报错处理四：
### --- 报错现象：kubelet无法启动排查
[root@k8s-master01 ~]# systemctl status kubelet
● kubelet.service - Kubernetes Kubelet
Loaded: loaded (/usr/lib/systemd/system/kubelet.service; enabled; vendor preset: disabled)
Drop-In: /etc/systemd/system/kubelet.service.d
└─10-kubelet.conf
Active: inactive (dead) since Thu 2021-07-15 19:25:09 CST; 1s ago
Docs: https://github.com/kubernetes/kubernetes
Process: 1518 ExecStart=/usr/local/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_SYSTEM_ARGS $KUBELET_EXTRA_ARGS (code=exited, status=0/SUCCESS)
Main PID: 1518 (code=exited, status=0/SUCCESS)
### --- 报错分析：
~~~ ——>先停止当前窗口的kubelet： systemctl stop kubelet
~~~ ——>新开一个窗口，输入tail -f /var/log/messages，敲20次回车，保持窗口清洁
~~~ ——>第一个窗口执行systemctl start kubelet ， 然后立即在另一个窗口执行ctrl + c终止tail
~~~ ——>此时第二个窗口会报大量无法启动的日志，如下：
~~~ ——>Jan 19 21:53:42 k8s-node01 kubelet: F0119 21:53:42.995488 405 server.go:269] failed to run Kubelet: misconfiguration: kubelet cgroup driver: "cgroupfs" is different from docker cgroup driver: "systemd"
~~~ ——>可以看到F开头或者E开头的为错误日志，后面为错误日志。
~~~ 此处报错为kubelet和docker的cgroup类型不一样（你的报错可能不一样，需要自行查看错误信息），需要修改为一样的。
### --- 解决方案：
~~~ # 确认docker是否为systemd
~~~ 注：如果不是systemd，或者没有该文件，请创建该文件。
[root@k8s-node01 ~]# cat /etc/docker/daemon.json
{
"exec-opts": ["native.cgroupdriver=systemd"]
}
[root@k8s-node01 ~]# rm -rf /var/lib/docker
[root@k8s-node01 ~]# systemctl daemon-reload
[root@k8s-node01 ~]# systemctl restart docker
~~~ # 通过docker info确认
[root@k8s-node01 ~]# docker info | grep Driver
Storage Driver: overlay2
Logging Driver: json-file
Cgroup Driver: systemd
~~~ # 修复kubelet
~~~ 将/etc/kubernetes/kubelet-conf.yml文件的cgroupDriver改成systemd
~~~ （要与docker的一致，无法docker的无法更改为systemd，请改为和docker的一样的）。
~~~ 然后执行（无论kubelet-conf.yml是不是systemd都要执行）
[root@k8s-node01 ~]# systemctl stop kubelet
[root@k8s-node01 ~]# systemctl daemon-reload
[root@k8s-node01 ~]# rm -rf /var/lib/kubelet/*
[root@k8s-node01 ~]# systemctl restart kubelet
~~~ # 再次查看即可恢复
[root@k8s-master01 ~]# systemctl status kubelet
● kubelet.service - Kubernetes Kubelet
Loaded: loaded (/usr/lib/systemd/system/kubelet.service; enabled; vendor preset: disabled)
Drop-In: /etc/systemd/system/kubelet.service.d
└─10-kubelet.conf
Active: active (running) since Thu 2021-07-15 19:25:25 CST; 5min ago
Docs: https://github.com/kubernetes/kubernetes
Main PID: 62868 (kubelet)
Tasks: 18
Memory: 72.3M
CGroup: /system.slice/kubelet.service
└─62868 /usr/local/bin/kubelet --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig --kubeconfig=/etc/kubernetes/kubelet.kubeconfig --config=/etc/kubernetes/kubele...
Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart
——W.S.Landor
