Posted by hank, Sat Apr 12 00:44:00 UTC 2008
I couldn’t get MySQL to start in Ubuntu 8.04 Hardy Heron after I changed my datadir to /nexus/tardis/mysql - it turns out I needed to change the AppArmor configuration like so:
/etc/apparmor.d/usr.sbin.mysqld
/var/lib/mysql/ r,
/var/lib/mysql/** rwk,
/nexus/tardis/mysql/** rwk,
/nexus/tardis/mysql/ r,
This was in response to the following syslog messages:
/var/log/syslog
Apr 12 00:30:59 tardis mysqld[17818]: 080412 0:30:59 [ERROR] /usr/sbin/mysqld: Can't find file: './mysql/host.frm' (errno: 13)
Apr 12 00:30:59 tardis mysqld[17818]: 080412 0:30:59 [ERROR] Fatal error: Can't open and lock privilege tables: Can't find file: './mysql/host.frm' (errno: 13)
Apr 12 00:30:59 tardis kernel: [25185.601980] audit(1207974659.063:36): operation="inode_permission" request_mask="r::" denied_mask="r::" name="/nexus/tardis/mysql/mysql/host.frm" pid=17817 profile="/usr/sbin/mysqld" namespace="default"
Apr 12 00:30:59 tardis kernel: [25185.602018] audit(1207974659.063:37): operation="inode_permission" request_mask="r::" denied_mask="r::" name="/nexus/tardis/mysql/mysql/host.frm" pid=17817 profile="/usr/sbin/mysqld" namespace="default"
Apr 12 00:30:59 tardis mysqld_safe[17823]: ended
Apparently I didn’t see this important message in my.cnf when I was modifying it:
# * IMPORTANT
# If you make changes to these settings and your system uses apparmor, you may
# also need to also adjust /etc/apparmor.d/usr.sbin.mysqld.
Then, I went and checked /etc/mysql/debian.cnf for the debian-sys-maint password and set it like so:
GRANT ALL PRIVILEGES ON *.* TO 'debian-sys-maint'@'localhost' IDENTIFIED BY '<that password>' WITH GRANT OPTION;
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