How to find out what podcidr is assigned to each node by calico CNI in kubernetes

kubernetes kubernetes-pod project-calico calico cni

You can use etcdctl to know details of subnet block assigned to each node.

ETCDCTL_API=3 etcdctl ls /calico/ipam/v2/host/node1/ipv4/block/

Above example for a node node1 will give something like below as output.

/calico/ipam/v2/host/node1/ipv4/block/192.168.228.192-26

kubernetes kubernetes-pod project-calico calico cni

Looks like calico adds a custom resource called ipamblocks and it contains the podcidr assigned to each cluster node.

The name of the custom resource itself contains the node's podcidr.

kubectl get ipamblocks.crd.projectcalico.org NAME               AGE10-42-123-0-26     89d10-42-187-192-26   89d

Command to fetch the exact podcidr and nodeip:

kubectl get ipamblocks.crd.projectcalico.org -o jsonpath="{range .items[*]}{'podNetwork: '}{.spec.cidr}{'\t NodeIP: '}{.spec.affinity}{'\n'}"

podNetwork: 10.42.123.0/26   NodeIP: host:<node1-ip>podNetwork: 10.42.187.192/26     NodeIP: host:<node2-ip>

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