查看Linux版本

[root@localhost ~]# cat /etc/redhat-release
CentOS Linux release 7.1.1503 (Core)

因为Centos7 里面没有MysqL的yum源，重新下载建立yum源，然后创建MysqL数据库

[root@localhost ~]# wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm

[root@localhost ~]# rpm -ivh MysqL-community-release-el7-5.noarch.rpm

[root@localhost ~]# yum install MysqL-server

登录数据库

[root@localhost opt]# MysqL -u root
ERROR 2002 (HY000): Can’t connect to local MysqL server through socket ‘/var/lib/MysqL/MysqL.sock’ (2)

注意:/var/lib/MysqL的访问权限问题，将该文件夹的所有者改为root用户

[root@localhost opt]# chown -R root:root /var/lib/MysqL

重启MysqLd 服务

[root@localhost opt]# service MysqLd restart

重新登录MysqL库

[root@localhost opt]# MysqL -u root
Welcome to the MysqL monitor. Commands end with ; or \g.
Your MysqL connection id is 2
Server version: 5.6.34 MysqL Community Server (GPL)

Copyright (c) 2000,2016,Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type ‘help;’ or ‘\h’ for help. Type ‘\c’ to clear the current input statement.

MysqL> use MysqL

MysqL> update user set password=password(“123456”) where user=’root’;
Query OK,4 rows affected (0.15 sec)
Rows matched: 4 Changed: 4 Warnings: 0

MysqL> exit
Bye
[root@localhost opt]#

修改防火墙配置