Kublet PLEG不健康问题排障

环境：Rancher管控的K8S集群。

现象：某个Node频繁出现“PLEG is not healthy: pleg was last seen active 3m46.752815514s ago; threshold is 3m0s”错误，频率在5-10分钟就会出现一次。

排查：

1. kubectl get pods --all-namespaces 发现有一个 istio-ingressgateway-6bbdd58f8c-nlgnd 一直处于Terminating状态，也就是说杀不死。
2. 到Node上 docker logs --tail 100 kubelet 也看到这个Pod的状态异常：

I0218 01:21:17.383650   10311 kubelet.go:1775] skipping pod synchronization - [PLEG is not healthy: pleg was last seen active 3m46.752815514s ago; threshold is 3m0s]
 ...
 E0218 01:21:30.654433   10311 generic.go:271] PLEG: pod istio-ingressgateway-6bbdd58f8c-nlgnd/istio-system failed reinspection: rpc error: code = DeadlineExceeded desc = context deadline exceeded

kubelet delete pod
kubectl delete pod --force --grace-period=0
docker ps -a| grep ingressgateway-6bbdd58f8c-nlgnd
kubectl delete pod --force --grace-period=0

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