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openeuler 22.03 lts sp4 使用 kubeadm 部署 k8s-v1.28.2 高可用集群

article 2024/11/16 13:40:19

文章目录

@[toc]
废话篇
这篇文章什么时候写的
为什么是 openeuler
为什么是 22.03 lts sp4
高可用架构
题外话

干活篇
环境介绍
系统初始化相关
关闭防火墙
关闭 selinux
关闭 swap
开启内核模块
开启模块自动加载服务

sysctl 内核参数调整
清空 iptables 规则
安装各种依赖和工具
修改 .bashrc 文件
安装 kubeadm 和 kubelet
简化 kubectl 命令
启动 kubelet

安装 containerd
镜像准备

部署 master 组件
集群初始化
安装 calico 网络插件
其他 master 节点加入集群
安装 nginx
安装 keepalived
构建 keepalived 镜像

切换成高可用访问
修改 controlPlaneEndpoint
修改 kubeconfig 证书
重启 master 组件
修改 kube-proxy 配置

worker 节点加入集群
更新十年证书
模拟节点故障

ABC 三类地址总结

废话篇

这篇文章什么时候写的

北京时间：2024年9月

为什么是 openeuler

centos 7 已经于 2024 年 06 月 30 日停止维护，国内又信创热潮，对于后期来说，谁也不知道形势会发生什么样的变化
目前国产操作系统有：openeuler（华为欧拉），anolis OS（阿里龙蜥），OpenCloudOS（腾讯），UOS（统信），kylin OS（银河麒麟/商业版的，开源版是 openkylin）
至于为什么选择了 openeuler，因为目前为止，只有 openeuler 不仅有 iso 镜像，还有 wsl，docker 镜像，甚至还支持公有云镜像，现在国内都没法直接访问 dockerhub 了，谁也不知道以后是不是连 docker 的基础镜像也会有干预，先提前有个准备

为什么是 22.03 lts sp4

因为 22.03 lts sp4 是 2024年6月份 的最新版本，生命周期也是持续到 2026 年的

高可用架构

如果是公有云服务器，可以直接买公有云的 lb 服务就好了，简单粗暴有人抓
如果是本地私有化，我这边使用的是 keepalived+nginx(stream 4层负载) 的架构来实现 apiserver 的高可用
本次实验是以容器的形式来部署 nginx 和 keepalived，主要目的是为了减少不同环境差异导致部署方式不同
下面的丑图来解释一下 ha 的场景
keepalived 使用 backup 的模式部署
VIP 所在机器的 keepalived 对当前节点的 nginx 做健康检测，通过对应端口负载到背后的 apiserver 服务
使用 nginx 的 steam 是为了节省机器的资源开支，用 upstream 属于七层负载，相较而言，资源使用会更高

在这里插入图片描述

题外话

当时本来想用静态 pod 的方式来运行 nginx 和 keepalived，后来发现，静态 pod 不支持 API 对象，只能放弃了，具体的查看 创建静态 Pod

下面的这个部署方式，也就适合测试环境使用，生产环境，不建议把高可用组件放到同一个 k8s 集群里面，最好是外面独立部署，包括 etcd 也可以考虑外置

干活篇

环境介绍

组件	版本
OS	openEuler 22.03 (LTS-SP4)
containerd	1.6.33
k8s	1.28.2-0
nerdctl	1.7.6
nginx	1.26.0
keepalived	2.3.1

机器 ip 和对应的服务

IP	HOSTNAME	SERVICE/ROLE
192.168.22.111	manager-k8s-cluster-01	k8s-master+k8s-worker+keepalived+nginx
192.168.22.112	manager-k8s-cluster-02	k8s-master+k8s-worker+keepalived+nginx
192.168.22.113	manager-k8s-cluster-03	k8s-master+k8s-worker+keepalived+nginx
192.168.22.114	manager-k8s-cluster-04	k8s-worker
192.168.22.115	manager-k8s-cluster-05	k8s-worker
192.168.22.200	/	VIP

系统初始化相关

如果是虚拟机还没就绪，可以先启动一台机器，执行完初始化后，直接克隆机器更方便快捷
如果机器已经就绪了，下面的初始化操作，每个机器都需要执行
下面的操作省略了静态 ip 和时间同步的操作，大家自己操作一下

关闭防火墙

systemctl disable firewalld --now

关闭 selinux

setenforce 0
sed -i '/SELINUX/s/enforcing/disabled/g' /etc/selinux/config

关闭 swap

swapoff -a
sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab

开启内核模块

# 针对于 kubeproxy 使用 ipvs 模式的
modprobe ip_vs
modprobe ip_vs_rr
modprobe ip_vs_wrr
modprobe ip_vs_sh
# 常规要开启的
modprobe nf_conntrack
modprobe br_netfilter
modprobe overlay

开启模块自动加载服务

cat > /etc/modules-load.d/k8s-modules.conf <<EOF
ip_vs
ip_vs_rr
ip_vs_wrr
ip_vs_sh
nf_conntrack
br_netfilter
overlay
EOF

设置为开机自启

systemctl enable systemd-modules-load --now

sysctl 内核参数调整

cat <<EOF > /etc/sysctl.d/kubernetes.conf
# 开启数据包转发功能（实现vxlan）
net.ipv4.ip_forward=1
# iptables对bridge的数据进行处理
net.bridge.bridge-nf-call-iptables=1
net.bridge.bridge-nf-call-ip6tables=1
net.bridge.bridge-nf-call-arptables=1
# 不允许将TIME-WAIT sockets重新用于新的TCP连接
net.ipv4.tcp_tw_reuse=0
# socket监听(listen)的backlog上限
net.core.somaxconn=32768
# 最大跟踪连接数，默认 nf_conntrack_buckets * 4
net.netfilter.nf_conntrack_max=1000000
# 禁止使用 swap 空间，只有当系统 OOM 时才允许使用它
vm.swappiness=0
# 计算当前的内存映射文件数。
vm.max_map_count=655360
# 内核可分配的最大文件数
fs.file-max=6553600
# 持久连接
net.ipv4.tcp_keepalive_time=600
net.ipv4.tcp_keepalive_intvl=30
net.ipv4.tcp_keepalive_probes=10
EOF

立即生效

sysctl -p /etc/sysctl.d/kubernetes.conf

清空 iptables 规则

iptables -F && \
iptables -X && \
iptables -F -t nat && \
iptables -X -t nat && \
iptables -P FORWARD ACCEPT

安装各种依赖和工具

yum install -y vim wget tar net-tools jq bash-completion tree bind-utils telnet unzip nc

修改 .bashrc 文件

具体参考我之前的博客：关于 openeuler 22.03-LTS-SP4 scp 失败问题的记录，主要影响的是 scp 命令，具体的，看大家自己选择

安装 kubeadm 和 kubelet

k8s 官方也没有 openeuler 的源，但是可以直接使用 kubernetes-el7 的源来安装，下面是配置 kubernetes-el7 源

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

安装 kubeadm 的时候，会自动安装 kubelet 和 kubectl 以及一些依赖的组件

yum install -y kubeadm-1.28.2-0

验证版本

kubeadm version

正常返回下面的内容，说明没问题

kubeadm version: &version.Info{Major:"1", Minor:"28", GitVersion:"v1.28.2", GitCommit:"89a4ea3e1e4ddd7f7572286090359983e0387b2f", GitTreeState:"clean", BuildDate:"2023-09-13T09:34:32Z", GoVersion:"go1.20.8", Compiler:"gc", Platform:"linux/amd64"}

简化 kubectl 命令

有时候实在懒得敲 kubectl 了，只想敲一个 k

ln -s /usr/bin/kubectl /usr/bin/k

启动 kubelet

配置开机自启

systemctl enable kubelet --now

安装 containerd

openeuler 可以用 docker 的 centos 里面的 rpm 来安装，这一点，还是比较方便的

cat <<EOF> /etc/yum.repos.d/docker.repo
[docker-ce-centos]
name=Docker CE Stable centos
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7.9/x86_64/stable
enabled=1
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg
EOF

安装 containerd

yum install -y containerd.io-1.6.33

生成默认的配置文件

containerd config default > /etc/containerd/config.toml

别的配置大家可以根据实际情况修改，国内的话，有一个参数可以修改，也可以不修改

sandbox_image 这个参数要指定 pause 镜像，默认的是 registry.k8s.io/pause:3.6，可以自己提前准备好镜像，然后修改成这个 tag，也可以和我一样，替换成国内阿里的
SystemdCgroup = false 这个参数需要修改，因为后面的 kubelet 也是用 systemd 这个 cgroup，默认导出的配置是 false，不配置会有下面的报错
openat2 /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-podf2248c8a5ab6855d0410a9f38c37b4a0.slice/cpuset.mems: no such file or directory

sandbox_image = "registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.9"
SystemdCgroup = true

启动 containerd，加入开机自启

systemctl enable containerd --now

配置 crictl 命令（安装 kubeadm 的时候，默认把 crictl 命令作为依赖下载了，需要通过配置文件，让 crictl 命令读取 containerd 的 socket 文件来达到管理 containerd 的目的）

crictl 命令默认的配置文件是 /etc/crictl.yaml，也可以自定义，使用 crictl 命令的时候加上 --config 来指定配置文件就可以了

echo 'runtime-endpoint: unix:///run/containerd/containerd.sock' > /etc/crictl.yaml

检查 crictl 和 containerd 的版本

crictl version

能展示下面的版本信息，说明部署和启动都没有问题了

Version:  0.1.0
RuntimeName:  containerd
RuntimeVersion:  1.6.33
RuntimeApiVersion:  v1

镜像准备

kubeadm 部署需要用到镜像，如果是内网环境，需要提前准备好镜像，然后导入镜像，用下面的命令可以查看需要提前准备哪些镜像

image-repository 就是后面 kubeadm 配置文件里面指定的，国内可以用下面的阿里云
kubernetes-version 是指定 k8s 的版本

kubeadm config images list \
--image-repository registry.cn-hangzhou.aliyuncs.com/google_containers \
--kubernetes-version 1.28.2

正常情况下，会输出下面这些内容

registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.28.2
registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.28.2
registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.28.2
registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.28.2
registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.9
registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.5.9-0
registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:v1.10.1

如果当前环境有网，网络可能不是很好，也可以提前用下面的命令先把镜像拉下来，这样不会在初始化阶段超时报错

kubeadm config images pull \
--image-repository registry.cn-hangzhou.aliyuncs.com/google_containers \
--kubernetes-version 1.28.2

拉取过程也会有下面这样的输出，到 coredns 说明镜像都拉取好了

[config/images] Pulled registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.28.2
[config/images] Pulled registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.28.2
[config/images] Pulled registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.28.2
[config/images] Pulled registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.28.2
[config/images] Pulled registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.9
[config/images] Pulled registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.5.9-0
[config/images] Pulled registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:v1.10.1

也可以提前把 calico 镜像准备好

ctr -n k8s.io image pull docker.io/calico/cni:v3.28.1
ctr -n k8s.io image pull docker.io/calico/node:v3.28.1
ctr -n k8s.io image pull docker.io/calico/kube-controllers:v3.28.1

初始化的操作，到这里就结束了

部署 master 组件

集群初始化

准备初始化的配置文件，相关的配置文件，可以从官方获取：Configuration APIs

# 集群相关的一些配置
## https://kubernetes.io/docs/reference/config-api/kubeadm-config.v1beta3/
apiVersion: kubeadm.k8s.io/v1beta3
bootstrapTokens:
- groups:
  - system:bootstrappers:kubeadm:default-node-token
  token: abcdef.0123456789abcdef
  ttl: 24h0m0s
  usages:
  - signing
  - authentication
kind: InitConfiguration
localAPIEndpoint:
  # apiserver 服务的 ip 地址和端口
  advertiseAddress: 192.168.22.111
  bindPort: 6443
nodeRegistration:
  # 容器运行时的选择
  criSocket: unix:///var/run/containerd/containerd.sock
  imagePullPolicy: IfNotPresent
  # k8s 的节点名称，也就是以后 kubectl get nodes 查看的名字
  ## 不指定的话，一般都是直接读取本机的 hostname
  ## 这里看个人习惯
  name: 192.168.22.111
  # 节点污点相关的，根据自己的情况配置
  taints: null
---
apiServer:
  # 高可用涉及到的 ip 地址属于额外的配置
  ## 需要在初始化的时候，加入到证书的 ip 清单里面
  certSANs:
  - 192.168.22.200
  timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta3
# k8s 相关证书的目录
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
# apiserver 的访问地址，先写当前节点的 ip
controlPlaneEndpoint: 192.168.22.111:6443
controllerManager: {}
dns: {}
etcd:
  local:
    # etcd 的数据持久化目录，尽量放 ssd 固态盘上面，etcd 比较在意磁盘 io
    dataDir: /var/lib/etcd
# 镜像仓库地址，官方默认是 registry.k8s.io，咱们国内可以写阿里的
imageRepository: registry.cn-hangzhou.aliyuncs.com/google_containers
kind: ClusterConfiguration
kubernetesVersion: 1.28.2
networking:
  # k8s dns 解析的域
  dnsDomain: cluster.local
  # k8s service 的网段
  serviceSubnet: 10.96.0.0/12
  # k8s pod 的网段
  ## 文章最后处会整理一下 ABC 三类地址的范围
  podSubnet: 172.22.0.0/16
scheduler: {}

# kubelet 相关的配置
## https://kubernetes.io/docs/reference/config-api/kubelet-config.v1beta1/
---
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
# 指定 cgroup 是 systemd
cgroupDriver: systemd
cgroupsPerQOS: true
# 配置容器的日志轮转
## 配置容器日志达到多少大小开始轮转，默认是 10Mi
containerLogMaxSize: 100Mi
## 配置容器日志轮转的最大文件数量，默认是 5
containerLogMaxFiles: 5

# kube-proxy 相关的配置
## https://kubernetes.io/docs/reference/config-api/kube-proxy-config.v1alpha1/
---
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
# 代理模式，只有 iptables 和 ipvs 可选，windows 用 kernelspace
mode: iptables

通过配置文件初始化集群

kubeadm init --config kubeadm.yaml

返回类似下面的内容，说明集群已经初始化完成了

Your Kubernetes control-plane has initialized successfully!

To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

Alternatively, if you are the root user, you can run:

  export KUBECONFIG=/etc/kubernetes/admin.conf

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  https://kubernetes.io/docs/concepts/cluster-administration/addons/

You can now join any number of control-plane nodes by copying certificate authorities
and service account keys on each node and then running the following as root:

  kubeadm join 192.168.22.111:6443 --token abcdef.0123456789abcdef \
        --discovery-token-ca-cert-hash sha256:592a0811d0c53cbafbeedec9899b95b494da2c0456cc3ef65ef2533ddfa26c25 \
        --control-plane

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join 192.168.22.111:6443 --token abcdef.0123456789abcdef \
        --discovery-token-ca-cert-hash sha256:592a0811d0c53cbafbeedec9899b95b494da2c0456cc3ef65ef2533ddfa26c25

安装 calico 网络插件

官方的 yaml 在 github 上有，可以 clone 到本地，然后获取到这个 yaml 文件，里面有内容需要修改

取消 CALICO_IPV4POOL_CIDR 的注释，值就是 kubeadm 初始化文件里面的 podSubnet
增加 IP_AUTODETECTION_METHOD 指定一下网卡，如果本地多网卡，可能会有一些不知名的问题存在

            - name: CALICO_IPV4POOL_CIDR
              value: "172.22.0.0/16"
            - name: IP_AUTODETECTION_METHOD
              value: "interface=ens3"

apply 完 yaml 后，检查 pod 是否都正常启动

kubectl get pod -n kube-system

calico 这些都是 running 的就可以了

NAME                                      READY   STATUS    RESTARTS        AGE
calico-kube-controllers-97d84d657-bjlkx   1/1     Running   0               29s
calico-node-gppdv                         1/1     Running   0               29s

验证集群是否正常

kubectl get nodes

节点都是 ready 就可以了

NAME            STATUS   ROLES           AGE     VERSION
192.168.22.111   Ready    control-plane   9m29s   v1.28.2

其他 master 节点加入集群

剩下的 master 节点都要执行

mkdir -p /etc/kubernetes/pki/etcd

分发证书

# 分发给 192.168.22.112 节点
scp /etc/kubernetes/pki/{ca.crt,ca.key,sa.key,sa.pub,front-proxy-ca.crt,front-proxy-ca.key} 192.168.22.112:/etc/kubernetes/pki/
scp /etc/kubernetes/pki/etcd/{ca.crt,ca.key} 192.168.22.112:/etc/kubernetes/pki/etcd/
# 分发给 192.168.22.113 节点
scp /etc/kubernetes/pki/{ca.crt,ca.key,sa.key,sa.pub,front-proxy-ca.crt,front-proxy-ca.key} 192.168.22.113:/etc/kubernetes/pki/
scp /etc/kubernetes/pki/etcd/{ca.crt,ca.key} 192.168.22.113:/etc/kubernetes/pki/etcd/

通过上面初始化完成后给出的 join 命令来加入，下面的命令，分别在各自的 master 节点执行

# 192.168.22.112 节点执行
kubeadm join 192.168.22.111:6443 --token abcdef.0123456789abcdef \
        --discovery-token-ca-cert-hash sha256:592a0811d0c53cbafbeedec9899b95b494da2c0456cc3ef65ef2533ddfa26c25 \
        --control-plane \
        --node-name 192.168.22.112
# 192.168.22.113 节点执行
kubeadm join 192.168.22.111:6443 --token abcdef.0123456789abcdef \
        --discovery-token-ca-cert-hash sha256:592a0811d0c53cbafbeedec9899b95b494da2c0456cc3ef65ef2533ddfa26c25 \
        --control-plane \
        --node-name 192.168.22.113

返回类似下面的输出，说明加入集群成功了

This node has joined the cluster and a new control plane instance was created:

* Certificate signing request was sent to apiserver and approval was received.
* The Kubelet was informed of the new secure connection details.
* Control plane label and taint were applied to the new node.
* The Kubernetes control plane instances scaled up.
* A new etcd member was added to the local/stacked etcd cluster.

To start administering your cluster from this node, you need to run the following as a regular user:

        mkdir -p $HOME/.kube
        sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
        sudo chown $(id -u):$(id -g) $HOME/.kube/config

Run 'kubectl get nodes' to see this node join the cluster.

安装 nginx

这个 nginx 是用来对 apisever 做负载均衡的，这里先把节点的污点去了，不然 master 节点没法运行 pod

kubectl taint node --all node-role.kubernetes.io/control-plane-

创建 namespace

k create ns ha

下面是完整的 yaml 文件，包括了 namespace，configmap，deployment，里面的 ip 要注意换成自己本地的 ip，我这里就启动了两个 nginx

---
apiVersion: v1
data:
  nginx.conf: |
    worker_processes 1;
    events {
        worker_connections  1024;
    }
    stream {
        upstream k8s-apiserver {
            hash $remote_addr consistent;
            server 192.168.22.111:6443 max_fails=3 fail_timeout=30s;
            server 192.168.22.112:6443 max_fails=3 fail_timeout=30s;
            server 192.168.22.113:6443 max_fails=3 fail_timeout=30s;
        }

        server {
            listen       *:8443;
            proxy_connect_timeout 120s;
            proxy_pass k8s-apiserver;
        }
    }
kind: ConfigMap
metadata:
  name: nginx-lb-apiserver-cm
  namespace: ha
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: nginx-lb-apiserver
  name: nginx-lb-apiserver
  namespace: ha
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx-lb-apiserver
  template:
    metadata:
      labels:
        app: nginx-lb-apiserver
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: kubernetes.io/hostname
                operator: In
                values:
                - 192.168.22.111
                - 192.168.22.112
                - 192.168.22.113
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
          - labelSelector:
              matchExpressions:
              - key: app
                operator: In
                values:
                - nginx-lb-apiserver
            topologyKey: kubernetes.io/hostname
      containers:
      - image: docker.m.daocloud.io/nginx:1.26.0
        imagePullPolicy: IfNotPresent
        name: nginx-lb-apiserver
        resources:
          limits:
            cpu: 1000m
            memory: 500Mi
          requests:
            cpu: 100m
            memory: 100Mi
        volumeMounts:
        - mountPath: /etc/nginx
          name: config
      hostNetwork: true
      volumes:
      - configMap:
          name: nginx-lb-apiserver-cm
        name: config

安装 keepalived

高可用组件采用 k8s pod 的形式部署，containerd 构建镜像比较麻烦，可以找个有 docker 的环境构建，然后导入镜像

构建 keepalived 镜像

Dockerfile

FROM docker.m.daocloud.io/debian:stable-20240904-slim

ENV LANG="en_US.UTF-8"
ENV LANGUAGE="en_US:en"
ENV LC_ALL="en_US.UTF-8"
ENV KEEPALIVED_VERSION="2.3.1"

RUN sed -i.bak 's/deb.debian.org/mirrors.aliyun.com/g' /etc/apt/sources.list.d/debian.sources && \
    apt-get update && \
    apt-get install -y autoconf \
    make \
    curl \
    gcc \
    ipset \
    iptables \
    musl-dev \
    openssl \
    libssl-dev \
    net-tools \
    ncat \
    && curl -o keepalived.tar.gz -SL https://keepalived.org/software/keepalived-${KEEPALIVED_VERSION}.tar.gz \
    && tar xf keepalived.tar.gz \
    && cd keepalived-${KEEPALIVED_VERSION} \
    && ./configure --disable-dynamic-linking \
    && make \
    && make install \
    && rm -f /keepalived.tar.gz \
    && apt-get remove -y musl-dev \
       libssl-dev \
       make \
       && apt-get -ys clean

构建镜像

docker build -t keepalived-2.3.1:debian-20240904-slim .

导出镜像

docker save keepalived-2.3.1:debian-20240904-slim > keepalived-2.3.1_debian-20240904-slim.tar

分发镜像到 master 节点

scp keepalived-2.3.1_debian-20240904-slim.tar 192.168.22.111:/tmp/
scp keepalived-2.3.1_debian-20240904-slim.tar 192.168.22.112:/tmp/
scp keepalived-2.3.1_debian-20240904-slim.tar 192.168.22.113:/tmp/

k8s 集群导入镜像

ctr -n k8s.io image import /tmp/keepalived-2.3.1_debian-20240904-slim.tar

下面的 yaml 里面的 ip 地址和 ens3 网卡名字修改成自己环境的就可以了，下面的 image 名字也是上面构建的镜像名字，如果有不一样的，也要修改

---
apiVersion: v1
data:
  keepalived.conf: |
    global_defs {
    }

    vrrp_script chk_nginx  {
        script "/etc/keepalived/chk_health/chk_nginx.sh"
        interval 2
        fall 3
        rise 2
        timeout 3
    }

    vrrp_instance VI_1 {
        state BACKUP
        interface ens3
        virtual_router_id 100
        priority 100
        advert_int 1
        authentication {
            auth_type PASS
            auth_pass keep@lived
        }

        virtual_ipaddress {
            192.168.22.200
        }

        track_interface {
            ens3
        }

        nopreempt

        track_script {
            chk_nginx
        }
    }
kind: ConfigMap
metadata:
  name: keepalived-ha-apiserver-cm
  namespace: ha
---
apiVersion: v1
data:
  chk_nginx.sh: |
    #!/bin/bash
    exitNum=0

    while true
    do
      if ! nc -z 127.0.0.1 8443; then
        let exitNum++
        sleep 3
        [ ${exitNum} -lt 3 ] || exit 1
      else
        exit 0
      fi
    done
kind: ConfigMap
metadata:
  name: keepalived-ha-apiserver-chk-cm
  namespace: ha
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: keepalived-ha-apiserver
  name: keepalived-ha-apiserver
  namespace: ha
spec:
  replicas: 3
  selector:
    matchLabels:
      app: keepalived-ha-apiserver
  template:
    metadata:
      labels:
        app: keepalived-ha-apiserver
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: kubernetes.io/hostname
                operator: In
                values:
                - 192.168.22.111
                - 192.168.22.112
                - 192.168.22.113
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
          - labelSelector:
              matchExpressions:
              - key: app
                operator: In
                values:
                - keepalived-ha-apiserver
            topologyKey: kubernetes.io/hostname
      containers:
      - args:
        - -c
        - /usr/local/sbin/keepalived -n -l -f /etc/keepalived/keepalived.conf
        command:
        - bash
        image: keepalived-2.3.1:debian-20240904-slim
        imagePullPolicy: IfNotPresent
        name: keepalived-ha-apiserver
        securityContext:
          capabilities:
            add:
            - NET_ADMIN
        volumeMounts:
        - mountPath: /etc/keepalived
          name: config
        - mountPath: /etc/keepalived/chk_health
          name: chekscript
      hostNetwork: true
      volumes:
      - configMap:
          name: keepalived-ha-apiserver-cm
        name: config
      - configMap:
          defaultMode: 493
          name: keepalived-ha-apiserver-chk-cm
        name: chekscript

验证 vip 是否通了，这里使用 vip+nginx 的端口来验证

nc -zv 192.168.22.200 8443

返回类似下面的输出说明网络是通的

Ncat: Version 7.92 ( https://nmap.org/ncat )
Ncat: Connected to 192.168.22.200:8443.
Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.

切换成高可用访问

修改 controlPlaneEndpoint

在 init 节点操作以下命令修改 kubeadm-config 里面的 controlPlaneEndpoint 地址

kubectl edit cm -n kube-system kubeadm-config

修改成 vip 的地址

controlPlaneEndpoint: 192.168.22.200:8443

修改 kubeconfig 证书

以下操作，三个 master 节点都需要执行

替换 kubeconfig 文件中的 apiserver 地址，可以注释掉老的，然后写一个新的

admin.conf
controller-manager.conf
kubelet.conf
scheduler.conf

    server: https://192.168.22.200:8443
    # server: https://192.168.22.111:6443

重启 master 组件

只需要逐个节点重启 controller-manager，scheduler，kubelet 来验证

mv /etc/kubernetes/manifests/kube-scheduler.yaml .
# 可以等待一会，或者执行 crictl ps 看看是否有 scheduler 的容器存在
mv kube-scheduler.yaml /etc/kubernetes/manifests/
mv /etc/kubernetes/manifests/kube-controller-manager.yaml .
# 可以等待一会，或者执行 crictl ps 看看是否有 scheduler 的容器存在
mv kube-controller-manager.yaml /etc/kubernetes/manifests/
systemctl restart kubelet

重启完成后，执行下面的命令，看看是否能正常获取节点信息，可以正常获取就没问题了

kubectl get node --kubeconfig /etc/kubernetes/admin.conf

修改 kube-proxy 配置

用其中一个节点操作就可以了

k edit cm -n kube-system kube-proxy

主要修改 server 这块

  kubeconfig.conf: |-
    apiVersion: v1
    kind: Config
    clusters:
    - cluster:
        certificate-authority: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
        server: https://192.168.22.200:8443
        # server: https://192.168.22.111:6443
      name: default

重启 kube-proxy

k get pod -n kube-system | awk '/kube-proxy/ {print $1}' | xargs k delete pod -n kube-system

worker 节点加入集群

生成 join 命令

kubeadm token create --print-join-command --ttl=0

正常情况会返回类似下面的内容，就可以在其他的 worker 节点去执行了

kubeadm join 192.168.22.200:8443 --token lkuzqm.0kzboiy72rryp3fb --discovery-token-ca-cert-hash sha256:592a0811d0c53cbafbeedec9899b95b494da2c0456cc3ef65ef2533ddfa26c25

下面是我加入的两个节点

kubeadm join 192.168.22.200:8443 --token lkuzqm.0kzboiy72rryp3fb \
        --discovery-token-ca-cert-hash sha256:592a0811d0c53cbafbeedec9899b95b494da2c0456cc3ef65ef2533ddfa26c25 \
        --node-name 192.168.22.114
kubeadm join 192.168.22.200:8443 --token lkuzqm.0kzboiy72rryp3fb \
        --discovery-token-ca-cert-hash sha256:592a0811d0c53cbafbeedec9899b95b494da2c0456cc3ef65ef2533ddfa26c25 \
        --node-name 192.168.22.115

更新十年证书

这里使用 github 上一个大佬写的脚本来更新证书，不采用编译 kubeadm 的方式，相对方便很多

update-kube-cert
这个脚本的简要逻辑就是从当前集群的 k8s 证书里面通过 openssl 命令去读取一些相关的内容，基于之前的 ca 根证书（kubeadm 默认的 ca 证书是10年的，只是各个组件的证书只配置了一年）来重新生成各个组件的证书
如果访问 github 有问题的，可以直接复制下面的脚本内容

#!/usr/bin/env bash

set -o errexit
set -o pipefail
# set -o xtrace

# set output color
NC='\033[0m'
RED='\033[31m'
GREEN='\033[32m'
YELLOW='\033[33m'
BLUE='\033[34m'
# set default cri
CRI="docker"

log::err() {
  printf "[$(date +'%Y-%m-%dT%H:%M:%S.%2N%z')][${RED}ERROR${NC}] %b\n" "$@"
}

log::info() {
  printf "[$(date +'%Y-%m-%dT%H:%M:%S.%2N%z')][INFO] %b\n" "$@"
}

log::warning() {
  printf "[$(date +'%Y-%m-%dT%H:%M:%S.%2N%z')][${YELLOW}WARNING${NC}] \033[0m%b\n" "$@"
}

check_file() {
  if [[ ! -r ${1} ]]; then
    log::err "can not find ${1}"
    exit 1
  fi
}

# get x509v3 subject alternative name from the old certificate
cert::get_subject_alt_name() {
  local cert=${1}.crt
  local alt_name

  check_file "${cert}"
  alt_name=$(openssl x509 -text -noout -in "${cert}" | grep -A1 'Alternative' | tail -n1 | sed 's/[[:space:]]*Address//g')
  printf "%s\n" "${alt_name}"
}

# get subject from the old certificate
cert::get_subj() {
  local cert=${1}.crt
  local subj

  check_file "${cert}"
  subj=$(openssl x509 -text -noout -in "${cert}" | grep "Subject:" | sed 's/Subject:/\//g;s/\,/\//;s/[[:space:]]//g')
  printf "%s\n" "${subj}"
}

cert::backup_file() {
  local file=${1}
  if [[ ! -e ${file}.old-$(date +%Y%m%d) ]]; then
    cp -rp "${file}" "${file}.old-$(date +%Y%m%d)"
    log::info "backup ${file} to ${file}.old-$(date +%Y%m%d)"
  else
    log::warning "does not backup, ${file}.old-$(date +%Y%m%d) already exists"
  fi
}

# check certificate expiration
cert::check_cert_expiration() {
  local cert=${1}.crt
  local cert_expires

  cert_expires=$(openssl x509 -text -noout -in "${cert}" | awk -F ": " '/Not After/{print$2}')
  printf "%s\n" "${cert_expires}"
}

# check kubeconfig expiration
cert::check_kubeconfig_expiration() {
  local config=${1}.conf
  local cert
  local cert_expires

  cert=$(grep "client-certificate-data" "${config}" | awk '{print$2}' | base64 -d)
  cert_expires=$(openssl x509 -text -noout -in <(printf "%s" "${cert}") | awk -F ": " '/Not After/{print$2}')
  printf "%s\n" "${cert_expires}"
}

# check etcd certificates expiration
cert::check_etcd_certs_expiration() {
  local cert
  local certs

  certs=(
    "${ETCD_CERT_CA}"
    "${ETCD_CERT_SERVER}"
    "${ETCD_CERT_PEER}"
    "${ETCD_CERT_HEALTHCHECK_CLIENT}"
    "${ETCD_CERT_APISERVER_ETCD_CLIENT}"
  )

  for cert in "${certs[@]}"; do
    if [[ ! -r ${cert} ]]; then
      printf "%-50s%-30s\n" "${cert}.crt" "$(cert::check_cert_expiration "${cert}")"
    fi
  done
}

# check master certificates expiration
cert::check_master_certs_expiration() {
  local certs
  local kubeconfs
  local cert
  local conf

  certs=(
    "${CERT_CA}"
    "${CERT_APISERVER}"
    "${CERT_APISERVER_KUBELET_CLIENT}"
    "${FRONT_PROXY_CA}"
    "${FRONT_PROXY_CLIENT}"
  )

  # add support for super_admin.conf, which was added after k8s v1.30.
  if [ -f "${CONF_SUPER_ADMIN}.conf" ]; then
    kubeconfs=(
      "${CONF_CONTROLLER_MANAGER}"
      "${CONF_SCHEDULER}"
      "${CONF_ADMIN}"
      "${CONF_SUPER_ADMIN}"
    )
  else 
    kubeconfs=(
      "${CONF_CONTROLLER_MANAGER}"
      "${CONF_SCHEDULER}"
      "${CONF_ADMIN}"
    )
  fi

  printf "%-50s%-30s\n" "CERTIFICATE" "EXPIRES"

  for conf in "${kubeconfs[@]}"; do
    if [[ ! -r ${conf} ]]; then
      printf "%-50s%-30s\n" "${conf}.config" "$(cert::check_kubeconfig_expiration "${conf}")"
    fi
  done

  for cert in "${certs[@]}"; do
    if [[ ! -r ${cert} ]]; then
      printf "%-50s%-30s\n" "${cert}.crt" "$(cert::check_cert_expiration "${cert}")"
    fi
  done
}

# check all certificates expiration
cert::check_all_expiration() {
  cert::check_master_certs_expiration
  cert::check_etcd_certs_expiration
}

# generate certificate whit client, server or peer
# Args:
#   $1 (the name of certificate)
#   $2 (the type of certificate, must be one of client, server, peer)
#   $3 (the subject of certificates)
#   $4 (the validity of certificates) (days)
#   $5 (the name of ca)
#   $6 (the x509v3 subject alternative name of certificate when the type of certificate is server or peer)
cert::gen_cert() {
  local cert_name=${1}
  local cert_type=${2}
  local subj=${3}
  local cert_days=${4}
  local ca_name=${5}
  local alt_name=${6}
  local ca_cert=${ca_name}.crt
  local ca_key=${ca_name}.key
  local cert=${cert_name}.crt
  local key=${cert_name}.key
  local csr=${cert_name}.csr
  local common_csr_conf='distinguished_name = dn\n[dn]\n[v3_ext]\nkeyUsage = critical, digitalSignature, keyEncipherment\n'

  for file in "${ca_cert}" "${ca_key}" "${cert}" "${key}"; do
    check_file "${file}"
  done

  case "${cert_type}" in
  client)
    csr_conf=$(printf "%bextendedKeyUsage = clientAuth\n" "${common_csr_conf}")
    ;;
  server)
    csr_conf=$(printf "%bextendedKeyUsage = serverAuth\nsubjectAltName = %b\n" "${common_csr_conf}" "${alt_name}")
    ;;
  peer)
    csr_conf=$(printf "%bextendedKeyUsage = serverAuth, clientAuth\nsubjectAltName = %b\n" "${common_csr_conf}" "${alt_name}")
    ;;
  *)
    log::err "unknow, unsupported certs type: ${YELLOW}${cert_type}${NC}, supported type: client, server, peer"
    exit 1
    ;;
  esac

  # gen csr
  openssl req -new -key "${key}" -subj "${subj}" -reqexts v3_ext \
    -config <(printf "%b" "${csr_conf}") \
    -out "${csr}" >/dev/null 2>&1
  # gen cert
  openssl x509 -in "${csr}" -req -CA "${ca_cert}" -CAkey "${ca_key}" -CAcreateserial -extensions v3_ext \
    -extfile <(printf "%b" "${csr_conf}") \
    -days "${cert_days}" -out "${cert}" >/dev/null 2>&1

  rm -f "${csr}"
}

cert::update_kubeconf() {
  local cert_name=${1}
  local kubeconf_file=${cert_name}.conf
  local cert=${cert_name}.crt
  local key=${cert_name}.key
  local subj
  local cert_base64

  check_file "${kubeconf_file}"
  # get the key from the old kubeconf
  grep "client-key-data" "${kubeconf_file}" | awk '{print$2}' | base64 -d >"${key}"
  # get the old certificate from the old kubeconf
  grep "client-certificate-data" "${kubeconf_file}" | awk '{print$2}' | base64 -d >"${cert}"
  # get subject from the old certificate
  subj=$(cert::get_subj "${cert_name}")
  cert::gen_cert "${cert_name}" "client" "${subj}" "${CERT_DAYS}" "${CERT_CA}"
  # get certificate base64 code
  cert_base64=$(base64 -w 0 "${cert}")

  # set certificate base64 code to kubeconf
  sed -i 's/client-certificate-data:.*/client-certificate-data: '"${cert_base64}"'/g' "${kubeconf_file}"

  rm -f "${cert}"
  rm -f "${key}"
}

cert::update_etcd_cert() {
  local subj
  local subject_alt_name
  local cert

  # generate etcd server,peer certificate
  # /etc/kubernetes/pki/etcd/server
  # /etc/kubernetes/pki/etcd/peer
  for cert in ${ETCD_CERT_SERVER} ${ETCD_CERT_PEER}; do
    subj=$(cert::get_subj "${cert}")
    subject_alt_name=$(cert::get_subject_alt_name "${cert}")
    cert::gen_cert "${cert}" "peer" "${subj}" "${CERT_DAYS}" "${ETCD_CERT_CA}" "${subject_alt_name}"
    log::info "${GREEN}updated ${BLUE}${cert}.conf${NC}"
  done

  # generate etcd healthcheck-client,apiserver-etcd-client certificate
  # /etc/kubernetes/pki/etcd/healthcheck-client
  # /etc/kubernetes/pki/apiserver-etcd-client
  for cert in ${ETCD_CERT_HEALTHCHECK_CLIENT} ${ETCD_CERT_APISERVER_ETCD_CLIENT}; do
    subj=$(cert::get_subj "${cert}")
    cert::gen_cert "${cert}" "client" "${subj}" "${CERT_DAYS}" "${ETCD_CERT_CA}"
    log::info "${GREEN}updated ${BLUE}${cert}.conf${NC}"
  done

  # restart etcd
  case $CRI in
    "docker")
      docker ps | awk '/k8s_etcd/{print$1}' | xargs -r -I '{}' docker restart {} >/dev/null 2>&1 || true
      ;;
    "containerd")
      crictl ps | awk '/etcd-/{print$(NF-1)}' | xargs -r -I '{}' crictl stopp {} >/dev/null 2>&1 || true
      ;;
  esac
  log::info "restarted etcd with ${CRI}"
}

cert::update_master_cert() {
  local subj
  local subject_alt_name
  local conf

  # generate apiserver server certificate
  # /etc/kubernetes/pki/apiserver
  subj=$(cert::get_subj "${CERT_APISERVER}")
  subject_alt_name=$(cert::get_subject_alt_name "${CERT_APISERVER}")
  cert::gen_cert "${CERT_APISERVER}" "server" "${subj}" "${CERT_DAYS}" "${CERT_CA}" "${subject_alt_name}"
  log::info "${GREEN}updated ${BLUE}${CERT_APISERVER}.crt${NC}"

  # generate apiserver-kubelet-client certificate
  # /etc/kubernetes/pki/apiserver-kubelet-client
  subj=$(cert::get_subj "${CERT_APISERVER_KUBELET_CLIENT}")
  cert::gen_cert "${CERT_APISERVER_KUBELET_CLIENT}" "client" "${subj}" "${CERT_DAYS}" "${CERT_CA}"
  log::info "${GREEN}updated ${BLUE}${CERT_APISERVER_KUBELET_CLIENT}.crt${NC}"

  # generate kubeconf for controller-manager,scheduler and kubelet
  # /etc/kubernetes/controller-manager,scheduler,admin,kubelet.conf,super_admin(added after k8s v1.30.)

  if [ -f "${CONF_SUPER_ADMIN}.conf" ]; then
    conf_list="${CONF_CONTROLLER_MANAGER} ${CONF_SCHEDULER} ${CONF_ADMIN} ${CONF_KUBELET} ${CONF_SUPER_ADMIN}"
  else 
    conf_list="${CONF_CONTROLLER_MANAGER} ${CONF_SCHEDULER} ${CONF_ADMIN} ${CONF_KUBELET}"
  fi
  
  for conf in ${conf_list}; do
    if [[ ${conf##*/} == "kubelet" ]]; then
      # https://github.com/kubernetes/kubeadm/issues/1753
      set +e
      grep kubelet-client-current.pem /etc/kubernetes/kubelet.conf >/dev/null 2>&1
      kubelet_cert_auto_update=$?
      set -e
      if [[ "$kubelet_cert_auto_update" == "0" ]]; then
        log::info "does not need to update kubelet.conf"
        continue
      fi
    fi

    # update kubeconf
    cert::update_kubeconf "${conf}"
    log::info "${GREEN}updated ${BLUE}${conf}.conf${NC}"

    # copy admin.conf to ${HOME}/.kube/config
    if [[ ${conf##*/} == "admin" ]]; then
      mkdir -p "${HOME}/.kube"
      local config=${HOME}/.kube/config
      local config_backup
      config_backup=${HOME}/.kube/config.old-$(date +%Y%m%d)
      if [[ -f ${config} ]] && [[ ! -f ${config_backup} ]]; then
        cp -fp "${config}" "${config_backup}"
        log::info "backup ${config} to ${config_backup}"
      fi
      cp -fp "${conf}.conf" "${HOME}/.kube/config"
      log::info "copy the admin.conf to ${HOME}/.kube/config"
    fi
  done

  # generate front-proxy-client certificate
  # /etc/kubernetes/pki/front-proxy-client
  subj=$(cert::get_subj "${FRONT_PROXY_CLIENT}")
  cert::gen_cert "${FRONT_PROXY_CLIENT}" "client" "${subj}" "${CERT_DAYS}" "${FRONT_PROXY_CA}"
  log::info "${GREEN}updated ${BLUE}${FRONT_PROXY_CLIENT}.crt${NC}"

  # restart apiserver, controller-manager, scheduler and kubelet
  for item in "apiserver" "controller-manager" "scheduler"; do
    case $CRI in
      "docker")
        docker ps | awk '/k8s_kube-'${item}'/{print$1}' | xargs -r -I '{}' docker restart {} >/dev/null 2>&1 || true
        ;;
      "containerd")
        crictl ps | awk '/kube-'${item}'-/{print $(NF-1)}' | xargs -r -I '{}' crictl stopp {} >/dev/null 2>&1 || true
        ;;
    esac
    log::info "restarted ${item} with ${CRI}"
  done
  systemctl restart kubelet || true
  log::info "restarted kubelet"
}

main() {
  local node_type=$1

  # read the options
  ARGS=`getopt -o c: --long cri: -- "$@"`
  eval set -- "$ARGS"
  # extract options and their arguments into variables.
  while true
  do
    case "$1" in
      -c|--cri)
        case "$2" in
          "docker"|"containerd")
            CRI=$2
            shift 2
            ;;
          *)
            echo 'Unsupported cri. Valid options are "docker", "containerd".'
            exit 1
            ;;
        esac
        ;;
      --)
        shift
        break
        ;;
      *)
        echo "Invalid arguments."
        exit 1
        ;;
    esac
  done

  CERT_DAYS=3650

  KUBE_PATH=/etc/kubernetes
  PKI_PATH=${KUBE_PATH}/pki

  # master certificates path
  # apiserver
  CERT_CA=${PKI_PATH}/ca
  CERT_APISERVER=${PKI_PATH}/apiserver
  CERT_APISERVER_KUBELET_CLIENT=${PKI_PATH}/apiserver-kubelet-client
  CONF_CONTROLLER_MANAGER=${KUBE_PATH}/controller-manager
  CONF_SCHEDULER=${KUBE_PATH}/scheduler
  CONF_ADMIN=${KUBE_PATH}/admin
  CONF_SUPER_ADMIN=${KUBE_PATH}/super-admin
  CONF_KUBELET=${KUBE_PATH}/kubelet
  # front-proxy
  FRONT_PROXY_CA=${PKI_PATH}/front-proxy-ca
  FRONT_PROXY_CLIENT=${PKI_PATH}/front-proxy-client

  # etcd certificates path
  ETCD_CERT_CA=${PKI_PATH}/etcd/ca
  ETCD_CERT_SERVER=${PKI_PATH}/etcd/server
  ETCD_CERT_PEER=${PKI_PATH}/etcd/peer
  ETCD_CERT_HEALTHCHECK_CLIENT=${PKI_PATH}/etcd/healthcheck-client
  ETCD_CERT_APISERVER_ETCD_CLIENT=${PKI_PATH}/apiserver-etcd-client

  case ${node_type} in
  # etcd)
  # # update etcd certificates
  #   cert::update_etcd_cert
  # ;;
  master)
    # check certificates expiration
    cert::check_master_certs_expiration
    # backup $KUBE_PATH to $KUBE_PATH.old-$(date +%Y%m%d)
    cert::backup_file "${KUBE_PATH}"
    # update master certificates and kubeconf
    log::info "${GREEN}updating...${NC}"
    cert::update_master_cert
    log::info "${GREEN}done!!!${NC}"
    # check certificates expiration after certificates updated
    cert::check_master_certs_expiration
    ;;
  all)
    # check certificates expiration
    cert::check_all_expiration
    # backup $KUBE_PATH to $KUBE_PATH.old-$(date +%Y%m%d)
    cert::backup_file "${KUBE_PATH}"
    # update etcd certificates
    log::info "${GREEN}updating...${NC}"
    cert::update_etcd_cert
    # update master certificates and kubeconf
    cert::update_master_cert
    log::info "${GREEN}done!!!${NC}"
    # check certificates expiration after certificates updated
    cert::check_all_expiration
    ;;
  check)
    # check certificates expiration
    cert::check_all_expiration
    ;;
  *)
    log::err "unknown, unsupported cert type: ${node_type}, supported type: \"all\", \"master\""
    printf "Documentation: https://github.com/yuyicai/update-kube-cert
  example:
    '\033[32m./update-kubeadm-cert.sh all\033[0m' update all etcd certificates, master certificates and kubeconf
      /etc/kubernetes
      ├── admin.conf
      ├── super-admin.conf
      ├── controller-manager.conf
      ├── scheduler.conf
      ├── kubelet.conf
      └── pki
          ├── apiserver.crt
          ├── apiserver-etcd-client.crt
          ├── apiserver-kubelet-client.crt
          ├── front-proxy-client.crt
          └── etcd
              ├── healthcheck-client.crt
              ├── peer.crt
              └── server.crt

    '\033[32m./update-kubeadm-cert.sh master\033[0m' update only master certificates and kubeconf
      /etc/kubernetes
      ├── admin.conf
      ├── super-admin.conf
      ├── controller-manager.conf
      ├── scheduler.conf
      ├── kubelet.conf
      └── pki
          ├── apiserver.crt
          ├── apiserver-kubelet-client.crt
          └── front-proxy-client.crt
"
    exit 1
    ;;
  esac
}

main "$@"

脚本需要在所有的 master 节点执行

bash update-kubeadm-cert.sh all --cri containerd

可以检查一下证书的到期时间

kubeadm certs check-expiration

可以看到，都是十年后到期了

CERTIFICATE                EXPIRES                  RESIDUAL TIME   CERTIFICATE AUTHORITY   EXTERNALLY MANAGED
admin.conf                 Sep 13, 2034 13:01 UTC   9y              ca                      no
apiserver                  Sep 13, 2034 13:01 UTC   9y              ca                      no
apiserver-etcd-client      Sep 13, 2034 13:01 UTC   9y              etcd-ca                 no
apiserver-kubelet-client   Sep 13, 2034 13:01 UTC   9y              ca                      no
controller-manager.conf    Sep 13, 2034 13:01 UTC   9y              ca                      no
etcd-healthcheck-client    Sep 13, 2034 13:01 UTC   9y              etcd-ca                 no
etcd-peer                  Sep 13, 2034 13:01 UTC   9y              etcd-ca                 no
etcd-server                Sep 13, 2034 13:01 UTC   9y              etcd-ca                 no
front-proxy-client         Sep 13, 2034 13:01 UTC   9y              front-proxy-ca          no
scheduler.conf             Sep 13, 2034 13:01 UTC   9y              ca                      no

CERTIFICATE AUTHORITY   EXPIRES                  RESIDUAL TIME   EXTERNALLY MANAGED
ca                      Sep 13, 2034 11:08 UTC   9y              no
etcd-ca                 Sep 13, 2034 11:08 UTC   9y              no
front-proxy-ca          Sep 13, 2034 11:08 UTC   9y              no

到这里，整个高可用的 k8s 集群就部署完成了

模拟节点故障

通过 ip a 命令看看哪个节点有 vip 存在

2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 52:54:00:08:f7:18 brd ff:ff:ff:ff:ff:ff
    inet 192.168.22.113/24 brd 192.168.22.255 scope global noprefixroute ens3
       valid_lft forever preferred_lft forever
    inet 192.168.22.200/32 scope global ens3
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:fe08:f718/64 scope link
       valid_lft forever preferred_lft forever

我直接把这个节点关机来模拟节点故障，我们去另一个节点，查看 vip 是不是来了

2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 52:54:00:88:e7:0d brd ff:ff:ff:ff:ff:ff
    inet 192.168.22.112/24 brd 192.168.22.255 scope global noprefixroute ens3
       valid_lft forever preferred_lft forever
    inet 192.168.22.200/32 scope global ens3
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:fe88:e70d/64 scope link
       valid_lft forever preferred_lft forever

查看节点状态，113 节点现在是 notready 的，因为被我关机了，也是可以正常获取节点信息的

NAME             STATUS     ROLES           AGE     VERSION
192.168.22.111   Ready      control-plane   115m    v1.28.2
192.168.22.112   Ready      control-plane   110m    v1.28.2
192.168.22.113   NotReady   control-plane   108m    v1.28.2
192.168.22.114   Ready      <none>          3m49s   v1.28.2
192.168.22.115   Ready      <none>          3m38s   v1.28.2

ABC 三类地址总结

类别	地址范围	默认子网掩码	网络位/主机位	可用 IP 数量	私有地址范围
A 类	`1.0.0.0` 到 `126.255.255.255`	`255.0.0.0`	8 位 / 24 位	16,777,214	`10.0.0.0` 到 `10.255.255.255`
B 类	`128.0.0.0` 到 `191.255.255.255`	`255.255.0.0`	16 位 / 16 位	65,534	`172.16.0.0` 到 `172.31.255.255`
C 类	`192.0.0.0` 到 `223.255.255.255`	`255.255.255.0`	24 位 / 8 位	254	`192.168.0.0` 到 `192.168.255.255`