When checking a service status via
systemctl status docker
the output is something like
● docker.service - Docker Application Container Engine Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled) Active: inactive (dead) (Result: exit-code) since Mon 2018-03-19 13:52:21 CST; 4min 32s ago Docs: https://docs.docker.com Process: 6001 ExecStart=/usr/bin/dockerd -H fd:// (code=exited, status=205/LIMITS) Main PID: 6001 (code=exited, status=205/LIMITS)
The question is about the part in bold: the main process exit code and status information.
Is there a list of all the codes and statuses along with their explanation ?
I know that most times it's self-explanatory (and I know the answer to the question here) but lately we get this question a lot at work (some people search via google but can't find it, other people open the systemd.service man page, search for e.g. code 203 and don't find it...) so I thought I might as well put it here so it's easier for people to find the answer via google.