Troubleshooting additional nodes not joining the cluster

Problem:

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.

Solution:

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.