Chapter 20. MariaDB (a replacement for MySQL)
The MariaDB database is a multi-user, multi-threaded SQL database server that consists of the MariaDB server daemon (
mysqld) and many client programs and libraries.[18]
In Red Hat Enterprise Linux, the mariadb-server package provides MariaDB. Enter the following command to see if the mariadb-server package is installed:
~]$ rpm -q mariadb-server
package mariadb-server is not installed
If it is not installed, use the
yum utility as root to install it:
~]# yum install mariadb-server20.1. MariaDB and SELinux
When MariaDB is enabled, it runs confined by default. Confined processes run in their own domains, and are separated from other confined processes. If a confined process is compromised by an attacker, depending on SELinux policy configuration, an attacker's access to resources and the possible damage they can do is limited. The following example demonstrates the MariaDB processes running in their own domain. This example assumes the mariadb-server package is installed:
- Run the
getenforcecommand to confirm SELinux is running in enforcing mode:~]$
getenforceEnforcingThe command returnsEnforcingwhen SELinux is running in enforcing mode. - Enter the following command as the root user to start
mariadb:~]#
systemctl start mariadb.serviceConfirm that the service is running. The output should include the information below (only the time stamp will differ):~]#
systemctl status mariadb.servicemariadb.service - MariaDB database server Loaded: loaded (/usr/lib/systemd/system/mariadb.service; disabled) Active: active (running) since Mon 2013-08-05 11:20:11 CEST; 3h 28min ago - Enter the following command to view the
mysqldprocesses:~]$
ps -eZ | grep mysqldsystem_u:system_r:mysqld_safe_t:s0 12831 ? 00:00:00 mysqld_safe system_u:system_r:mysqld_t:s0 13014 ? 00:00:00 mysqldThe SELinux context associated with themysqldprocesses issystem_u:system_r:mysqld_t:s0. The second last part of the context,mysqld_t, is the type. A type defines a domain for processes and a type for files. In this case, themysqldprocesses are running in themysqld_tdomain.
