备注：如果删不掉的话可以试试这条命令：yum remove mysql-libs

然后依次安装：

　　#rpm -ivh mysql-community-common-版本.el6.x86_64.rpm

　　#rpm -ivh mysql-community-libs-版本.el6.x86_64.rpm

　　#rpm -ivh mysql-community-client-版本.el6.x86_64.rpm

　　#rpm -ivh mysql-community-server-版本.el6.x86_64.rpm

4.数据库初始化：

为了保证数据库目录为与文件的所有者为 mysql 登陆用户，如果你是以 root 身份运行 mysql 服务，需要执行下面的命令初始化
mysqld --initialize --user=mysql

systemctl start mysqld.service

mysql -uroot -p
第一次不用输入密码直接登录，如果输入密码了或者碰到如下错误：

Access denied for user ‘root‘@‘localhost‘ (using password:YES)

请参考这篇博客解决：

http://blog.csdn.net/skywalker_leo/article/details/47274441；

[root@wshCentOS ~]# mysql -uroot -proot123
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 19538
Server version: 5.7.20 MySQL Community Server (GPL)

Copyright (c) 2000, 2017, 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>
修改之后登录成功，可能需要重置密码；

以上；

centOS7 安装mysql-5.7.20-1.el7.x86_64.rpm-bundle.tar

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