升级K8S到v1.19.4后，执行部署pod后状态一直是 ContainerCreating，查看下详情,可以看到：
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kubectl describe pod nginx-7848d4b86f-tqrg2
Failed to create pod sandbox: rpc error:
code = Unknown desc = failed to set up sandbox container "f4be859a7865c6338c0e07351435bce8c59da26d2a5a1a05cbbf56f48143ed48"
network for pod "nginx-7848d4b86f-tqrg2": networkPlugin cni failed to set up pod "nginx-7848d4b86f-tqrg2_default"
network: open /run/flannel/subnet.env: no such file or directory
可以看下master节点上是有这个文件的：
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cat /run/flannel/subnet.env
FLANNEL_NETWORK=10.244.0.0/16
FLANNEL_SUBNET=10.244.0.1/24
FLANNEL_MTU=1450
FLANNEL_IPMASQ=true
各个worker节点上并没有找到这个文件，只要把这个文件拷贝到各个worker节点，然后删除未启动的pod，稍等片刻就会自动重新创建完成pod了。