k8s集群重启后kubelet启动报错解决

k8s集群重启后kubelet启动报错解决

1 k8s版本 1.23.0，docker-ce版本20.10.14

2 问题报错，启动kubelet报错，内容如下

May 16 09:47:13 k8s-master kubelet: E0516 09:47:13.512956    7403 server.go:302] "Failed to run kubelet" err="failed to run Kubelet: misconfiguration: kubelet cgroup driver: \"systemd\" is different from docker cgroup driver: \"cgroupfs\""
May 16 09:47:13 k8s-master systemd: kubelet.service: main process exited, code=exited, status=1/FAILURE
May 16 09:47:13 k8s-master systemd: Unit kubelet.service entered failed state.
May 16 09:47:13 k8s-master systemd: kubelet.service failed

3 问题分析，根据报错，原因应该是kubelet的cgroupfs与docker不一致导致的

4 问题解决，修改docker配置

cat > /etc/docker/daemon.json <<EOF
{"exec-opts": ["native.cgroupdriver=systemd"]}
EOF

5 再重启docker，问题解决

[root@k8s-master ~]# systemctl restart docker
[root@k8s-master ~]# systemctl restart kubelet
[root@k8s-master ~]# 
[root@k8s-master ~]# systemctl status  kubelet
● kubelet.service - kubelet: The Kubernetes Node Agent
   Loaded: loaded (/usr/lib/systemd/system/kubelet.service; enabled; vendor preset: disabled)
  Drop-In: /usr/lib/systemd/system/kubelet.service.d
           └─10-kubeadm.conf
   Active: active (running) since Mon 2022-05-16 09:48:06 CST; 3s ago
     Docs: https://kubernetes.io/docs/
 Main PID: 8226 (kubelet)
    Tasks: 23
   Memory: 56.9M
   CGroup: /system.slice/kubelet.service
           ├─8226 /usr/bin/kubelet --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf --config...
           └─8745 /opt/cni/bin/calico