Linux X11 Forwarding Recipe

1. Client:
   1. macOS:
      1. (First time) Install XQuartz:

         brew install --cask xquartz

      2. Start XQuartz:

         open -a XQuartz.app

2. Server:
   1. Ubuntu:
      1. ssh normally into the server:

         ssh root@host

      2. Make sure X11 apps are installed:

         apt-get update && DEBIAN_FRONTEND=noninteractive TZ=${TZ:-UTC} apt-get -y install x11-apps

      3. Update the sshd config to allow remote X11:

         sed -i 's/.*X11Forwarding no/X11Forwarding yes/g' /etc/ssh/sshd_config && sed -i 's/.*X11UseLocalhost yes/X11UseLocalhost no/g' /etc/ssh/sshd_config

      4. Update the sshd runtime configuration:

         kill -HUP $(cat /var/run/sshd.pid)

      5. exit the ssh session
      6. ssh again with X11 forwarding:

         ssh -Y root@host

      7. Test some X11 app

         xclock

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