root@db:~# journalctl -xe
May 21 00:28:19 db systemd[1]: Starting MySQL Community Server...
-- Subject: Unit mysql.service has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit mysql.service has begun starting up.
May 21 00:28:19 db systemd[1]: mysql.service: Main process exited, code=exited, status=1/FAILURE
May 21 00:28:49 db systemd[1]: Failed to start MySQL Community Server.
-- Subject: Unit mysql.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit mysql.service has failed.
-- 
-- The result is failed.
May 21 00:28:49 db systemd[1]: mysql.service: Unit entered failed state.
May 21 00:28:49 db systemd[1]: mysql.service: Failed with result 'exit-code'.
May 21 00:28:49 db systemd[1]: mysql.service: Service hold-off time over, scheduling restart.
May 21 00:28:49 db systemd[1]: Stopped MySQL Community Server.
-- Subject: Unit mysql.service has finished shutting down
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit mysql.service has finished shutting down.
May 21 00:28:49 db systemd[1]: Failed to reset devices.list on /system.slice/mysql.service: Operation not permitted
May 21 00:28:49 db systemd[1]: Starting MySQL Community Server...
-- Subject: Unit mysql.service has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit mysql.service has begun starting up.
May 21 00:28:49 db systemd[1]: mysql.service: Main process exited, code=exited, status=1/FAILURE
May 21 00:29:19 db systemd[1]: Failed to start MySQL Community Server.
-- Subject: Unit mysql.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit mysql.service has failed.
-- 
-- The result is failed.
May 21 00:29:19 db systemd[1]: mysql.service: Unit entered failed state.
May 21 00:29:19 db systemd[1]: mysql.service: Failed with result 'exit-code'.
May 21 00:29:20 db systemd[1]: mysql.service: Service hold-off time over, scheduling restart.
May 21 00:29:20 db systemd[1]: Stopped MySQL Community Server.
-- Subject: Unit mysql.service has finished shutting down
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit mysql.service has finished shutting down.
May 21 00:29:20 db systemd[1]: Failed to reset devices.list on /system.slice/mysql.service: Operation not permitted
May 21 00:29:20 db systemd[1]: Starting MySQL Community Server...
-- Subject: Unit mysql.service has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit mysql.service has begun starting up.
May 21 00:29:20 db systemd[1]: mysql.service: Main process exited, code=exited, status=1/FAILURE