yum快速安装MySQL

将rpm下载下来或者直接安装
rpm -Uvh mysql80-community-release-el7-3.noarch.rpm

yum localinstall https://repo.mysql.com//mysql80-community-release-el7-3.noarch.rpm
yum -y install yum-utils 
yum-config-manager --disable mysql80-community
yum-config-manager --enable mysql57-community
yum makecache
yum install mysql-community-server

grep 'temporary password' /var/log/mysqld.log

登录
mysql -uroot -p

ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';