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How do you configure MySQL to use block storage on Ubuntu 14.04?

Posted on July 13, 2016

Within /etc/mysql/my.conf, you can easily set datadir=/mnt/your_block/mysql, but there are some deeper issues with apparmor. How do I reconfigure apparmor to acknowledge my new datadir?

I’ve followed directions at [this] (http://askubuntu.com/questions/137424/moving-mysql-datadir) StackOverflow post, but upon completion I get ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/mnt/volume-nyc1-01/mysql/mysqld.sock'

I can’t find mysqld.sock.



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I’m having no luck on Ubuntu 14.04. I followed the StackOverflow commands above and when I attempt to restart mysql I get:

2016-08-25 15:54:08 1909 [ERROR] Fatal error: Can’t open and lock privilege tables: Table ‘mysql.user’ doesn’t exist

in the error log.

Is there an official DigitalOcean tutorial for 14.04?

After you’ve undone the stackexchange suggestions, try looking at /etc/apparmor.d/usr.sbin.mysqld and updating the following stanza with the path to your mount:

# Allow data dir access
  /var/lib/mysql/ r,
  /var/lib/mysql/** rwk,

You’ll also need to restart apparmor:

sudo /etc/init.d/apparmor restart

If systemd still squawks about not being able to find /var/lib/mysql when you try to restart mysql you might try creating a symlink between the mount point and the default location as follows (with the appropriate path to your new volume.)

sudo ln -s /volume-nyc1-01/mysql /var/lib/mysql

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