1、查看日志

 journalctl -xeu kubelet | grep Failed

日志内容

12月 28 17:27:02 k8s-node1 kubelet[3442]: E1228 17:27:02.760579 3442 server.go:302] “Failed to run kubelet” err="failed to run Kubelet: running with swap on is not supported, please disable swap! or set --fail-swap-on flag to false. /proc/swaps contained: [Filename\t\t\t\tType\t\tSize\tUsed\tPriority /dev/dm-1

根据报错信息发现，不支持使用swap运行，需要禁用swap，于是修改/etc/sysconfig/kubelet

2、修改/etc/sysconfig/kubelet

 vi /etc/sysconfig/kubelet

添加如下配置项

KUBELET_EXTRA_ARGS="--fail-swap-on=false"

3、重置kubeadm

 kubeadm reset

4、重新执行即可