Stopping server and client

How to stop server and client agent using terminal command.

This depends on how these processes were started. If you are testing things out in dev mode, ctrl-c will stop them.

If you are running on Linux with systemd, you can use systemctl:
systemctl stop nomad (this works on both clients and servers - we use the same service name in both cases)

is killall nomad ok to use ? It does the job.