# yum install mysql -y
# mysql
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (111)
试着去启动mysql服务，仍然不行
 
# systemctl start mysql
Failed to issue method call: Unit mysql.service failed to load: No such file or directory.
 
# systemctl start mysql.service
Failed to issue method call: Unit mysql.service failed to load: No such file or directory
 
# systemctl enable mysql.service
Failed to issue method call: Access denied

# yum install mariadb-server -y
systemctl stop mariadb.service
 
# systemctl start mariadb.service
# systemctl enable mariadb.service
# mysql
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 10
Server version: 5.5.44-MariaDB MariaDB Server
 
Copyright (c) 2000, 2015, Oracle, MariaDB Corporation Ab and others.
 
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
 
MariaDB [(none)]>

# mysql_secure_installation