After increasing the worker count for an existing cluster, and running “terraform apply”, the new worker does not register with the cluster after 10-20 minutes. The “terraform apply” process may have been interrupted before it completed.
The machine may have booted successfully, but was not able to join the cluster. Verify this happened by looking at the exit code for the following service:
journalctl -xu k8s-node-bootstrap
If exit code is nonzero, try to run "terraform apply" again. Make sure your SSH key is loaded in the ssh-agent & "terraform apply" completes successfully without interruption.