You can connect to a pod using kubectl exec command. For example,
kubectl exec -it nginx-776567f984-vxdzw -- bash
This will connect you to one of the pods with bash enabled.
root@nginx-776567f984-vxdzw:/# whoami
root
root@nginx-776567f984-vxdzw:/# hostname
nginx-776567f984-vxdzw
A pod can run multiple containers and you need to specify which container you want to connect to. You can find the container name using kubectl describe pod nginx-776567f984-vxdzw | grep -i container command.
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