Fun with SystemD service statuses

type-forking.log

# With the unit file having 'Type=forking'

root@aio1-glance-container-c7e2fe9a:~# systemctl daemon-reload; systemctl restart glance-api; echo $?
Job for glance-api.service failed because the control process exited with error code. See "systemctl status glance-api.service" and "journalctl -xe" for details.
1
Oct 23 15:11:31 aio1-glance-container-c7e2fe9a uwsgi[4559]: /openstack/venvs/glance-19.0.0.0b1/bin/uwsgi: error while loading shared libraries: libxml2.so.2: cannot open shared object file: No such file or directory
Oct 23 15:11:31 aio1-glance-container-c7e2fe9a systemd[1]: glance-api.service: Control process exited, code=exited status=127
Oct 23 15:11:31 aio1-glance-container-c7e2fe9a systemd[1]: Failed to start glance-api service.
-- Subject: Unit glance-api.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit glance-api.service has failed.
--
-- The result is failed.
Oct 23 15:11:31 aio1-glance-container-c7e2fe9a systemd[1]: glance-api.service: Unit entered failed state.
Oct 23 15:11:31 aio1-glance-container-c7e2fe9a systemd[1]: glance-api.service: Failed with result 'exit-code'.

type-simple.log

# With the unit file having 'Type=simple'

root@aio1-glance-container-c7e2fe9a:~# systemctl daemon-reload; systemctl restart glance-api; echo $?
0
root@aio1-glance-container-c7e2fe9a:~# journalctl -xe
Oct 23 15:13:16 aio1-glance-container-c7e2fe9a systemd[1]: Failed to reset devices.list on /glance.slice: Operation not permitted
Oct 23 15:13:16 aio1-glance-container-c7e2fe9a systemd[1]: Started glance-api service.
-- Subject: Unit glance-api.service has finished start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit glance-api.service has finished starting up.
--
-- The start-up result is done.
Oct 23 15:13:16 aio1-glance-container-c7e2fe9a systemd[1]: Failed to reset devices.list on /init.scope: Operation not permitted
Oct 23 15:13:16 aio1-glance-container-c7e2fe9a uwsgi[4643]: /openstack/venvs/glance-19.0.0.0b1/bin/uwsgi: error while loading shared libraries: libxml2.so.2: cannot open shared object file: No such file or directory
Oct 23 15:13:16 aio1-glance-container-c7e2fe9a systemd[1]: Failed to reset devices.list on /user.slice: Operation not permitted
Oct 23 15:13:16 aio1-glance-container-c7e2fe9a systemd[1]: glance-api.service: Main process exited, code=exited, status=127/n/a
Oct 23 15:13:16 aio1-glance-container-c7e2fe9a systemd[1]: glance-api.service: Unit entered failed state.
Oct 23 15:13:16 aio1-glance-container-c7e2fe9a systemd[1]: glance-api.service: Failed with result 'exit-code'.