The etcd Endpoint Trap
A cluster migration just took your whole control plane offline. In the next few minutes you'll find out why, and fix it the way the CKA exam expects.
This is a CKA Troubleshooting walkthrough. Every command below is real output from a live cluster, and you can reproduce the whole thing yourself (scripts at the end).
The scenario
A single-node kubeadm cluster was migrated to a new machine. The control plane won't come up. Your task: identify the broken component, find the root cause, fix the config, restart, and verify.
