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MDEV-426: systemd PermissionsStartOnly=true by default

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mariadb-service-convert during migration can create a file containing
ExecStartPre=/usr/sbin/sysctl -q -w vm.drop_caches=3 if the users my.cnf
contains [mysqld_safe] flush_caches. This sysctl entry change requires root
access. No existing ExecStartPre requires execution requires execution
as another user.

There is a comment in the mariadb{,@}.service.in that indicates
mysqld_install which would require -u mysql to explicity change user to
mysql from root since PermissionsStartOnly=true.

Otherwise the following error would be generated:
Oct 14 07:38:38 spaceman systemd[1]: Starting MariaDB database server...
-- 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.
Oct 14 07:38:38 spaceman sysctl[10089]: sysctl: permission denied on key 'vm.drop_caches'
Oct 14 07:38:38 spaceman systemd[1]: mariadb.service: control process exited, code=exited status=255
Oct 14 07:38:38 spaceman systemd[1]: Failed to start MariaDB database server.
This commit is contained in:
Daniel Black 2015-10-14 07:46:31 +02:00 committed by Sergey Vojtovich
parent 079cc48e06
commit 3723c70a30
3 changed files with 5 additions and 5 deletions
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2
cmake/systemd.cmake
View File

@ -61,7 +61,7 @@ MACRO(CHECK_SYSTEMD)
${INSTALL_SYSTEMD_UNITDIR}/mariadb@.service
${INSTALL_SYSTEMD_UNITDIR}/mariadb@bootstrap.service.d/wsrep-new-cluster.conf")
IF(DEB)
SET(SYSTEMD_EXECSTARTPRE "PermissionsStartOnly=true\nExecStartPre=/usr/bin/install -m 755 -o mysql -g root -d /var/run/mysqld")
SET(SYSTEMD_EXECSTARTPRE "ExecStartPre=/usr/bin/install -m 755 -o mysql -g root -d /var/run/mysqld")
SET(SYSTEMD_EXECSTARTPOST "ExecStartPost=/etc/mysql/debian-start")
ENDIF()
MESSAGE(STATUS "Systemd features enabled")

4
support-files/mariadb.service.in
View File

@ -43,10 +43,10 @@ User=mysql
Group=mysql
# Execute pre and post scripts as root, otherwise it does it as User=
# PermissionsStartOnly=true
PermissionsStartOnly=true
# Needed to create system tables etc.
# ExecStartPre=/usr/bin/mysql_install_db
# ExecStartPre=/usr/bin/mysql_install_db -u mysql
# Start main service
# MYSQLD_OPTS here is for users to set in /etc/systemd/system/mariadb.service.d/MY_SPECIAL.conf

4
support-files/mariadb@.service.in
View File

@ -50,10 +50,10 @@ User=mysql
Group=mysql
# Execute pre and post scripts as root, otherwise it does it as User=
# PermissionsStartOnly=true
PermissionsStartOnly=true
# Needed to create system tables etc.
# ExecStartPre=/usr/bin/mysql_install_db
# ExecStartPre=/usr/bin/mysql_install_db -u mysql
# Start main service
# MYSQLD_OPTS here is for users to set in /etc/systemd/system/mariadb@.service.d/MY_SPECIAL.conf