MySQL - MariaDB - CentOS 7 - Can't start server: can't create PID file: Permission denied

Ошибка вида

# journalctl -xe
- Unit mariadb.service has begun starting up.
Feb 03 15:09:11 vps mysqld_safe[3464]: 170203 15:09:11 mysqld_safe Logging to '/var/log/mariadb/mariadb.log'.
Feb 03 15:09:11 vps mysqld_safe[3464]: 170203 15:09:11 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
Feb 03 15:09:13 vps mysqld_safe[3464]: 170203 15:09:13 mysqld_safe mysqld from pid file /var/run/mariadb/mariadb.pid ended
Feb 03 15:09:13 vps systemd[1]: mariadb.service: control process exited, code=exited status=1
Feb 03 15:09:13 vps systemd[1]: Failed to start MariaDB database server.
-- Subject: Unit mariadb.service has failed
-- Defined-By: systemd

Смотрим делатальнее логи MariaDB

# tail -100 /var/log/mariadb/mariadb.log
170203 15:09:12  InnoDB: Waiting for the background threads to start
170203 15:09:13 Percona XtraDB (http://www.percona.com) 5.5.49-MariaDB-38.0 started; log sequence number 1670303
170203 15:09:13 [Note] Plugin 'FEEDBACK' is disabled.
170203 15:09:13 [Note] Server socket created on IP: '0.0.0.0'.
170203 15:09:13 [ERROR] mysqld: Can't create/write to file '/var/run/mariadb/mariadb.pid' (Errcode: 13)
170203 15:09:13 [ERROR] Can't start server: can't create PID file: Permission denied
170203 15:09:13 mysqld_safe mysqld from pid file /var/run/mariadb/mariadb.pid ended

Решение - подправить владельца на директорию:

#chown -R mysql:mysql /var/run/mariadb/
# systemctl restart mariadb.service