Installing the ML2 plugin

RHEL-based distributions, such as CentOS, require the installation of the openstack-neutron-ml2 package on all nodes as follows:

# yum install openstack-neutron-ml2

Creating a database for ML2

The ML2 plugin attempts to use a common database and schema that can be shared amongst multiple layer 2 agents. On the controller node, create a new database specifically for use with the ML2 plugin using the MySQL client:

# mysql -u root -p

Use the password set earlier in the OpenStack installation. In this guide, the password was set to openstack.

At the mysql> prompt, execute the following commands to create a database named neutron_ml2 and to grant permissions to the existing neutron user:

CREATE DATABASE neutron_ml2;
GRANT ALL PRIVILEGES ON neutron_ml2.* TO 'neutron'@'localhost' 
IDENTIFIED BY 'neutron';
GRANT ALL PRIVILEGES ON neutron_ml2.* TO 'neutron'@'%'; 
QUIT;

Use crudini to overwrite the existing database connection...