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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 = "配置-pod-的-service-account" > 配 置 Pod 的 Service Account< / h1 >
< p > Service account 为 Pod 中 的 进 程 提 供 身 份 信 息 。 < / p >
< p > < em > 本 文 是 关 于 Service Account 的 用 户 指 南 ， 管 理 指 南 另 见 Service Account 的 集 群 管 理 指 南 。 < / em > < / p >
< p > < em > 注 意 ： 本 文 档 描 述 的 关 于 Serivce Account 的 行 为 只 有 当 您 按 照 Kubernetes 项 目 建 议 的 方 式 搭 建 起 集 群 的 情 况 下 才 有 效 。 您 的 集 群 管 理 员 可 能 在 您 的 集 群 中 有 自 定 义 配 置 ， 这 种 情 况 下 该 文 档 可 能 并 不 适 用 。 < / em > < / p >
< p > 当 您 （ 真 人 用 户 ） 访 问 集 群 （ 例 如 使 用 < code > kubectl< / code > 命 令 ） 时 ， apiserver 会 将 您 认 证 为 一 个 特 定 的 User Account（ 目 前 通 常 是 < code > admin< / code > ， 除 非 您 的 系 统 管 理 员 自 定 义 了 集 群 配 置 ） 。 Pod 容 器 中 的 进 程 也 可 以 与 apiserver 联 系 。 当 它 们 在 联 系 apiserver 的 时 候 ， 它 们 会 被 认 证 为 一 个 特 定 的 Service Account（ 例 如 < code > default< / code > ） 。 < / p >
< h2 id = "使用默认的-service-account-访问-api-server" > 使 用 默 认 的 Service Account 访 问 API server< / h2 >
< p > 当 您 创 建 pod 的 时 候 ， 如 果 您 没 有 指 定 一 个 service account， 系 统 会 自 动 得 在 与 该 pod 相 同 的 namespace 下 为 其 指 派 一 个 < code > default< / code > service account。 如 果 您 获 取 刚 创 建 的 pod 的 原 始 json 或 yaml 信 息 （ 例 如 使 用 < code > kubectl get pods/podename -o yaml< / code > 命 令 ） ， 您 将 看 到 < code > spec.serviceAccountName< / code > 字 段 已 经 被 设 置 为 < a href = "https://kubernetes.io/docs/user-guide/working-with-resources/#resources-are-automatically-modified" target = "_blank" > automatically set< / a > 。 < / p >
< p > 您 可 以 在 pod 中 使 用 自 动 挂 载 的 service account 凭 证 来 访 问 API， 如 < a href = "https://kubernetes.io/docs/user-guide/accessing-the-cluster/#accessing-the-api-from-a-pod" target = "_blank" > Accessing the Cluster< / a > 中 所 描 述 。 < / p >
< p > Service account 是 否 能 够 取 得 访 问 API 的 许 可 取 决 于 您 使 用 的 < a href = "https://kubernetes.io/docs/admin/authorization/#a-quick-note-on-service-accounts" target = "_blank" > 授 权 插 件 和 策 略 < / a > 。 < / p >
< p > 在 1.6 以 上 版 本 中 ， 您 可 以 选 择 取 消 为 service account 自 动 挂 载 API 凭 证 ， 只 需 在 service account 中 设 置 < code > automountServiceAccountToken: false< / code > ： < / 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 > build-robot
< span class = "hljs-attr" > automountServiceAccountToken:< / span > < span class = "hljs-literal" > false< / span >
...
< / code > < / pre >
< p > 在 1.6 以 上 版 本 中 ， 您 也 可 以 选 择 只 取 消 单 个 pod 的 API 凭 证 自 动 挂 载 ： < / p >
< pre > < code class = "lang-yaml" > < span class = "hljs-attr" > apiVersion:< / span > v1
< span class = "hljs-attr" > kind:< / span > Pod
< span class = "hljs-attr" > metadata:< / span >
< span class = "hljs-attr" > name:< / span > my-pod
< span class = "hljs-attr" > spec:< / span >
< span class = "hljs-attr" > serviceAccountName:< / span > build-robot
< span class = "hljs-attr" > automountServiceAccountToken:< / span > < span class = "hljs-literal" > false< / span >
...
< / code > < / pre >
< p > 如 果 在 pod 和 service account 中 同 时 设 置 了 < code > automountServiceAccountToken< / code > , pod 设 置 中 的 优 先 级 更 高 。 < / p >
< h2 id = "使用多个service-account" > 使 用 多 个 Service Account< / h2 >
< p > 每 个 namespace 中 都 有 一 个 默 认 的 叫 做 < code > default< / code > 的 service account 资 源 。 < / p >
< p > 您 可 以 使 用 以 下 命 令 列 出 namespace 下 的 所 有 serviceAccount 资 源 。 < / p >
< pre > < code class = "lang-bash" > $ kubectl get serviceAccounts
NAME SECRETS AGE
default 1 1d
< / code > < / pre >
< p > 您 可 以 像 这 样 创 建 一 个 ServiceAccount 对 象 ： < / p >
< pre > < code class = "lang-bash" > $ cat > /tmp/serviceaccount.yaml < < EOF
apiVersion: v1
kind: ServiceAccount
metadata:
name: build-robot
EOF
$ kubectl create < span class = "hljs-_" > -f< / span > /tmp/serviceaccount.yaml
serviceaccount < span class = "hljs-string" > " build-robot" < / span > created
< / code > < / pre >
< p > 如 果 您 看 到 如 下 的 service account 对 象 的 完 整 输 出 信 息 ： < / p >
< pre > < code class = "lang-bash" > $ kubectl get serviceaccounts/build-robot -o yaml
apiVersion: v1
kind: ServiceAccount
metadata:
creationTimestamp: 2015-06-16T00:12:59Z
name: build-robot
namespace: default
resourceVersion: < span class = "hljs-string" > " 272500" < / span >
selfLink: /api/v1/namespaces/default/serviceaccounts/build-robot
uid: 721ab723-13bc-11e5-aec2-42010af0021e
secrets:
- name: build-robot-token-bvbk5
< / code > < / pre >
< p > 然 后 您 将 看 到 有 一 个 token 已 经 被 自 动 创 建 ， 并 被 service account 引 用 。 < / p >
< p > 您 可 以 使 用 授 权 插 件 来 < a href = "https://kubernetes.io/docs/admin/authorization/#a-quick-note-on-service-accounts" target = "_blank" > 设 置 service account 的 权 限 < / a > 。 < / p >
< p > 设 置 非 默 认 的 service account， 只 需 要 在 pod 的 < code > spec.serviceAccountName< / code > 字 段 中 将 name设 置 为 您 想 要 用 的 service account 名 字 即 可 。 < / p >
< p > 在 pod 创 建 之 初 service account 就 必 须 已 经 存 在 ， 否 则 创 建 将 被 拒 绝 。 < / p >
< p > 您 不 能 更 新 已 创 建 的 pod 的 service account。 < / p >
< p > 您 可 以 清 理 service account， 如 下 所 示 ： < / p >
< pre > < code class = "lang-bash" > $ kubectl delete serviceaccount/build-robot
< / code > < / pre >
< h2 id = "手动创建-service-account-的-api-token" > 手 动 创 建 service account 的 API token< / h2 >
< p > 假 设 我 们 已 经 有 了 一 个 如 上 文 提 到 的 名 为 ” build-robot“ 的 service account， 我 们 手 动 创 建 一 个 新 的 secret。 < / p >
< pre > < code class = "lang-shell" > $ cat > /tmp/build-robot-secret.yaml < < EOF
apiVersion: v1
kind: Secret
metadata:
name: build-robot-secret
annotations:
kubernetes.io/service-account.name: build-robot
type: kubernetes.io/service-account-token
EOF
$ kubectl create -f /tmp/build-robot-secret.yaml
secret " build-robot-secret" created
< / code > < / pre >
< p > 现 在 您 可 以 确 认 下 新 创 建 的 secret 取 代 了 " build-robot" 这 个 service account 原 来 的 API token。 < / p >
< p > 所 有 已 不 存 在 的 service account 的 token 将 被 token controller 清 理 掉 。 < / p >
< pre > < code class = "lang-bash" > $ kubectl describe secrets/build-robot-secret
Name: build-robot-secret
Namespace: default
Labels: < none>
Annotations: kubernetes.io/service-account.name=build-robot,kubernetes.io/service-account.uid=870ef2a5-35cf-11e5-8d06-005056b45392
Type: kubernetes.io/service-account-token
Data
====
ca.crt: 1220 bytes
token: ...
namespace: 7 bytes
< / code > < / pre >
< blockquote >
< p > 注 意 该 内 容 中 的 < code > token< / code > 被 省 略 了 。 < / p >
< / blockquote >
< h2 id = "为-service-account-添加-imagepullsecret" > 为 service account 添 加 ImagePullSecret< / h2 >
< p > 首 先 ， 创 建 一 个 imagePullSecret， 详 见 < a href = "https://kubernetes.io/docs/concepts/containers/images/#specifying-imagepullsecrets-on-a-pod" target = "_blank" > 这 里 < / a > 。 < / p >
< p > 然 后 ， 确 认 已 创 建 。 如 ： < / p >
< pre > < code class = "lang-Bash" > $ kubectl get secrets myregistrykey
NAME TYPE DATA AGE
myregistrykey kubernetes.io/.dockerconfigjson 1 1d
< / code > < / pre >
< p > 然 后 ， 修 改 namespace 中 的 默 认 service account 使 用 该 secret 作 为 imagePullSecret。 < / p >
< pre > < code class = "lang-bash" > kubectl patch serviceaccount default -p < span class = "hljs-string" > ' {" imagePullSecrets" : [{" name" : " myregistrykey" }]}' < / span >
< / code > < / pre >
< p > Vi 交 互 过 程 中 需 要 手 动 编 辑 ： < / p >
< pre > < code class = "lang-bash" > $ kubectl get serviceaccounts default -o yaml > ./sa.yaml
$ cat sa.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
creationTimestamp: 2015-08-07T22:02:39Z
name: default
namespace: default
resourceVersion: < span class = "hljs-string" > " 243024" < / span >
selfLink: /api/v1/namespaces/default/serviceaccounts/default
uid: 052fb0f4-3d50-11e5-b066-42010af0d7b6
secrets:
- name: default-token-uudge
$ vi sa.yaml
[editor session not shown]
[delete line with key < span class = "hljs-string" > " resourceVersion" < / span > ]
[add lines with < span class = "hljs-string" > " imagePullSecret:" < / span > ]
$ cat sa.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
creationTimestamp: 2015-08-07T22:02:39Z
name: default
namespace: default
selfLink: /api/v1/namespaces/default/serviceaccounts/default
uid: 052fb0f4-3d50-11e5-b066-42010af0d7b6
secrets:
- name: default-token-uudge
imagePullSecrets:
- name: myregistrykey
$ kubectl replace serviceaccount default < span class = "hljs-_" > -f< / span > ./sa.yaml
serviceaccounts/default
< / code > < / pre >
< p > 现 在 ， 所 有 当 前 namespace 中 新 创 建 的 pod 的 spec 中 都 会 增 加 如 下 内 容 ： < / p >
< pre > < code class = "lang-yaml" > < span class = "hljs-attr" > spec:< / span >
< span class = "hljs-attr" > imagePullSecrets:< / span >
< span class = "hljs-attr" > - name:< / span > myregistrykey
< / code > < / pre >
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