One thing that I'm seeing that may need to be documented, is that this
breaks mysql-testsuite in its default configuration.
Because we can no longer let /usr/sbin/mysqld write to /tmp at will, the
test suite won't start without some coaxing. This works
sudo -u mysql /usr/lib/mysql-test/mysql-test-run.pl
--vardir=/var/tmp/mysql
Or, if we add this to the apparmor profile:
# for the testing suite
owner @{HOME}/tmp/** rwkl,
owner @{HOME}/tmp/ rw,
Then we can start it as any user with just
/usr/lib/mysql-test/mysql-test-run.pl --vardir=$HOME/tmp
The mysql user runs with $HOME == /nonexistent, so this should be safe.
--
MySQL must not use /tmp
https://bugs.launchpad.net/bugs/375371
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