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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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4.3.8 使用Prometheus监控kubernetes集群
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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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< a href = "../usecases/" >
5. 领域应用
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< li class = "chapter " data-level = "1.5.1" data-path = "../usecases/microservices.html" >
< a href = "../usecases/microservices.html" >
5.1 微服务架构
< / a >
< ul class = "articles" >
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< li class = "chapter " data-level = "1.5.1.1" data-path = "../usecases/service-discovery-in-microservices.html" >
< a href = "../usecases/service-discovery-in-microservices.html" >
5.1.1 微服务中的服务发现
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< li class = "chapter " data-level = "1.5.2" data-path = "../usecases/service-mesh.html" >
< a href = "../usecases/service-mesh.html" >
5.2 Service Mesh 服务网格
< / a >
< ul class = "articles" >
< li class = "chapter " data-level = "1.5.2.1" data-path = "../usecases/istio.html" >
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< a href = "../usecases/istio.html" >
5.1.1 Istio
< / a >
< ul class = "articles" >
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< li class = "chapter " data-level = "1.5.2.1.1" data-path = "../usecases/istio-installation.html" >
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< a href = "../usecases/istio-installation.html" >
5.1.1.1 安装istio
< / a >
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< li class = "chapter " data-level = "1.5.2.1.2" data-path = "../usecases/configuring-request-routing.html" >
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< a href = "../usecases/configuring-request-routing.html" >
5.1.1.2 配置请求的路由规则
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< li class = "chapter " data-level = "1.5.2.2" data-path = "../usecases/linkerd.html" >
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< a href = "../usecases/linkerd.html" >
5.1.2 Linkerd
< / a >
< ul class = "articles" >
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< li class = "chapter " data-level = "1.5.2.2.1" data-path = "../usecases/linkerd-user-guide.html" >
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< a href = "../usecases/linkerd-user-guide.html" >
5.1.2.1 Linkerd 使用指南
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< li class = "chapter " data-level = "1.5.3" data-path = "../usecases/big-data.html" >
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< a href = "../usecases/big-data.html" >
5.2 大数据
< / a >
< ul class = "articles" >
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< li class = "chapter " data-level = "1.5.3.1" data-path = "../usecases/spark-standalone-on-kubernetes.html" >
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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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< / li >
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< li class = "chapter " data-level = "1.5.3.2" data-path = "../usecases/running-spark-with-kubernetes-native-scheduler.html" >
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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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< li class = "chapter " data-level = "1.5.4" data-path = "../usecases/serverless.html" >
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< a href = "../usecases/serverless.html" >
5.3 Serverless架构
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< / li >
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< li class = "chapter " data-level = "1.6" data-path = "../develop/" >
< a href = "../develop/" >
6. 开发指南
< / a >
< ul class = "articles" >
< li class = "chapter " data-level = "1.6.1" data-path = "../develop/developing-environment.html" >
< a href = "../develop/developing-environment.html" >
6.1 开发环境搭建
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< li class = "chapter " data-level = "1.6.2" data-path = "../develop/testing.html" >
< a href = "../develop/testing.html" >
6.2 单元测试和集成测试
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< li class = "chapter " data-level = "1.6.3" data-path = "../develop/client-go-sample.html" >
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6.3 client-go示例
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< a href = "../develop/contribute.html" >
6.4 社区贡献
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7. 附录
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< li class = "chapter " data-level = "1.7.1" data-path = "../appendix/docker-best-practice.html" >
< a href = "../appendix/docker-best-practice.html" >
7.1 Docker最佳实践
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< a href = "../appendix/issues.html" >
7.2 问题记录
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< a href = "../appendix/tricks.html" >
7.3 使用技巧
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< / li >
< li class = "chapter " data-level = "1.7.4" data-path = "../appendix/debug-kubernetes-services.html" >
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7.4 kubernetes service中的故障排查
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< li >
< a href = "https://www.gitbook.com" target = "blank" class = "gitbook-link" >
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本书使用 GitBook 发布
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< div class = "book-body" >
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< div class = "book-header" role = "navigation" >
<!-- Title -->
< h1 >
< i class = "fa fa-circle-o-notch fa-spin" > < / i >
< a href = ".." > 4.2.1 安装Traefik ingress< / a >
< / h1 >
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< div class = "page-wrapper" tabindex = "-1" role = "main" >
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< section class = "normal markdown-section" >
< h1 id = "安装traefik-ingress" > 安 装 traefik ingress< / h1 >
< h2 id = "ingress简介" > Ingress简 介 < / h2 >
< p > 如 果 你 还 不 了 解 ， ingress是 什 么 ， 可 以 先 看 下 我 翻 译 的 Kubernetes官 网 上 ingress的 介 绍 < a href = "http://rootsongjc.github.io/blogs/kubernetes-ingress-resource/" target = "_blank" > Kubernetes Ingress解 析 < / a > 。 < / p >
< p > < strong > 理 解 Ingress< / strong > < / p >
< p > 简 单 的 说 ， ingress就 是 从 kubernetes集 群 外 访 问 集 群 的 入 口 ， 将 用 户 的 URL请 求 转 发 到 不 同 的 service上 。 Ingress相 当 于 nginx、 apache等 负 载 均 衡 方 向 代 理 服 务 器 ， 其 中 还 包 括 规 则 定 义 ， 即 URL的 路 由 信 息 ， 路 由 信 息 得 的 刷 新 由 < a href = "https://kubernetes.io/docs/concepts/services-networking/ingress/#ingress-controllers" target = "_blank" > Ingress controller< / a > 来 提 供 。 < / p >
< p > < strong > 理 解 Ingress Controller< / strong > < / p >
< p > Ingress Controller 实 质 上 可 以 理 解 为 是 个 监 视 器 ， Ingress Controller 通 过 不 断 地 跟 kubernetes API 打 交 道 ， 实 时 的 感 知 后 端 service、 pod 等 变 化 ， 比 如 新 增 和 减 少 pod， service 增 加 与 减 少 等 ； 当 得 到 这 些 变 化 信 息 后 ， Ingress Controller 再 结 合 下 文 的 Ingress 生 成 配 置 ， 然 后 更 新 反 向 代 理 负 载 均 衡 器 ， 并 刷 新 其 配 置 ， 达 到 服 务 发 现 的 作 用 。 < / p >
< h2 id = "部署traefik" > 部 署 Traefik< / h2 >
< p > < strong > 介 绍 traefik< / strong > < / p >
< p > < a href = "https://traefik.io/" target = "_blank" > Traefik< / a > 是 一 款 开 源 的 反 向 代 理 与 负 载 均 衡 工 具 。 它 最 大 的 优 点 是 能 够 与 常 见 的 微 服 务 系 统 直 接 整 合 ， 可 以 实 现 自 动 化 动 态 配 置 。 目 前 支 持 Docker, Swarm, Mesos/Marathon, Mesos, Kubernetes, Consul, Etcd, Zookeeper, BoltDB, Rest API等 等 后 端 模 型 。 < / p >
< p > 以 下 配 置 文 件 可 以 在 < a href = "https://github.com/rootsongjc/kubernetes-handbook" target = "_blank" > kubernetes-handbook< / a > GitHub仓 库 中 的 < a href = "../manifests/traefik-ingress" > manifests/traefik-ingress/< / a > 目 录 下 找 到 。 < / p >
< p > < strong > 创 建 ingress-rbac.yaml< / strong > < / p >
< p > 将 用 于 service account验 证 。 < / p >
< pre > < code class = "lang-Yaml" > < span class = "hljs-attr" > apiVersion:< / span > v1
< span class = "hljs-attr" > kind:< / span > ServiceAccount
< span class = "hljs-attr" > metadata:< / span >
< span class = "hljs-attr" > name:< / span > ingress
< span class = "hljs-attr" > namespace:< / span > kube-system
< span class = "hljs-meta" > ---< / span >
< span class = "hljs-attr" > kind:< / span > ClusterRoleBinding
< span class = "hljs-attr" > apiVersion:< / span > rbac.authorization.k8s.io/v1beta1
< span class = "hljs-attr" > metadata:< / span >
< span class = "hljs-attr" > name:< / span > ingress
< span class = "hljs-attr" > subjects:< / span >
< span class = "hljs-attr" > - kind:< / span > ServiceAccount
< span class = "hljs-attr" > name:< / span > ingress
< span class = "hljs-attr" > namespace:< / span > kube-system
< span class = "hljs-attr" > roleRef:< / span >
< span class = "hljs-attr" > kind:< / span > ClusterRole
< span class = "hljs-attr" > name:< / span > cluster-admin
< span class = "hljs-attr" > apiGroup:< / span > rbac.authorization.k8s.io
< / code > < / pre >
< p > < strong > 创 建 名 为 < code > traefik-ingress< / code > 的 ingress< / strong > ， 文 件 名 traefik.yaml< / p >
< pre > < code class = "lang-yaml" > < span class = "hljs-attr" > apiVersion:< / span > extensions/v1beta1
< span class = "hljs-attr" > kind:< / span > Ingress
< span class = "hljs-attr" > metadata:< / span >
< span class = "hljs-attr" > name:< / span > traefik-ingress
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< span class = "hljs-attr" > namespace:< / span > default
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< span class = "hljs-attr" > spec:< / span >
< span class = "hljs-attr" > rules:< / span >
< span class = "hljs-attr" > - host:< / span > traefik.nginx.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 > my-nginx
< span class = "hljs-attr" > servicePort:< / span > < span class = "hljs-number" > 80< / span >
< span class = "hljs-attr" > - host:< / span > traefik.frontend.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 > frontend
< span class = "hljs-attr" > servicePort:< / span > < span class = "hljs-number" > 80< / span >
< / code > < / pre >
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< p > 这 其 中 的 < code > backend< / code > 中 要 配 置 default namespace中 启 动 的 service名 字 ， 如 果 你 没 有 配 置 namespace名 字 ， 默 认 使 用 default namespace， 如 果 你 在 其 他 namespace中 创 建 服 务 想 要 暴 露 到 kubernetes集 群 外 部 ， 可 以 创 建 新 的 ingress.yaml文 件 ， 同 时 在 文 件 中 指 定 该 < code > namespace< / code > ， 其 他 配 置 与 上 面 的 文 件 格 式 相 同 。 。 < code > path< / code > 就 是 URL地 址 后 的 路 径 ， 如 traefik.frontend.io/path， service将 会 接 受 path这 个 路 径 ， host最 好 使 用 service-name.filed1.filed2.domain-name这 种 类 似 主 机 名 称 的 命 名 方 式 ， 方 便 区 分 服 务 。 < / p >
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< p > 根 据 你 自 己 环 境 中 部 署 的 service的 名 字 和 端 口 自 行 修 改 ， 有 新 service增 加 时 ， 修 改 该 文 件 后 可 以 使 用 < code > kubectl replace -f traefik.yaml< / code > 来 更 新 。 < / p >
< p > 我 们 现 在 集 群 中 已 经 有 两 个 service了 ， 一 个 是 nginx， 另 一 个 是 官 方 的 < code > guestbook< / code > 例 子 。 < / p >
< p > < strong > 创 建 Depeloyment< / strong > < / p >
< pre > < code class = "lang-Yaml" > < span class = "hljs-attr" > apiVersion:< / span > extensions/v1beta1
< span class = "hljs-attr" > kind:< / span > Deployment
< 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
< / code > < / pre >
< p > 注 意 我 们 这 里 用 的 是 Deploy类 型 ， 没 有 限 定 该 pod运 行 在 哪 个 主 机 上 。 Traefik的 端 口 是 8580。 < / p >
< p > < strong > Traefik UI< / strong > < / p >
< pre > < code class = "lang-yaml" > < span class = "hljs-attr" > apiVersion:< / span > v1
< span class = "hljs-attr" > kind:< / span > Service
< span class = "hljs-attr" > metadata:< / span >
< span class = "hljs-attr" > name:< / span > traefik-web-ui
< span class = "hljs-attr" > namespace:< / span > kube-system
< span class = "hljs-attr" > spec:< / span >
< span class = "hljs-attr" > selector:< / span >
< span class = "hljs-attr" > k8s-app:< / span > traefik-ingress-lb
< span class = "hljs-attr" > ports:< / span >
< span class = "hljs-attr" > - name:< / span > web
< span class = "hljs-attr" > port:< / span > < span class = "hljs-number" > 80< / span >
< span class = "hljs-attr" > targetPort:< / span > < span class = "hljs-number" > 8580< / span >
< span class = "hljs-meta" > ---< / span >
< span class = "hljs-attr" > apiVersion:< / span > extensions/v1beta1
< span class = "hljs-attr" > kind:< / span > Ingress
< span class = "hljs-attr" > metadata:< / span >
< span class = "hljs-attr" > name:< / span > traefik-web-ui
< span class = "hljs-attr" > namespace:< / span > kube-system
< span class = "hljs-attr" > spec:< / span >
< span class = "hljs-attr" > rules:< / span >
< span class = "hljs-attr" > - host:< / span > traefik-ui.local
< 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 > traefik-web-ui
< span class = "hljs-attr" > servicePort:< / span > web
< / code > < / pre >
< p > 配 置 完 成 后 就 可 以 启 动 treafik ingress了 。 < / p >
< pre > < code > kubectl create -f .
< / code > < / pre > < p > 我 查 看 到 traefik的 pod在 < code > 172.20.0.115< / code > 这 台 节 点 上 启 动 了 。 < / p >
< p > 访 问 该 地 址 < code > http://172.20.0.115:8580/< / code > 将 可 以 看 到 dashboard。 < / p >
< figure id = "fig1.4.2.1.1" > < img src = "../images/traefik-dashboard.jpg" alt = "kubernetes-dashboard" > < figcaption > Figure: kubernetes-dashboard< / figcaption > < / figure >
< p > 左 侧 黄 色 部 分 部 分 列 出 的 是 所 有 的 rule， 右 侧 绿 色 部 分 是 所 有 的 backend。 < / p >
< h2 id = "测试" > 测 试 < / h2 >
< p > 在 集 群 的 任 意 一 个 节 点 上 执 行 。 假 如 现 在 我 要 访 问 nginx的 " /" 路 径 。 < / p >
< pre > < code class = "lang-bash" > $ curl -H Host:traefik.nginx.io http://172.20.0.115/
< !DOCTYPE html>
< html>
< head>
< title> Welcome to nginx!< /title>
< style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
< /style>
< /head>
< body>
< h1> Welcome to nginx!< /h1>
< p> If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.< /p>
< p> For online documentation and support please refer to
< a href=< span class = "hljs-string" > " http://nginx.org/" < / span > > nginx.org< /a> .< br/>
Commercial support is available at
< a href=< span class = "hljs-string" > " http://nginx.com/" < / span > > nginx.com< /a> .< /p>
< p> < em> Thank you < span class = "hljs-keyword" > for< / span > using nginx.< /em> < /p>
< /body>
< /html>
< / code > < / pre >
< p > 如 果 你 需 要 在 kubernetes集 群 以 外 访 问 就 需 要 设 置 DNS， 或 者 修 改 本 机 的 hosts文 件 。 < / p >
< p > 在 其 中 加 入 ： < / p >
< pre > < code > 172.20.0.115 traefik.nginx.io
172.20.0.115 traefik.frontend.io
< / code > < / pre > < p > 所 有 访 问 这 些 地 址 的 流 量 都 会 发 送 给 172.20.0.115这 台 主 机 ， 就 是 我 们 启 动 traefik的 主 机 。 < / p >
< p > Traefik会 解 析 http请 求 header里 的 Host参 数 将 流 量 转 发 给 Ingress配 置 里 的 相 应 service。 < / p >
< p > 修 改 hosts后 就 就 可 以 在 kubernetes集 群 外 访 问 以 上 两 个 service， 如 下 图 ： < / p >
< figure id = "fig1.4.2.1.2" > < img src = "../images/traefik-nginx.jpg" alt = "traefik-nginx" > < figcaption > Figure: traefik-nginx< / figcaption > < / figure >
< figure id = "fig1.4.2.1.3" > < img src = "../images/traefik-guestbook.jpg" alt = "traefik-guestbook" > < figcaption > Figure: traefik-guestbook< / figcaption > < / figure >
< h2 id = "参考" > 参 考 < / h2 >
< p > < a href = "http://www.colabug.com/thread-1703745-1-1.html" target = "_blank" > Traefik-kubernetes 初 试 < / a > < / p >
< p > < a href = "http://www.tuicool.com/articles/ZnuEfay" target = "_blank" > Traefik简 介 < / a > < / p >
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< p > < a href = "https://github.com/kubernetes/kubernetes/tree/master/examples/guestbook" target = "_blank" > Guestbook example< / a > < / p >
< 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 18:23:35 < / span > < / footer >
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