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website/content/zh/docs/reference/setup-tools/kubeadm/kubeadm-join.md
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LiuDui b8b2cc7c74 ZH-trans: merge release1.16-temporary to master (#18217)
* zh-trans:/docs/docs/concepts/workloads/pods/ephemeral-containers.md (#16948)

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* update-zh-translation/docs/reference/setup-tools/kubeadm/kubeadm-init.md (#16997)

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* update zh translation /docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_kubeconfig.md (#17078)

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* translate configure_upgrade_etcd (#17160)

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* update zh /docs/tasks/job/coarse-parallel-processing-work-queue.md (#17155)

* translate docs/setup/release/version-skew-policy.md to Chinese (#17142)

* update zh trans content/zh/docs/tasks/access-application-cluster/create-external-load-balancer.md (#17124)

* zh-trans replace the wrong translation (#17103)

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* Merged 1.14~1.16 changes (#17117)

* zh-trans:/docs/concepts/configuration/assign-pod-node.md (#17129)

* update zh trans /docs/contribute/generate-ref-docs/kubernetes-api.md (#17161)

* pr_release-1.16_basic-ss (#17169)

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* update zh trans content/zh/docs/concepts/overview/working-with-objects/common-labels.md (#17193)

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* zh-trans:docs/setup/production-environment/turnkey/tencent.md (#17207)

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* update zh trans content/zh/docs/concepts/extend-kubernetes/extend-cluster.md (#17212)

* update zh trans content/zh/docs/concepts/extend-kubernetes/api-extension/apiserver-aggregation.md (#17213)

* add zh trans /docs/reference/setup-tools/kubeadm/generated/kubeadm_join_phase_control-plane-prepare_kubeconfig.md (#17220)

kubeadm_join_phase_control-plane-prepare_download-certs.md

* add zh trans /reference/setup-tools/kubeadm/generated/kubeadm_init_phase_certs.md and /reference/setup-tools/kubeadm/generated/kubeadm_join_phase_control-plane-prepare.md (#17219)

* update zh trans content/zh/docs/concepts/containers/images.md (#17216)

* ZH-trans: add _index.md (#17214)

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* pr_release-1.16_crd-versions (#17198)

* update zh translation /docs/reference/setup-tools/kubeadm/generated/kubeadm_config_images_pull.md (#17092)

* zh-trans /reference/setup-tools/kubeadm/generated/kubeadm_config_images.md (#17094)

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_addon_kube-proxy.md   and   content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_certs_sa.md (#17222)

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_join_phase_control-plane-prepare_all.md  content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_join_phase_control-plane-prepare_certs.md (#17221)

* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_addon_all.md (#17223)

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* zh-trans:/reference/setup-tools/kubeadm/generated/kubeadm_completion.md and kubeadm_config.md (#17097)

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* add zh trans /docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_kubeconfig_user.md and /docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_upload-config_kubeadm.md (#17228)

* zh-translation:content/zh/docs/tasks/extend-kubectl/kubectl-plugins.md (#17089)

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* update zh translation /docs/reference/setup-tools/kubeadm/generated/kubeadm_join.md (#17080)

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* zh-translation:troubleshooting-kubeadm.md (#17069)

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* zh-trans: docs/concepts/scheduling/kube-scheduler.md (#17067)

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* Update kube-scheduler.md

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* translate kubeadm-certs.md (#17090)

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* update zh /docs/concepts/architecture/cloud-controller.md (#17263)

* update zh /docs/concepts/cluster-administration/logging.md (#17247)

* modify the show of zh translation /concepts/overview/what-is-kubernetes.md /reference/setup-tools/kubeadm/generated/kubeadm_init.md  /reference/setup-tools/kubeadm/kubeadm-init.md (#17246)

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* add content/zh/docs/reference/glossary/container-runtime.md file fix-up to pass the ci and trans content/zh/docs/reference/glossary/container-runtime.md、content/zh/docs/concepts/overview/components.md (#17211)

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* Create advanced.md (#17256)

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* pr_release-1.16_ext-admission-ctl (#17196)

* update zh translation /docs/contribute/advanced.md (#17042)

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* add zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_config_print.md update zh trans content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_config.md、content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_config_print_init-defaults.md (#17282)

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mikedanese
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jbeda
kubeadm join templates/concept 30

{{% capture overview %}}

此命令用来初始化 Kubernetes 工作节点并将其加入集群。 {{% /capture %}}

{{% capture body %}} {{< include "generated/kubeadm_join.md" >}}

加入流程

kubeadm join 初始化 Kubernetes 工作节点并将其加入集群。 该操作过程包含下面几个步骤:

  1. kubeadm 从 API 服务器下载必要的集群信息。 默认情况下,它使用引导令牌和 CA 密钥哈希来验证数据的真实性。 也可以通过文件或 URL 直接发现根 CA。

  2. 如果调用 kubeadm 时启用了 --feature-gates=DynamicKubeletConfig,它首先从主机上检索 kubelet 初始化配置并将其写入磁盘。 当 kubelet 启动时,kubeadm 更新节点的 Node.spec.configSource 属性。 进一步了解动态 kubelet 配置 请参考 使用配置文件设置 Kubelet 参数重新配置集群中节点的 Kubelet

  3. 一旦知道集群信息,kubelet 就可以开始 TLS 引导过程。 TLS 引导程序使用共享令牌与 Kubernetes API 服务器进行临时的身份验证,以提交证书签名请求 (CSR); 默认情况下,控制平面自动对该 CSR 请求进行签名。

  4. 最后,kubeadm 配置本地 kubelet 使用分配给节点的确定标识连接到 API 服务器。

发现要信任的集群 CA

Kubeadm 的发现有几个选项,每个选项都有安全性上的优缺点。 适合您的环境的正确方法取决于节点是如何准备的以及您对网络的安全性期望和节点的生命周期特点。

带 CA 锁定模式的基于令牌的发现

这是 Kubernetes 1.8 及以上版本中的默认模式。 在这种模式下,kubeadm 下载集群配置(包括根CA)并使用令牌验证它,并且会验证根 CA 的公钥与所提供的哈希是否匹配,以及 API 服务器证书在根 CA 下是否有效。

CA 键哈希格式为 sha256:<hex_encoded_hash>。 默认情况下,在 kubeadm init 最后打印的 kubeadm join 命令或者 kubeadm token create--print-join-command 的输出信息中返回哈希值。 它使用标准格式 (请参考 RFC7469) 并且也能通过第三方工具或者驱动系统进行计算。 例如,使用 OpenSSL CLI

openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssl dgst -sha256 -hex | sed 's/^.* //'

kubeadm join 命令示例

kubeadm join --discovery-token abcdef.1234567890abcdef --discovery-token-ca-cert-hash sha256:1234..cdef 1.2.3.4:6443

优势:

  • 允许引导节点安全地发现主节点的信任根,即使其他工作节点或网络受到损害。

  • 方便手动执行,因为所需的所有信息都适合于易于复制和粘贴的单个 kubeadm join 命令。

劣势:

  • CA 哈希通常在主节点被提供之前是不知道的,这使得构建使用 kubeadm 的自动化配置工具更加困难。 通过预先生成CA,您可以解决这个限制。

无 CA 锁定模式的基于令牌的发现

_这是 Kubernetes 1.7 和早期版本_中的默认设置;使用时要注意一些重要的补充说明。 此模式仅依赖于对称令牌来签名(HMAC-SHA256)发现信息,这些发现信息为主节点建立信任根。 在 Kubernetes 1.8 及以上版本中仍然可以使用 --discovery-token-unsafe-skip-ca-verification 参数,但是如果可能的话,您应该考虑使用一种其他模式。

kubeadm join 命令示例

kubeadm join --token abcdef.1234567890abcdef --discovery-token-unsafe-skip-ca-verification 1.2.3.4:6443`

优势

  • 仍然可以防止许多网络级攻击。

  • 可以提前生成令牌并与主节点和工作节点共享,这样主节点和工作节点就可以并行引导而无需协调。 这允许它在许多配置场景中使用。

劣势

  • 如果攻击者能够通过某些漏洞窃取引导令牌,那么他们可以使用该令牌(连同网络级访问)为其它处于引导过程中的节点提供假冒的主节点。 在您的环境中,这可能是一个适当的折衷方法,也可能不是。

基于 HTTPS 或文件发现

这种方案提供了一种带外方式在主节点和引导节点之间建立信任根。 如果使用 kubeadm 构建自动配置,请考虑使用此模式。

kubeadm join 命令示例:

  • kubeadm join --discovery-file path/to/file.conf (本地文件)

  • kubeadm join --discovery-file https://url/file.conf (远程 HTTPS URL)

优势:

  • 允许引导节点安全地发现主节点的信任根,即使网络或其他工作节点受到损害。

劣势:

  • 要求您有某种方法将发现信息从主节点传送到引导节点。 例如,这可以通过云提供商或驱动工具实现。 该文件中的信息不是加密的,而是需要 HTTPS 或等效文件来保证其完整性。

确保您的安装更加安全

Kubeadm 的默认值可能不适用于所有人。 本节说明如何以牺牲可用性为代价来加强 kubeadm 安装。

关闭节点客户端证书的自动批准

默认情况下,Kubernetes 启用了 CSR 自动批准器,如果在身份验证时使用 Bootstrap Token,它会批准对 kubelet 的任何客户端证书的请求。 如果不希望集群自动批准kubelet客户端证书,可以通过执行以下命令关闭它:

$ kubectl delete clusterrole kubeadm:node-autoapprove-bootstrap

关闭后,kubeadm join 操作将会被阻断,直到管理员已经手动批准了在途中的 CSR 才会继续:

$ kubectl get csr
NAME                                                   AGE       REQUESTOR                 CONDITION
node-csr-c69HXe7aYcqkS1bKmH4faEnHAWxn6i2bHZ2mD04jZyQ   18s       system:bootstrap:878f07   Pending

$ kubectl certificate approve node-csr-c69HXe7aYcqkS1bKmH4faEnHAWxn6i2bHZ2mD04jZyQ
certificatesigningrequest "node-csr-c69HXe7aYcqkS1bKmH4faEnHAWxn6i2bHZ2mD04jZyQ" approved

$ kubectl get csr
NAME                                                   AGE       REQUESTOR                 CONDITION
node-csr-c69HXe7aYcqkS1bKmH4faEnHAWxn6i2bHZ2mD04jZyQ   1m        system:bootstrap:878f07   Approved,Issued

只有执行了 kubectl certificate approve 后,kubeadm join 才会继续。

关闭对集群信息 ConfigMap 的公开访问

为了实现使用令牌作为唯一验证信息的加入工作流,默认情况下会公开带有验证主节点标识所需数据的 ConfigMap。 虽然此 ConfigMap 中没有私有数据,但一些用户可能希望无论如何都关闭它。 这样做需要禁用 kubeadm join 工作流的 --discovery-token 参数。 以下是实现步骤:

$ kubectl -n kube-public get cm cluster-info -o yaml | grep "kubeconfig:" -A11 | grep "apiVersion" -A10 | sed "s/    //" | tee cluster-info.yaml
apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: <ca-cert>
    server: https://<ip>:<port>
  name: ""
contexts: []
current-context: ""
kind: Config
preferences: {}
users: []
  • 使用 cluster-info.yaml 文件作为 kubeadm join --discovery-file 参数。

  • 关闭 cluster-info ConfigMap 的公开访问:

$ kubectl -n kube-public delete rolebinding kubeadm:bootstrap-signer-clusterinfo

这些命令应该在执行 kubeadm init 之后、在kubeadm join 之前执行。

使用带有配置文件的 kubeadm join

{{< caution >}}

配置文件目前是 alpha 功能,在将来的版本中可能会变动。 {{< /caution >}}

可以用配置文件替代命令行参数的方法配置 kubeadm join,一些高级功能也只有在使用配置文件时才可选用。 该文件通过 --config 参数来传递,并且文件中必须包含 JoinConfiguration 结构。

执行下面的命令可以查看 JoinConfiguration 默认值:

kubeadm config print-default --api-objects=JoinConfiguration

要了解 JoinConfiguration 中各个字段的详细信息请参考 godoc。 {{% /capture %}}

{{% capture whatsnext %}}

  • kubeadm init 初始化 Kubernetes 主节点
  • kubeadm token 管理 kubeadm join 的令牌
  • kubeadm resetkubeadm initkubeadm join 对主机的更改恢复到之前状态 {{% /capture %}}