1、查看是否已经安装过mysql或其依赖，若已装过要先将其删除，否则第4步使用yum安装时会报错：
方法一：yum list installed | grep mysql
方法二：rpm -qa |grep mysql
2、下载载mysql57-community-release-el6-5.noarch.rpm
wget https://repo.mysql.com//mysql57-community-release-el5-8.noarch.rpm --no-check-certificate
（下载站点：https://dev.mysql.com/downloads/repo/yum/）
3、安装rpm文件
yum install -y mysql57-community-release-el5-8.noarch.rpm
安装完成后，可以在/etc/yum.repos.d中看到增加的文件
4、查看mysql5.7是否启用
yum repolist enabled | grep mysql
5、安装mysql
yum install mysql-community-server
6、启动mysql服务，初始化
service mysqld start
7、查看密码登录并修改密码
grep "password" /var/log/mysqld.log
update mysql.user set authentication_string=password('wclwcw1101!') where user='root' and Host = 'localhost';