1.下载mysql的repo源

  $ wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm(如果没有wget插件下载 yum install wget)

2.安装mysql-community-release-el7-5.noarch.rpm包

  $ sudo rpm -ivh mysql-community-release-el7-5.noarch.rpm

(获取两个mysql的yum repo源：/etc/yum.repos.d/mysql-community.repo，/etc/yum.repos.d/mysql-community-source.repo。)

3安装mysql

   sudo yum install mysql-server

4.重置mysql密码

  $ mysql -u root

5.修改权限

 sudo chown -R root:root /var/lib/mysql

6.重启服务

 service mysqld restart

7.重置登陆密码

 mysql -u root  
 mysql > use mysql;
 mysql > update user set password=password('123456') where user='root';
 mysql > exit;

8开放root用户远程权限

 grant all privileges on *.* to 'root' @'%' identified by '123456';

 flush privileges;

9退出mysql设置防火墙端口

 /sbin/iptables -I INPUT -p tcp --dport 3306 -j ACCEPT

  service iptables save