K8S中POD节点状态ContainerCreating原因排查

现象：

# kubectl get pods -n kube-system |grep dashboard

kubernetes-dashboard-6685cb584f-dqkwk   0/1     ContainerCreating   0          13m

状态一直是ContainerCreating。

查看pod日志：

# kubectl describe pod kubernetes-dashboard-6685cb584f-dqkwk --namespace=kube-system

...

 Warning  FailedCreatePodSandBox  13m                     kubelet, k8s-220   Failed create pod sandbox: rpc error: code = Unknown desc = failed to set up sandbox container "fe44dea0870b79dbf2ae7d6de0eff1583c8ba99566775e70bfc44ca2088a74ce" network for pod "kubernetes-dashboard-6685cb584f-dqkwk": NetworkPlugin cni failed to set up pod "kubernetes-dashboard-6685cb584f-dqkwk_kube-system" network: failed to set bridge addr: "cni0" already has an IP address different from 10.244.2.1/24

...

可以看到是网络问题。

原因是node之前反复添加过,添加之前需要清除下网络
node上执行：

# kubeadm reset

# systemctl stop kubelet

# systemctl stop docker

# rm -rf /var/lib/cni/ /var/lib/kubelet/* /etc/cni/

# ifconfig cni0 down

# ifconfig flannel.1 down

# ifconfig docker0 down

# ip link delete cni0

# ip link delete flannel.1

# systemctl start docker

# # kubeadm join xxx

重新加入后问题即可解决。

# kubectl get pods -n kube-system |grep dashboard

kubernetes-dashboard-6685cb584f-dqkwk   1/1     Running   0          14m

可以看到状态变为了Running。

巴特西

K8S中POD节点状态ContainerCreating原因排查

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