The systemd KillMode to use for glusterd. glusterd spawns other daemons like gsyncd. If you want these to stop when glusterd is stopped (e.g. to ensure that NixOS config changes are reflected even for these sub-daemons), set this to ‘control-group’. If however you want running volume processes (glusterfsd) and thus gluster mounts not be interrupted when glusterd is restarted (for example, when you want to restart them manually at a later time), set this to ‘process’.

"control-group"