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序言
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1. Kubernetes与云原生应用概览
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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 资源对象配置
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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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3.1.3 Secret配置
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3.2.3 管理namespace中的资源配额
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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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3.5.3 使用StatefulSet部署用状态应用
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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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4.2.5 使用Helm安装Nginx ingress
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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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4.3.6 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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< a href = "using-prometheus-to-monitor-kuberentes-cluster.html" >
4.3.8 使用Prometheus监控kubernetes集群
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4.3.9 使用Heapster获取集群和对象的metric数据
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4.3.10 手动集群升级
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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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< a href = "storage-for-containers-using-glusterfs-with-openshift.html" >
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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4.5 服务编排管理
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4.5.1 使用Helm管理kubernetes应用
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4.5.2 构建私有Chart仓库
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4.6 持续集成与发布
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4.6.1 使用Jenkins进行持续集成与发布
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4.6.2 使用Drone进行持续集成与发布
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5. 领域应用
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5.1 微服务架构
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5.1.1 微服务中的服务发现
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5.2 Service Mesh 服务网格
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5.1.1 Istio
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5.1.1.1 安装istio
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5.1.1.2 配置请求的路由规则
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5.1.2 Linkerd
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5.1.2.1 Linkerd 使用指南
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5.2 大数据
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< a href = "../usecases/spark-standalone-on-kubernetes.html" >
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5.2.1 Spark standalone on Kubernetes
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< a href = "../usecases/running-spark-with-kubernetes-native-scheduler.html" >
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5.2.2 运行支持kubernetes原生调度的Spark程序
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5.3 Serverless架构
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5.4 边缘计算
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6. 开发指南
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6.1 开发环境搭建
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6.2 单元测试和集成测试
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6.3 client-go示例
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6.4 社区贡献
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6.5 Minikube
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7. 附录
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7.1 Docker最佳实践
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7.2 问题记录
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7.3 使用技巧
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7.4 kubernetes中的应用故障排查
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7.5 Kubernetes相关资讯和情报链接
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本书使用 GitBook 发布
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< h1 id = "配置最佳实践" > 配 置 最 佳 实 践 < / h1 >
< p > 本 文 档 旨 在 汇 总 和 强 调 用 户 指 南 、 快 速 开 始 文 档 和 示 例 中 的 最 佳 实 践 。 该 文 档 会 很 活 跃 并 持 续 更 新 中 。 如 果 你 觉 得 很 有 用 的 最 佳 实 践 但 是 本 文 档 中 没 有 包 含 ， 欢 迎 给 我 们 提 Pull Request。 < / p >
< h2 id = "通用配置建议" > 通 用 配 置 建 议 < / h2 >
< ul >
< li > 定 义 配 置 文 件 的 时 候 ， 指 定 最 新 的 稳 定 API版 本 （ 目 前 是 V1） 。 < / li >
< li > 在 配 置 文 件 push到 集 群 之 前 应 该 保 存 在 版 本 控 制 系 统 中 。 这 样 当 需 要 的 时 候 能 够 快 速 回 滚 ， 必 要 的 时 候 也 可 以 快 速 的 创 建 集 群 。 < / li >
< li > 使 用 YAML格 式 而 不 是 JSON格 式 的 配 置 文 件 。 在 大 多 数 场 景 下 它 们 都 可 以 作 为 数 据 交 换 格 式 ， 但 是 YAML格 式 比 起 JSON更 易 读 和 配 置 。 < / li >
< li > 尽 量 将 相 关 的 对 象 放 在 同 一 个 配 置 文 件 里 。 这 样 比 分 成 多 个 文 件 更 容 易 管 理 。 参 考 < a href = "https://github.com/kubernetes/kubernetes/tree/master/examples/guestbook/all-in-one/guestbook-all-in-one.yaml" target = "_blank" > guestbook-all-in-one.yaml< / a > 文 件 中 的 配 置 （ 注 意 ， 尽 管 你 可 以 在 使 用 < code > kubectl< / code > 命 令 时 指 定 配 置 文 件 目 录 ， 你 也 可 以 在 配 置 文 件 目 录 下 执 行 < code > kubectl create< / code > — — 查 看 下 面 的 详 细 信 息 ） 。 < / li >
< li > 为 了 简 化 和 最 小 化 配 置 ， 也 为 了 防 止 错 误 发 生 ， 不 要 指 定 不 必 要 的 默 认 配 置 。 例 如 ， 省 略 掉 < code > ReplicationController< / code > 的 selector和 label， 如 果 你 希 望 它 们 跟 < code > podTemplate< / code > 中 的 label一 样 的 话 ， 因 为 那 些 配 置 默 认 是 < code > podTemplate< / code > 的 label产 生 的 。 更 多 信 息 请 查 看 < a href = "https://github.com/kubernetes/kubernetes/tree/master/examples/guestbook/" target = "_blank" > guestbook app< / a > 的 yaml文 件 和 < a href = "https://github.com/kubernetes/kubernetes/tree/master/examples/guestbook/frontend-deployment.yaml" target = "_blank" > examples< / a > 。 < / li >
< li > 将 资 源 对 象 的 描 述 放 在 一 个 annotation中 可 以 更 好 的 内 省 。 < / li >
< / ul >
< h2 id = "裸的pods-vs-replication-controllers和-jobs" > 裸 的 Pods vs Replication Controllers和 Jobs< / h2 >
< ul >
< li > 如 果 有 其 他 方 式 替 代 “ 裸 的 “ pod（ 如 没 有 绑 定 到 < a href = "https://kubernetes.io/docs/user-guide/replication-controller" target = "_blank" > replication controller < / a > 上 的 pod） ， 那 么 就 使 用 其 他 选 择 。 在 node节 点 出 现 故 障 时 ， 裸 奔 的 pod不 会 被 重 新 调 度 。 Replication Controller总 是 会 重 新 创 建 pod， 除 了 明 确 指 定 了 < a href = "https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle/#restart-policy" target = "_blank" > < code > restartPolicy: Never< / code > < / a > 的 场 景 。 < a href = "https://kubernetes.io/docs/concepts/jobs/run-to-completion-finite-workloads/" target = "_blank" > Job< / a > 也 许 是 比 较 合 适 的 选 择 。 < / li >
< / ul >
< h2 id = "services" > Services< / h2 >
< ul >
< li > 通 常 最 好 在 创 建 相 关 的 < a href = "https://kubernetes.io/docs/concepts/workloads/controllers/replicationcontroller/" target = "_blank" > replication controllers< / a > 之 前 先 创 建 < a href = "https://kubernetes.io/docs/concepts/services-networking/service/" target = "_blank" > service< / a > ， 你 也 可 以 在 创 建 Replication Controller的 时 候 不 指 定 replica数 量 （ 默 认 是 1） ， 创 建 service后 ， 在 通 过 Replication Controller来 扩 容 。 这 样 可 以 在 扩 容 很 多 个 replica之 前 先 确 认 pod是 正 常 的 。 < / li >
< li > 除 非 十 分 必 要 的 情 况 下 （ 如 运 行 一 个 node daemon） ， 不 要 使 用 < code > hostPort< / code > （ 用 来 指 定 暴 露 在 主 机 上 的 端 口 号 ） 。 当 你 给 Pod绑 定 了 一 个 < code > hostPort< / code > ， 该 pod可 被 调 度 到 的 主 机 的 受 限 了 ， 因 为 端 口 冲 突 。 如 果 是 为 了 调 试 目 的 来 通 过 端 口 访 问 的 话 ， 你 可 以 使 用 < a href = "https://kubernetes.io/docs/tasks/access-kubernetes-api/http-proxy-access-api/" target = "_blank" > kubectl proxy and apiserver proxy< / a > 或 者 < a href = "https://kubernetes.io/docs/tasks/access-application-cluster/port-forward-access-application-cluster/" target = "_blank" > kubectl port-forward< / a > 。 你 可 使 用 < a href = "https://kubernetes.io/docs/concepts/services-networking/service/" target = "_blank" > Service< / a > 来 对 外 暴 露 服 务 。 如 果 你 确 实 需 要 将 pod的 端 口 暴 露 到 主 机 上 ， 考 虑 使 用 < a href = "https://kubernetes.io/docs/user-guide/services/#type-nodeport" target = "_blank" > NodePort< / a > service。 < / li >
< li > 跟 < code > hostPort< / code > 一 样 的 原 因 ， 避 免 使 用 < code > hostNetwork< / code > 。 < / li >
< li > 如 果 你 不 需 要 kube-proxy的 负 载 均 衡 的 话 ， 可 以 考 虑 使 用 使 用 < a href = "https://kubernetes.io/docs/user-guide/services/#headless-services" target = "_blank" > headless services< / a > 。 < / li >
< / ul >
< h2 id = "使用label" > 使 用 Label< / h2 >
< ul >
< li > < p > 定 义 < a href = "https://kubernetes.io/docs/user-guide/labels/" target = "_blank" > labels< / a > 来 指 定 应 用 或 Deployment的 < strong > semantic attributes< / strong > 。 例 如 ， 不 是 将 label附 加 到 一 组 pod来 显 式 表 示 某 些 服 务 （ 例 如 ， < code > service:myservice< / code > ） ， 或 者 显 式 地 表 示 管 理 pod的 replication controller（ 例 如 ， < code > controller:mycontroller< / code > ） ， 附 加 label应 该 是 标 示 语 义 属 性 的 标 签 ， 例 如 < code > {app:myapp,tier:frontend,phase:test,deployment:v3}< / code > 。 这 将 允 许 您 选 择 适 合 上 下 文 的 对 象 组 — — 例 如 ， 所 有 的 ” tier:frontend“ pod的 服 务 或 app是 “ myapp” 的 所 有 “ 测 试 ” 阶 段 组 件 。 有 关 此 方 法 的 示 例 ， 请 参 阅 < a href = "https://github.com/kubernetes/kubernetes/tree/master/examples/guestbook/" target = "_blank" > guestbook< / a > 应 用 程 序 。 < / p >
< p > 可 以 通 过 简 单 地 从 其 service的 选 择 器 中 省 略 特 定 于 发 行 版 本 的 标 签 ， 而 不 是 更 新 服 务 的 选 择 器 来 完 全 匹 配 replication controller的 选 择 器 ， 来 实 现 跨 越 多 个 部 署 的 服 务 ， 例 如 滚 动 更 新 。 < / p >
< / li >
< li > < p > 为 了 滚 动 升 级 的 方 便 ， 在 Replication Controller的 名 字 中 包 含 版 本 信 息 ， 例 如 作 为 名 字 的 后 缀 。 设 置 一 个 < code > version< / code > 标 签 页 是 很 有 用 的 。 滚 动 更 新 创 建 一 个 新 的 controller而 不 是 修 改 现 有 的 controller。 因 此 ， version含 混 不 清 的 controller名 字 就 可 能 带 来 问 题 。 查 看 < a href = "https://kubernetes.io/docs/tasks/run-application/rolling-update-replication-controller/" target = "_blank" > Rolling Update Replication Controller< / a > 文 档 获 取 更 多 关 于 滚 动 升 级 命 令 的 信 息 。 < / p >
< p > 注 意 < a href = "https://kubernetes.io/docs/concepts/workloads/controllers/deployment/" target = "_blank" > Deployment< / a > 对 象 不 需 要 再 管 理 replication controller 的 版 本 名 。 Deployment 中 描 述 了 对 象 的 期 望 状 态 ， 如 果 对 spec的 更 改 被 应 用 了 话 ， Deployment controller 会 以 控 制 的 速 率 来 更 改 实 际 状 态 到 期 望 状 态 。 （ Deployment目 前 是 < a href = "https://kubernetes.io/docs/concepts/overview/kubernetes-api/#api-groups" target = "_blank" > < code > extensions< / code > API Group< / a > 的 一 部 分 ） 。 < / p >
< / li >
< li > < p > 利 用 label做 调 试 。 因 为 Kubernetes replication controller和 service使 用 label来 匹 配 pods， 这 允 许 你 通 过 移 除 pod中 的 label的 方 式 将 其 从 一 个 controller或 者 service中 移 除 ， 原 来 的 controller会 创 建 一 个 新 的 pod来 取 代 移 除 的 pod。 这 是 一 个 很 有 用 的 方 式 ， 帮 你 在 一 个 隔 离 的 环 境 中 调 试 之 前 的 “ 活 着 的 ” pod。 查 看 < a href = "https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/" target = "_blank" > < code > kubectl label< / code > < / a > 命 令 。 < / p >
< / li >
< / ul >
< h2 id = "容器镜像" > 容 器 镜 像 < / h2 >
< ul >
< li > < p > < a href = "https://kubernetes.io/docs/concepts/containers/images/" target = "_blank" > 默 认 容 器 镜 像 拉 取 策 略 < / a > 是 < code > IfNotPresent< / code > , 当 本 地 已 存 在 该 镜 像 的 时 候 < a href = "https://kubernetes.io/docs/admin/kubelet/" target = "_blank" > Kubelet< / a > 不 会 再 从 镜 像 仓 库 拉 取 。 如 果 你 希 望 总 是 从 镜 像 仓 库 中 拉 取 镜 像 的 话 ， 在 yaml文 件 中 指 定 镜 像 拉 取 策 略 为 < code > Always< / code > （ < code > imagePullPolicy: Always< / code > ） 或 者 指 定 镜 像 的 tag为 < code > :latest< / code > 。 < / p >
< p > 如 果 你 没 有 将 镜 像 标 签 指 定 为 < code > :latest< / code > ， 例 如 指 定 为 < code > myimage:v1< / code > ， 当 该 标 签 的 镜 像 进 行 了 更 新 ， kubelet也 不 会 拉 取 该 镜 像 。 你 可 以 在 每 次 镜 像 更 新 后 都 生 成 一 个 新 的 tag（ 例 如 < code > myimage:v2< / code > ） ， 在 配 置 文 件 中 明 确 指 定 该 版 本 。 < / p >
< p > < strong > 注 意 ： < / strong > 在 生 产 环 境 下 部 署 容 器 应 该 尽 量 避 免 使 用 < code > :latest< / code > 标 签 ， 因 为 这 样 很 难 追 溯 到 底 运 行 的 是 哪 个 版 本 的 容 器 和 回 滚 。 < / p >
< / li >
< / ul >
< h2 id = "使用kubectl" > 使 用 kubectl< / h2 >
< ul >
< li > 尽 量 使 用 < code > kubectl create -f < directory> < / code > 。 kubeclt会 自 动 查 找 该 目 录 下 的 所 有 后 缀 名 为 < code > .yaml< / code > 、 < code > .yml< / code > 和 < code > .json< / code > 文 件 并 将 它 们 传 递 给 < code > create< / code > 命 令 。 < / li >
< li > 使 用 < code > kubectl delete< / code > 而 不 是 < code > stop< / code > . < code > Delete< / code > 是 < code > stop< / code > 的 超 集 ， < code > stop< / code > 已 经 被 弃 用 。 < / li >
< li > 使 用 kubectl bulk 操 作 （ 通 过 文 件 或 者 label） 来 get和 delete。 查 看 < a href = "https://kubernetes.io/docs/user-guide/labels/#label-selectors" target = "_blank" > label selectors < / a > 和 < a href = "https://kubernetes.io/docs/concepts/cluster-administration/manage-deployment/#using-labels-effectively" target = "_blank" > using labels effectively< / a > 。 < / li >
< li > 使 用 < code > kubectl run< / code > 和 < code > expose< / code > 命 令 快 速 创 建 只 有 单 个 容 器 的 Deployment。 查 看 < a href = "https://kubernetes.io/docs/user-guide/quick-start/" target = "_blank" > quick start guide< / a > 中 的 示 例 。 < / li >
< / ul >
< h2 id = "参考" > 参 考 < / h2 >
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< p > < a href = "https://kubernetes.io/docs/concepts/configuration/overview/" target = "_blank" > Configuration Best Practices< / a > < / p >
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