QA:Testcase use MySQL for OpenStack database

Description

Rather than using the default sqlite DB, you can use MySQL.

Setup

First install and enable MySQL:

$> sudo yum install -y mysql-server
$> sudo service mysqld start
$> sudo chkconfig mysqld on

Set a password for the root account and delete the anonymous accounts:

$> mysql -u root
mysql> update mysql.user set password = password('iamroot') where user = 'root';
mysql> delete from mysql.user where user = '';

Create a database and user account specifically for nova:

mysql> create database nova;
mysql> create user 'nova'@'localhost' identified by 'nova';
mysql> create user 'nova'@'%' identified by 'nova';
mysql> grant all on nova.* to 'nova'@'%';

Next, you want to switch to using the MySQL DB. But once you do so, you're essentially starting from scratch with a clean DB. So, make sure all your floating IPs are released, volumes deleted and instances terminated:

$> euca-terminate-instances i-00000001

Then shutdown all the services:

$> for iii in api compute network volume scheduler; do sudo service openstack-nova-$iii stop; done

Now you configure nova to use the DB:

$> echo '--sql_connection=mysql://nova:nova@localhost/nova' | sudo tee -a /etc/nova/nova.conf 

How to test

Create the DB schema:

$> sudo nova-manage db sync

Restart the services:

$> for iii in api compute network volume scheduler; do sudo service openstack-nova-$iii start; done

Now go back over the previous test cases and create a user, project, network and keypair. You don't need to re-register the images. Then launch an instance and testing floating IPs and volumes.

Expected Results

Everything should work as before.

You should see that Nova is using the MySQL DB.

$> mysql -u nova -pnova nova -e 'select * from migrate_version;'
+---------------+------------------------------------------------------------------+---------+
| repository_id | repository_path                                                  | version |
+---------------+------------------------------------------------------------------+---------+
| nova          | /usr/lib/python2.7/site-packages/nova/db/sqlalchemy/migrate_repo |      46 |
+---------------+------------------------------------------------------------------+---------+