1. 卸载原有mysql

rpm -qa | grep mysql
rpm -e --nodeps mysql*

2. 下载mysql的repo源

wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm

如果报错：-bash: wget: 未找到命令
安装插件：yum -y install wget

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

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

4. 安装MySQL

sudo yum install mysql-server

5. 重置MySQL密码

先授权/var/lib/mysql访问权限

chown root /var/lib/mysql/
mysql -u root
use mysql;
update user set password=password('你的密码') where user='root';
exit;
service mysqld restart  # 重启mysql服务

6. 配置远程访问

mysql -u root -p
: 输入上面设置的密码
GRANT ALL PRIVILEGES ON *.* TO root@"%" IDENTIFIED BY "远程访问密码";
service mysqld restart  # 重启mysql服务

7. 关闭防火墙

systemctl stop firewalld.service