解决CentOS7 无法启动mysql 的解决办法

MariaDB数据库管理系统是MySQL的一个分支，主要由开源社区在维护，采用GPL授权许可。开发这个分支的原因之一是：甲骨文公司收购了MySQL后，有将MySQL闭源的潜在风险，因此社区采用分支的方式来避开这个风险。[3]

MariaDB的目的是完全兼容MySQL，包括API和命令行，使之能轻松成为MySQL的代替品。在存储引擎方面，10.0.9版起使用XtraDB（名称代号为Aria）来代替MySQL的InnoDB

# 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

下面讲正确的步骤

# yum install mariadb-server -y
# 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)]>

搞定!

如何设置mysql root密码

# mysql_secure_installation