> name:</span> traefik-ingress-lb
|
|
|
|
|
<span class="hljs-attr"> resources:</span>
|
|
|
|
|
<span class="hljs-attr"> limits:</span>
|
|
|
|
|
<span class="hljs-attr"> cpu:</span> <span class="hljs-number">200</span>m
|
|
|
|
|
<span class="hljs-attr"> memory:</span> <span class="hljs-number">30</span>Mi
|
|
|
|
|
<span class="hljs-attr"> requests:</span>
|
|
|
|
|
<span class="hljs-attr"> cpu:</span> <span class="hljs-number">100</span>m
|
|
|
|
|
<span class="hljs-attr"> memory:</span> <span class="hljs-number">20</span>Mi
|
|
|
|
|
<span class="hljs-attr"> ports:</span>
|
|
|
|
|
<span class="hljs-attr"> - name:</span> http
|
|
|
|
|
<span class="hljs-attr"> containerPort:</span> <span class="hljs-number">80</span>
|
|
|
|
|
<span class="hljs-attr"> hostPort:</span> <span class="hljs-number">80</span>
|
|
|
|
|
<span class="hljs-attr"> - name:</span> admin
|
|
|
|
|
<span class="hljs-attr"> containerPort:</span> <span class="hljs-number">8580</span>
|
|
|
|
|
<span class="hljs-attr"> hostPort:</span> <span class="hljs-number">8580</span>
|
|
|
|
|
<span class="hljs-attr"> args:</span>
|
|
|
|
|
<span class="hljs-bullet"> -</span> --web
|
|
|
|
|
<span class="hljs-bullet"> -</span> --web.address=:<span class="hljs-number">8580</span>
|
|
|
|
|
<span class="hljs-bullet"> -</span> --kubernetes
|
|
|
|
|
<span class="hljs-attr"> nodeSelector:</span>
|
|
|
|
|
<span class="hljs-attr"> edgenode:</span> <span class="hljs-string">"true"</span>
|
|
|
|
|
</code></pre>
|
|
|
|
|
<p>注意，我们使用了<code>nodeSelector</code>选择边缘节点来调度traefik-ingress-lb运行在它上面，所有你需要使用：</p>
|
|
|
|
|
<pre><code>kubectl label nodes 172.20.0.113 edgenode=true
|
|
|
|
|
kubectl label nodes 172.20.0.114 edgenode=true
|
|
|
|
|
kubectl label nodes 172.20.0.115 edgenode=true
|
|
|
|
|
</code></pre><p>给三个node打标签。</p>
|
|
|
|
|
<p>查看DaemonSet的启动情况：</p>
|
|
|
|
|
<pre><code class="lang-Bash">$ kubectl -n kube-system get ds
|
|
|
|
|
NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE-SELECTOR AGE
|
|
|
|
|
traefik-ingress-lb 3 3 3 3 3 edgenode=<span class="hljs-literal">true</span> 2h
|
|
|
|
|
</code></pre>
|
|
|
|
|
<p>现在就可以在外网通过172.20.0.119:80来访问到traefik ingress了。</p>
|
|
|
|
|
<h2 id="参考">参考</h2>
|
|
|
|
|
<p><a href="https://github.com/kubernetes/contrib/tree/master/keepalived-vip" target="_blank">kube-keepalived-vip</a></p>
|
|
|
|
|
<p><a href="http://www.keepalived.org/" target="_blank">http://www.keepalived.org/</a></p>
|
|
|
|
|
<p><a href="http://outofmemory.cn/wiki/keepalived-configuration" target="_blank">keepalived工作原理与配置说明</a></p>
|
|
|
|
|
<p><a href="http://www.cnblogs.com/codebean/archive/2011/07/25/2116043.html" target="_blank">LVS简介及使用</a></p>
|
|
|
|
|
<p><a href="http://limian.blog.51cto.com/7542175/1301776" target="_blank">基于keepalived 实现VIP转移，lvs，nginx的高可用</a> </p>
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<footer class="page-footer-ex"> <span class="page-footer-ex-copyright">for GitBook</span>           <span class="page-footer-ex-footer-update">update
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2017-08-21 18:44:34 +08:00
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