87 lines
3.0 KiB
Markdown
87 lines
3.0 KiB
Markdown
<h1><center>kubernetes集群添加新节点</center></h1>
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**作者：行癫（盗版必究）**
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------
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## 一：项目背景
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当现有的节点无法提供足够的CPU、内存或存储资源来运行更多的Pod时，添加新的节点可以增加集群的总资源池，从而支持更多的应用部署和服务；通过增加工作节点的数量，可以在某些节点失效时保证其他节点能够继续为用户提供服务，从而提高整个系统的高可用性和容错性。这对于生产环境中的关键任务应用尤为重要
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## 二：节点准备
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#### 第一部分
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1.修改所有节点的主机名 （规范）
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2.所有节点本地解析
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3.网络配置（所有节点全部使用静态地址）
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4.所有节点保证yum仓库可用 base epel https://developer.aliyun.com/mirror/
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5.所有节点关闭swap交换分区
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使用free -m 来判断 如果是没有swap交换分区 此步略过
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使用free -m 来判断 如果是有swap交换分区 swapoff -a 修改/etc/fstab 把swap的挂载去掉
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6.集群所有节点保持时间一致，不一致做时间同步
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#### 第二部分
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1.container runtime 所有节点 docker 安装
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略
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2.安装核心组件 kubelet 引导工具 kubeadm 命令行管理工具 kubectl 依赖包 ipvsadm
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需要指定版本安装(√)
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修改kubelet的配置文件(√)
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略
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3.加载内核模块 修改内核参数
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略
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#### 第三部分
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1.获取加入命令
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Master节点执行
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```shell
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[root@master ~]# kubeadm token create --print-join-command
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kubeadm join 10.9.12.234:6443 --token nu1g7p.w5sg414ekfm6hlcw --discovery-token-ca-cert-hash sha256:92d8500db9480e0159f47b959139a27c9efea0809c3fa7a9c98016b14dfe2bca
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```
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2.新节点执行加入
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```shell
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[root@node-4 ~]# kubeadm join 10.9.12.234:6443 --token nu1g7p.w5sg414ekfm6hlcw --discovery-token-ca-cert-hash sha256:92d8500db9480e0159f47b959139a27c9efea0809c3fa7a9c98016b14dfe2bca
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[preflight] Running pre-flight checks
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[WARNING SystemVerification]: this Docker version is not on the list of validated versions: 26.1.4. Latest validated version: 20.10
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[WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
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[preflight] Reading configuration from the cluster...
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[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -o yaml'
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[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
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[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
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[kubelet-start] Starting the kubelet
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[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...
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This node has joined the cluster:
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* Certificate signing request was sent to apiserver and a response was received.
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* The Kubelet was informed of the new secure connection details.
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Run 'kubectl get nodes' on the control-plane to see this node join the cluster.
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```
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3.主节点验证
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```shell
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[root@master ~]# kubectl get nodes
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```
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