root@db:~# systemctl status mysql.service
● mysql.service - MySQL Community Server
   Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
   Active: activating (start-post) (Result: exit-code) since Sat 2016-05-21 00:25:16 EEST; 11s ago
  Process: 3893 ExecStart=/usr/sbin/mysqld (code=exited, status=1/FAILURE)
  Process: 3892 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS)
 Main PID: 3893 (code=exited, status=1/FAILURE);         : 3894 (mysql-systemd-s)
    Tasks: 2 (limit: 512)
   Memory: 3.0M
      CPU: 352ms
   CGroup: /system.slice/mysql.service
           └─control
             ├─3894 /bin/bash /usr/share/mysql/mysql-systemd-start post
             └─3919 sleep 1

May 21 00:25:16 db systemd[1]: mysql.service: Service hold-off time over, scheduling restart.
May 21 00:25:16 db systemd[1]: Stopped MySQL Community Server.
May 21 00:25:16 db systemd[1]: Starting MySQL Community Server...
May 21 00:25:16 db systemd[1]: mysql.service: Main process exited, code=exited, status=1/FAILURE