SQL database for RHEL and CentOS

Most OpenStack services use an SQL database to store information. The database typically runs on the controller node. The procedures in this guide use MariaDB or MySQL depending on the distribution. OpenStack services also support other SQL databases including PostgreSQL.

Install and configure components

1. Install the packages:

   # yum install mariadb mariadb-server python2-PyMySQL
   

2. Create and edit the /etc/my.cnf.d/openstack.cnf file (backup existing configuration files in /etc/my.cnf.d/ if needed) and complete the following actions:

   • Create a [mysqld] section, and set the bind-address key to the management IP address of the controller node to enable access by other nodes via the management network. Set additional keys to enable useful options and the UTF-8 character set:

     [mysqld]
     bind-address = 10.0.0.11
     
     default-storage-engine = innodb
     innodb_file_per_table = on
     max_connections = 4096
     collation-server = utf8_general_ci
     character-set-server = utf8
     

Finalize installation

1. Start the database service and configure it to start when the system boots:

   # systemctl enable mariadb.service
   # systemctl start mariadb.service
   

2. Secure the database service by running the mysql_secure_installation script. In particular, choose a suitable password for the database root account:

   # mysql_secure_installation