Comment 2 for bug 1697531

From our deployed node:

[root@container1 ~]# systemctl status mysql
● mariadb.service - MariaDB database server
   Loaded: loaded (/usr/lib/systemd/system/mariadb.service; enabled; vendor preset: disabled)
  Drop-In: /etc/systemd/system/mariadb.service.d
           └─limits.conf, migrated-from-my.cnf-settings.conf, timeout.conf
   Active: failed (Result: exit-code) since Tue 2017-06-13 14:52:42 UTC; 1min 3s ago
  Process: 9435 ExecStartPre=/bin/sh -c systemctl unset-environment _WSREP_START_POSITION (code=exited, status=226/NAMESPACE)

Jun 13 14:52:42 container1 systemd[1]: Starting MariaDB database server...
Jun 13 14:52:42 container1 systemd[9435]: Failed at step NAMESPACE spawning /bin/sh: Invalid argument
Jun 13 14:52:42 container1 systemd[1]: mariadb.service: control process exited, code=exited status=226
Jun 13 14:52:42 container1 systemd[1]: Failed to start MariaDB database server.
Jun 13 14:52:42 container1 systemd[1]: Unit mariadb.service entered failed state.
Jun 13 14:52:42 container1 systemd[1]: mariadb.service failed.

-- Subject: Unit mariadb.service has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit mariadb.service has begun starting up.
Jun 13 14:52:42 container1 systemd[9435]: Failed at step NAMESPACE spawning /bin/sh: Invalid argument
-- Subject: Process /bin/sh could not be executed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- The process /bin/sh could not be executed and failed.
--
-- The error number returned by this process is 22.
Jun 13 14:52:42 container1 systemd[1]: mariadb.service: control process exited, code=exited status=226
Jun 13 14:52:42 container1 systemd[1]: Failed to start MariaDB database server.
-- Subject: Unit mariadb.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit mariadb.service has failed.
--
-- The result is failed.