Handling of non-standard datadir

[eliasp]

Right now, there's no handling at all for non-default locations of datadir.

• a fresh deployment doesn't create the datadir
• changing an existing deployment doesn't move the existing datadir to its new location (shutdown of mysql service, moving datadir, starting mysql service again)

There might be some difficulties involved in this, as the package management of some distributions adds mechanisms (postinst etc.) to the MySQL package which expects the default path (/var/lib/mysql) and otherwise might break the package installation/always re-create the datadir, etc.

[hgfischer]

Yes, this is annoying. The configuration exists, but it only creates the datadir for some distributions. For Ubuntu or Debian, for example, it doesn't.

[noelmcloughlin]

related issue copied from #81

Non-standard 'datadir' needs AppArmor changes on Ubuntu

When using a non-standard datadir on Ubuntu, changes to AppArmor are required, otherwise MySQL won't start anymore.
See also: https://blogs.oracle.com/jsmyth/entry/apparmor_and_mysql Similar changes are most likely required for SELinux enabled systems.