Document how to change SSH port (and other settings)

[jbtrystram]

I tried to do this :

variant: fcos
version: 1.5.0
systemd:
  units:
    - name: sshd.socket
      dropins:
        - name: custom-port.conf
          contents: |
              [Socket]
              ListenStream=2222

But this has no effect.

[jlebon]

You probably also need to set Port in an /etc/ssh/sshd_config.d/ dropin.

[travier]

You likely need to setup the SELinux config for the new port to let sshd listen on it.