MySQL using space in the Ubuntu root filesysem, how can I change to use

Question

I'm using MySQL on Ubuntu Server 15.10.

I've installed MySQL with sudo apt-get install mysql-server and I'm logging into MySQL as -u root -h localhost

The problem I'm having is that as I add data to my tables, this uses space from the /dev/root filesystem. As this has a limited amount of space, I need the MySQL server to store things in the /dev/md3 filesystem. The /dev/md3 is the filesystem which files in the /home/user folder use. I've included a picture to show what the different filesystems look like, generated by typing the command df .

Image of the filesystems ( df command).

I have a script that adds rows to a table. When I run this script the number of 1k-blocks in the /dev/root filesystem decreases and the /dev/md3 filesystem's available 1k-blocks stay constant.

I need MySQL to use the space found in the /dev/md3 not the /dev/root . This is because the majority of hard drive space is in /dev/md3 . How do I do this?

Things I have tried so far:

• Changing the configuration setting to datadir = /home/user/mysql and restarting MySQL. I gave the directory 777 permissions.
• Changing the configuration setting to innodb_data_home_dir = /home/user/mysql and restarting MySQL. I gave the directory 777 permissions.

Both of these attempts haven't yielded any results. Any help will be greatly appreciated.

Thanks

Answer 1

Make sure you execute the following steps one by one

1.) Stop the mysql server: sudo /etc/init.d/mysql stop

2.) Then copy the existing mysql data files to the new location: sudo cp -R -p /var/lib/mysql /home/user/mysql

3.) Add an apparmor alias: edit nano /etc/apparmor.d/tunables/alias add line with alias /var/lib/mysql/ -> /home/user/mysql

3.1.) Reload apparmor: sudo /etc/init.d/apparmor reload

4.) Edit the datadir variable nano /etc/mysql/my.cnf and change it to the new location: datadir=/home/user/mysql

5.) Restart mysql server: sudo /etc/init.d/mysql restart