Kubernetes failed to setup network for pod after executed kubeadm reset
I figured it out, if you change --pod-network-cidr when you reinitialize kubernetes via kubeadm init, you should delete some auto-created things, just follow the steps below before you execute kubeadm init again:
execute kubeadm reset on master and nodes.
execute etcdctl rm --recursive registry reset data in etcd.
rm -rf /var/lib/cni on master and nodes
rm -rf /run/flannel on master and nodes
rm -rf /etc/cni on master and nodes
ifconfig cni0 down on master and nodes
brctl delbr cni0 on master and nodes
Now, my Kubernetes works fine :)
This document helped a lot:
https://github.com/feiskyer/kubernetes-handbook/blob/master/en/troubleshooting/pod.md
specially the part which applies to this issue:
$ ip link set cni0 down$ brctl delbr cni0 If you do this on the api servers and then just reboot the machine it should stabilize pretty quickly.
What helped for me:
ip link set cni0 down
brctl delbr cni0
Delete and re-apply flannel
So no need to build up your cluster again