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You may need to add the new data directory to the list of directories in /etc/apparmor.d/usr.sbin.mysqld as per this blog post: <a href="http://www.lucasward.net/2011/05/moving-mysql-data-directory-beware-of.html" rel="nofollow">http://www.lucasward.net/2011/05/moving-mysql-data-directory-beware-of.html</a> like so: <pre><code>/new-mysql-datadir/ r, /new-mysql-datadir/** rwk, </code></pre> You can confirm that this is your problem by looking in /var/log/messages and seeing if you have error messages similar to this: <pre><code>Aug 6 14:47:23 tinybeast kernel: [20254.145552] type=1400 audit(1344228443.102:54): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/mysqld" pid=24202 comm="apparmor_parser" Aug 6 14:47:23 tinybeast kernel: [20254.165438] type=1400 audit(1344228443.122:55): apparmor="DENIED" operation="mknod" parent=1 profile="/usr/sbin/mysqld" name="/media/data/mysqldata/tinybeast.lower-test" pid=24206 comm="mysqld" requested_mask="c" denied_mask="c" fsuid=0 ouid=0 Aug 6 14:47:23 tinybeast kernel: [20254.165718] type=1400 audit(1344228443.122:56): apparmor="DENIED" operation="mknod" parent=1 profile="/usr/sbin/mysqld" name="/media/data/mysqldata/tinybeast.lower-test" pid=24206 comm="mysqld" requested_mask="c" denied_mask="c" fsuid=0 ouid=0 Aug 6 14:47:23 tinybeast kernel: [20254.167606] type=1400 audit(1344228443.126:57): apparmor="DENIED" operation="open" parent=1 profile="/usr/sbin/mysqld" name="/media/data/mysqldata/mysql/plugin.frm" pid=24206 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=0 ouid=0 Aug 6 14:47:23 tinybeast kernel: [20254.186759] type=1400 audit(1344228443.146:58): apparmor="DENIED" operation="open" parent=1 profile="/usr/sbin/mysqld" name="/media/data/mysqldata/ibdata1" pid=24206 comm="mysqld" requested_mask="rw" denied_mask="rw" fsuid=0 ouid=0 </code></pre> To acknowledge my sources I learned all this from the aforementioned blog post, I'm just posting the particular parts here in case the link to the post ever goes stale.
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