root@ThinkCentre:~# service mysql start
Job for mysql.service failed because the control process exited with error code. See "systemctl status mysql.service" and "journalctl -xe" for details.
root@ThinkCentre:~# 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 Wed 2017-09-06 10:35:59 BST; 7s ago
Process: 7912 ExecStart=/usr/sbin/mysqld (code=exited, status=1/FAILURE)
Process: 7903 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS)
Main PID: 7912 (code=exited, status=1/FAILURE); : 7913 (mysql-systemd-s)
Tasks: 2
Memory: 356.0K
CPU: 285ms
CGroup: /system.slice/mysql.service
└─control
├─7913 /bin/bash /usr/share/mysql/mysql-systemd-start post
└─7957 sleep 1
Sep 06 10:35:59 ThinkCentre systemd[1]: Starting MySQL Community Server...
Sep 06 10:36:01 ThinkCentre systemd[1]: mysql.service: Main process exited, code=exited, status=1/FAILURE
root@ThinkCentre:~# journalctl -xe
Sep 06 10:34:59 ThinkCentre systemd[1]: mysql.service: Main process exited, code=exited, status=1/FAILURE
Sep 06 10:35:28 ThinkCentre 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.
Sep 06 10:35:28 ThinkCentre systemd[1]: mysql.service: Unit entered failed state.
Sep 06 10:35:28 ThinkCentre systemd[1]: mysql.service: Failed with result 'exit-code'.
Sep 06 10:35:28 ThinkCentre systemd[1]: mysql.service: Service hold-off time over, scheduling restart.
Sep 06 10:35:28 ThinkCentre 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.
Sep 06 10:35:28 ThinkCentre 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.
Sep 06 10:35:28 ThinkCentre kernel: audit: type=1400 audit(1504690528.626:108): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/7764/status" pid=7764 comm="mysqld" requested_mask="r" den
Sep 06 10:35:28 ThinkCentre audit[7764]: AVC apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/7764/status" pid=7764 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=121 ouid=121
Sep 06 10:35:28 ThinkCentre audit[7764]: AVC apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/sys/devices/system/node/" pid=7764 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=121 ouid
Sep 06 10:35:28 ThinkCentre audit[7764]: AVC apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/7764/status" pid=7764 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=121 ouid=121
Sep 06 10:35:28 ThinkCentre kernel: audit: type=1400 audit(1504690528.634:109): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/sys/devices/system/node/" pid=7764 comm="mysqld" requested_mask
Sep 06 10:35:28 ThinkCentre kernel: audit: type=1400 audit(1504690528.634:110): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/7764/status" pid=7764 comm="mysqld" requested_mask="r" den
Sep 06 10:35:30 ThinkCentre systemd[1]: mysql.service: Main process exited, code=exited, status=1/FAILURE
Sep 06 10:35:59 ThinkCentre 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.
Sep 06 10:35:59 ThinkCentre systemd[1]: mysql.service: Unit entered failed state.
Sep 06 10:35:59 ThinkCentre systemd[1]: mysql.service: Failed with result 'exit-code'.
Sep 06 10:35:59 ThinkCentre systemd[1]: mysql.service: Service hold-off time over, scheduling restart.
Sep 06 10:35:59 ThinkCentre 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.
Sep 06 10:35:59 ThinkCentre 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.
Sep 06 10:35:59 ThinkCentre audit[7912]: AVC apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/7912/status" pid=7912 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=121 ouid=121
Sep 06 10:35:59 ThinkCentre audit[7912]: AVC apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/sys/devices/system/node/" pid=7912 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=121 ouid
Sep 06 10:35:59 ThinkCentre audit[7912]: AVC apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/7912/status" pid=7912 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=121 ouid=121
Sep 06 10:35:59 ThinkCentre kernel: audit: type=1400 audit(1504690559.877:111): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/7912/status" pid=7912 comm="mysqld" requested_mask="r" den
Sep 06 10:35:59 ThinkCentre kernel: audit: type=1400 audit(1504690559.877:112): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/sys/devices/system/node/" pid=7912 comm="mysqld" requested_mask
Sep 06 10:35:59 ThinkCentre kernel: audit: type=1400 audit(1504690559.877:113): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/7912/status" pid=7912 comm="mysqld" requested_mask="r" den
Sep 06 10:36:01 ThinkCentre systemd[1]: mysql.service: Main process exited, code=exited, status=1/FAILURE