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1、实验环境
本实验共两台节点，xianchaomaster1是master，xianchaonode1是worker
kubernetes版本是v1.23.1
系统版本是 centos7.6
具体如下：
[root@xianchaomaster1 ~]# kubectl get nodes -owide
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
xianchaomaster1 Ready control-plane,master 52d v1.23.1 192.168.40.180 <none> CentOS Linux 7 (Core) 3.10.0-1160.11.1.el7.x86_64 docker://20.10.16
xianchaonode1 Ready <none> 52d v1.23.1 192.168.40.181 <none> CentOS Linux 7 (Core) 3.10.0-1160.11.1.el7.x86_64 docker://20.10.16
[root@xianchaomaster1 ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
wordpress-54fc87d546-gqvc2 1/1 Running 0 18d
wordpress-mysql-f59cd675f-xkwsp 1/1 Running 0 18d
2、迁移master
（1）对k8s控制节点xianchaomaster1进行drain
[root@xianchaomaster1 ~]# kubectl drain xianchaomaster1–delete-emptydir-data –force –ignore-daemonsets
备注：
drain：驱逐节点
首先，驱逐node上的pod，其他节点重新创建，接着，将节点调为** SchedulingDisabled**
drain的参数
–force
当一些pod不是经ReplicationController, ReplicaSet, Job, DaemonSet 或者StatefulSet 管理的时候，就需要用–force来强制执行 (例如:kube-proxy)
–ignore-daemonsets
驱逐daemonset管理的pod
–delete-emptydir-data
如果有mount local volumn的pod，会强制驱逐pod
（2）关闭并卸载Docker
[root@xianchaomaster1 ~]# systemctl disable docker –now
[root@xianchaomaster1 ~]# yum remove docker-ce docker-ce-cli -y
（3）安装并配置containerd
[root@xianchaomaster1 ~]# yum install containerd.io cri-tools -y
[root@xianchaomaster1 ~]# crictl config runtime-endpoint unix:///var/run/containerd/containerd.sock
生成配置文件
[root@xianchaomaster1 ~]# containerd config default > /etc/containerd/config.toml
使用vim编辑器打开/etc/containerd/config.toml
第一步：搜素mirrors，把
改成：
[plugins."io.containerd.grpc.v1.cri".registry.mirrors]
[plugins."io.containerd.grpc.v1.cri".registry.mirrors."docker.io"]
endpoint = ["https://rsbud4vc.mirror.aliyuncs.com"]
第二步：搜索sandbox，把
改成：sandbox_image = "registry.aliyuncs.com/google_containers/pause:3.7"
第三步：搜索SystemdCgroup，把
改成：
[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
SystemdCgroup = true
保存退出
（4）重启containerd服务
[root@xianchaomaster1 ~]# systemctl enable containerd ; systemctl restart containerd
3、配置并启动kubelet
设置kubelet启动参数
[root@xianchaomaster1 ~]# vim /etc/sysconfig/kubelet
KUBELET_EXTRA_ARGS="–container-runtime=remote –runtime-request-timeout=15m –container-runtime-endpoint=unix:///run/containerd/containerd.sock"
重启kubelet服务
[root@xianchaomaster1 ~]# systemctl restart kubelet
4、对master节点进行uncordon
[root@xianchaomaster1 ~]# kubectl uncordon xianchaomaster1
5、验证是否把容器运行时由docker迁移到containerd
[root@xianchaomaster1 ~]# kubectl get nodes -owide
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
xianchaomaster1 Ready control-plane,master 52d v1.23.1 192.168.40.180 <none> CentOS Linux 7 (Core) 3.10.0-1160.11.1.el7.x86_64 containerd://1.6.6
xianchaonode1 Ready <none> 52d v1.23.1 192.168.40.181 <none> CentOS Linux 7 (Core) 3.10.0-1160.11.1.el7.x86_64 docker://20.10.16
4、迁移work节点
（1）对k8s工作节点xianchaonode1进行drain
[root@xianchaomaster1 ~]# kubectl drain xianchaonode1 –delete-emptydir-data –force –ignore-daemonsets
（2）关闭并卸载Docker
[root@xianchaonode1 ~]# systemctl disable docker –now
[root@ xianchaonode1 ~]# yum remove docker-ce docker-ce-cli -y
（3）安装并配置containerd
[root@ xianchaonode1 ~]# yum install containerd.io cri-tools -y
[root@ xianchaonode1 ~]# crictl config runtime-endpoint unix:///var/run/containerd/containerd.sock
生成配置文件
[root@ xianchaonode1 ~]# containerd config default > /etc/containerd/config.toml
使用vim编辑器打开/etc/containerd/config.toml
第一步：搜素mirrors，把
改成：
[plugins."io.containerd.grpc.v1.cri".registry.mirrors]
[plugins."io.containerd.grpc.v1.cri".registry.mirrors."docker.io"]
endpoint = ["https://rsbud4vc.mirror.aliyuncs.com"]
第二步：搜索sandbox，把
改成：sandbox_image = "registry.aliyuncs.com/google_containers/pause:3.7"
第三步：搜索SystemdCgroup，把
改成：
[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
SystemdCgroup = true
保存退出
（4）重启containerd服务
[root@ xianchaonode1 ~]# systemctl enable containerd ; systemctl restart containerd
3、配置并启动kubelet
设置kubelet启动参数
[root@ xianchaonode1 ~]# vim /etc/sysconfig/kubelet
KUBELET_EXTRA_ARGS="–container-runtime=remote –runtime-request-timeout=15m –container-runtime-endpoint=unix:///run/containerd/containerd.sock"
重启kubelet服务
[root@ xianchaonode1 ~]# systemctl restart kubelet
4、对master节点进行uncordon
[root@ xianchaonode1 ~]# kubectl uncordon xianchaonode1
5、验证是否把容器运行时由docker迁移到containerd
[root@xianchaomaster1 ~]# kubectl get nodes -owide
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
xianchaomaster1 Ready control-plane,master 52d v1.23.1 192.168.40.180 <none> CentOS Linux 7 (Core) 3.10.0-1160.11.1.el7.x86_64 containerd://1.6.6
xianchaonode1 Ready <none> 52d v1.23.1 192.168.40.181 <none> CentOS Linux 7 (Core) 3.10.0-1160.11.1.el7.x86_64 containerd://1.6.6
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原文链接：https://blog.csdn.net/weixin_38320674/article/details/125814693?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522168994567316800225523234%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fblog.%2522%257D&request_id=168994567316800225523234&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~blog~first_rank_ecpm_v1~times_rank-8-125814693-null-null.268%5Ev1%5Ekoosearch&utm_term=docker%E3%80%81wordpress%E3%80%81wordpress%E5%BB%BA%E7%AB%99%E3%80%81wordpress%E4%B8%BB%E9%A2%98%E3%80%81%E5%AE%B9%E5%99%A8%E9%95%9C%E5%83%8F%E3%80%81
