最近在用ArchLinux在虚拟机里学习Linux。现在想在ArchLinux中安装WordPress，首先就需要安装MySQL数据库。但是在MySql被Oracle收购之后，很多开源支持者就转而使用MariaDb了。不过MariaDb也和MySql兼容的，所以基本不用有什么担心。由于ArchLinux只带了MariaDb，所以我们就用MariaDb来代替MySql。
安装MariaDb和其客户端工具，
sudo pacman -S mariadb mariadb-clients安装完成之后，会出现如何开启MariaDb的提示：
:: You need to initialize the MariaDB data directory prior to starting
the service. This can be done with mysql_install_db command, e.g.:
mysql_install_db –user=mysql –basedir=/usr –datadir=/var/lib/mysql
根据提示，我们运行如下命令就可以初始化MariaDb的数据目录了。
sudo mysql_install_db --user=mysql --basedir=/usr --datadir=/var/lib/mysql在经过一长串提示信息之后，就会出现相应的如何开启MariaDb的帮助信息：
To start mysqld at boot time you have to copy support-files/mysql.server to the right place for your system PLEASE REMEMBER TO SET A PASSWORD FOR THE MariaDB root USER ! To do so, start the server, then issue the following commands: '/usr/bin/mysqladmin' -u root password 'new-password' '/usr/bin/mysqladmin' -u root -h mypc password 'new-password' Alternatively you can run: '/usr/bin/mysql_secure_installation' which will also give you the option of removing the test databases and anonymous user created by default. This is strongly recommended for production servers. See the MariaDB Knowledgebase at http://mariadb.com/kb or the MySQL manual for more instructions. You can start the MariaDB daemon with: cd '/usr' ; /usr/bin/mysqld_safe --datadir='/var/lib/mysql' You can test the MariaDB daemon with mysql-test-run.pl cd '/usr/mysql-test' ; perl mysql-test-run.pl Please report any problems at http://mariadb.org/jira The latest information about MariaDB is available at http://mariadb.org/. You can find additional information about the MySQL part at: http://dev.mysql.com Support MariaDB development by buying support/new features from MariaDB Corporation Ab. You can contact us about this at sales@mariadb.com. Alternatively consider joining our community based development effort: http://mariadb.com/kb/en/contributing-to-the-mariadb-project/同样根据提示，我们首先需要先启动MariaDb，
sudo systemctl start mysqld然后为root用户设置一个新密码，
mysqladmin -u root password '12345678'然后尝试登录MariaDb，如果登录成功，说明配置完成了，
mysql -uroot -p 12345678如果想要MariaDb开机自动启动，那么就运行以下命令，