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1. 前言
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2. 概念原理
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2.1 设计理念
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2.2 Objects
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2.2.1 Pod
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2.2.1.1 Pod解析
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2.2.1.2 Init容器
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2.2.1.3 Pod安全策略
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2.2.1.4 Pod的生命周期
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2.2.2 Node
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2.2.3 Namespace
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2.2.4 Service
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2.2.5 Volume和Persistent Volume
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2.2.6 Deployment
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2.2.7 Secret
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2.2.8 StatefulSet
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2.2.9 DaemonSet
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2.2.10 ServiceAccount
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2.2.11 ReplicationController和ReplicaSet
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2.2.12 Job
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2.2.13 CronJob
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2.2.14 Ingress
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2.2.15 ConfigMap
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2.2.16 Horizontal Pod Autoscaling
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2.2.17 Label
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2.2.18 垃圾收集
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2.2.19 NetworkPolicy
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3. 用户指南
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3.1 资源配置
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3.1.1 配置Pod的liveness和readiness探针
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3.1.2 配置Pod的Service Account
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3.2 命令使用
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3.2.1 使用kubectl
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3.2.2 docker用户过度到kubectl命令行指南
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3.3 集群安全性管理
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3.3.1 管理集群中的TLS
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3.3.2 kubelet的认证授权
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3.3.3 TLS bootstrap
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3.3.4 kubectl的用户认证授权
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3.3.5 RBAC——基于角色的访问控制
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3.3.6 IP伪装代理
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3.4 访问 Kubernetes 集群
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3.4.1 访问集群
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3.4.2 使用 kubeconfig 文件配置跨集群认证
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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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3.4.4 使用 service 访问群集中的应用程序
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3.5 在kubernetes中开发部署应用
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3.5.1 适用于kubernetes的应用开发部署流程
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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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4. 最佳实践
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4.1 在CentOS上部署kubernetes1.6集群
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4.1.1 创建TLS证书和秘钥
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4.1.2 创建kubeconfig文件
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4.1.3 创建高可用etcd集群
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4.1.4 安装kubectl命令行工具
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4.1.5 部署master节点
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4.1.6 部署node节点
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4.1.7 安装kubedns插件
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4.1.8 安装dashboard插件
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4.1.9 安装heapster插件
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4.1.10 安装EFK插件
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4.2 服务发现与负载均衡
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4.2.1 安装Traefik ingress
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4.2.2 分布式负载测试
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4.2.3 网络和集群性能测试
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4.2.4 边缘节点配置
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4.3 运维管理
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4.3.1 服务滚动升级
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4.3.2 应用日志收集
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4.3.3 配置最佳实践
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4.3.4 集群及应用监控
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4.3.5 使用Jenkins进行持续构建与发布
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4.3.6 数据持久化问题
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4.3.7 管理容器的计算资源
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4.4 存储管理
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4.4.1 GlusterFS
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4.4.1.1 使用GlusterFS做持久化存储
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4.4.1.2 在OpenShift中使用GlusterFS做持久化存储
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4.4.2 CephFS
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4.4.2.1 使用Ceph做持久化存储
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5.2.1 Spark standalone on Kubernetes
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5.2.2 运行支持kubernetes原生调度的Spark程序
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< h1 id = "适用于kubernetes的应用开发部署流程" > 适 用 于 kubernetes的 应 用 开 发 部 署 流 程 < / h1 >
< p > 为 了 讲 解 详 细 流 程 ， 我 特 意 写 了 两 个 示 例 程 序 放 在 GitHub中 ， 模 拟 监 控 流 程 ： < / p >
< ul >
< li > < a href = "https://github.com/rootsongjc/k8s-app-monitor-test" target = "_blank" > k8s-app-monitor-test< / a > ： 生 成 模 拟 的 监 控 数 据 ， 发 送 http请 求 ， 获 取 json返 回 值 < / li >
< li > < a href = "https://github.com/rootsongjc/k8s-app-monitor-agent" target = "_blank" > K8s-app-monitor-agent< / a > ： 获 取 监 控 数 据 并 绘 图 ， 访 问 浏 览 器 获 取 图 表 < / li >
< / ul >
< p > API文 档 见 < a href = "https://github.com/rootsongjc/k8s-app-monitor-test" target = "_blank" > k8s-app-monitor-test< / a > 中 的 < code > api.html< / code > 文 件 ， 该 文 档 在 API blueprint中 定 义 ， 使 用 < a href = "https://github.com/danielgtaylor/aglio" target = "_blank" > aglio< / a > 生 成 ， 打 开 后 如 图 所 示 ： < / p >
< figure id = "fig1.3.5.1.1" > < img src = "../images/k8s-app-monitor-test-api-doc.jpg" alt = "API" > < figcaption > Figure: API< / figcaption > < / figure >
< p > < strong > 关 于 服 务 发 现 < / strong > < / p >
< p > < code > K8s-app-monitor-agent< / code > 服 务 需 要 访 问 < code > k8s-app-monitor-test< / code > 服 务 ， 这 就 涉 及 到 服 务 发 现 的 问 题 ， 我 们 在 代 码 中 直 接 写 死 了 要 访 问 的 服 务 的 内 网 DNS地 址 （ kubedns中 的 地 址 ， 即 < code > k8s-app-monitor-test.default.svc.cluster.local< / code > ） 。 < / p >
< p > 我 们 知 道 Kubernetes在 启 动 Pod的 时 候 为 容 器 注 入 环 境 变 量 ， 这 些 环 境 变 量 在 所 有 的 namespace 中 共 享 （ 环 境 变 量 是 不 断 追 加 的 ， 新 启 动 的 Pod中 将 拥 有 老 的 Pod中 所 有 的 环 境 变 量 ， 而 老 的 Pod中 的 环 境 变 量 不 变 ） 。 但 是 既 然 使 用 这 些 环 境 变 量 就 已 经 可 以 访 问 到 对 应 的 service， 那 么 获 取 应 用 的 地 址 信 息 ， 究 竟 是 使 用 变 量 呢 ？ 还 是 直 接 使 用 DNS解 析 来 发 现 ？ < / p >
< p > 答 案 是 使 用 DNS， 详 细 说 明 见 < a href = "http://rootsongjc.github.io/blogs/exploring-kubernetes-env-with-docker/" target = "_blank" > Kubernetes中 的 服 务 发 现 与 Docker容 器 间 的 环 境 变 量 传 递 源 码 探 究 < / a > 。 < / p >
< p > < strong > 打 包 镜 像 < / strong > < / p >
< p > 因 为 我 使 用 wercker自 动 构 建 ， 构 建 完 成 后 自 动 打 包 成 docker镜 像 并 上 传 到 docker hub中 （ 需 要 现 在 docker hub中 创 建 repo） 。 < / p >
< p > 构 建 流 程 见 ： < a href = "https://app.wercker.com/jimmysong/k8s-app-monitor-agent/" target = "_blank" > https://app.wercker.com/jimmysong/k8s-app-monitor-agent/< / a > < / p >
< figure id = "fig1.3.5.1.2" > < img src = "../images/k8s-app-monitor-agent-wercker.jpg" alt = "wercker" > < figcaption > Figure: wercker< / figcaption > < / figure >
< p > 生 成 了 如 下 两 个 docker镜 像 ： < / p >
< ul >
< li > jimmysong/k8s-app-monitor-test:latest< / li >
< li > jimmysong/k8s-app-monitor-agent:latest< / li >
< / ul >
< p > < strong > 启 动 服 务 < / strong > < / p >
< p > 所 有 的 kubernetes应 用 启 动 所 用 的 yaml配 置 文 件 都 保 存 在 那 两 个 GitHub仓 库 的 < code > manifest.yaml< / code > 文 件 中 。 < / p >
< p > 分 别 在 两 个 GitHub目 录 下 执 行 < code > kubectl create -f manifest.yaml< / code > 即 可 启 动 服 务 。 < / p >
< p > < strong > 外 部 访 问 < / strong > < / p >
< p > 服 务 启 动 后 需 要 更 新 ingress配 置 ， 在 < a href = "../manifests/traefik-ingress/ingress.yaml" > ingress.yaml< / a > 文 件 中 增 加 以 下 几 行 ： < / p >
< pre > < code class = "lang-Yaml" > < span class = "hljs-attr" > - host:< / span > k8s-app-monitor-agent.jimmysong.io
< span class = "hljs-attr" > http:< / span >
< span class = "hljs-attr" > paths:< / span >
< span class = "hljs-attr" > - path:< / span > /
< span class = "hljs-attr" > backend:< / span >
< span class = "hljs-attr" > serviceName:< / span > k8s-app-monitor-agent
< span class = "hljs-attr" > servicePort:< / span > < span class = "hljs-number" > 8080< / span >
< / code > < / pre >
< p > 保 存 后 ， 然 后 执 行 < code > kubectl replace -f ingress.yaml< / code > 即 可 刷 新 ingress。 < / p >
< p > 修 改 本 机 的 < code > /etc/hosts< / code > 文 件 ， 在 其 中 加 入 以 下 一 行 ： < / p >
< pre > < code > 172.20.0.119 k8s-app-monitor-agent.jimmysong.io
< / code > < / pre > < p > 当 然 你 也 可 以 加 入 到 DNS中 ， 为 了 简 单 起 见 我 使 用 hosts。 < / p >
< p > 详 见 < a href = "practice/edge-node-configuration.md" > 边 缘 节 点 配 置 < / a > 。 < / p >
< p > 在 浏 览 器 中 访 问 < a href = "http://k8s-app-monitor-agent.jimmysong.io" target = "_blank" > http://k8s-app-monitor-agent.jimmysong.io< / a > < / p >
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< figure id = "fig1.3.5.1.3" > < img src = "../images/k8s-app-monitor-agent.jpg" alt = "图表" > < figcaption > Figure: 图 表 < / figcaption > < / figure >
< footer class = "page-footer-ex" > < span class = "page-footer-ex-copyright" > © All Rights Reserved < / span >                     < span class = "page-footer-ex-footer-update" > updated 2017-08-21 18:23:34 < / span > < / footer >
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