I have setup a kubernete cluster with kubeadm in 2 beta metal. the cluster works well. the kubeadm command I used: sudo kubeadm init --pod-network-cidr=10.244.0.0/16
When I do the the performance test, I need to run more pods in the work node. I met a mistake, the PodCIDR in my work node is,PodCIDR: 10.244.1.0/24, so i can run 254 pods at most, although i have change the max-pod to 500.
So my question is how can i change the PodCIDR in my node. I have trid to change to /etc/kubernetes/manifests/kube-controller-manager.yaml set - --node-cidr-mask-size=16, and restart the kubelet, but it makes no effort.
PodCIDR is managed by the CNI, depends on what CNI you're using. You might want to change the CNI config and restart every node.
Here is the reference: https://capstonec.com/help-i-need-to-change-the-pod-cidr-in-my-kubernetes-cluster/