centos7安装mysql5.7

查看当前系统中的mysql
rpm -qa |grep -i mysql

存在，则删除原来的
rpm -qa |grep -i mysql | xargs yum remove

查看相关文件
find / -name mysql
有则删之
find / -name mysql | xargs rm -r

开始安装，静待完工

wget http://repo.mysql.com/mysql57-community-release-el7-10.noarch.rpm

rpm -Uvh mysql57-community-release-el7-10.noarch.rpm

yum install  -y  mysql-community-server

启动mysql
systemctl start mysqld

报错

Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details.

查看原因
systemctl status mysqld.service

查看mysql文件夹，删
ls /var/lib/mysql
ls /var/lib/mysql | xargs rm -r
重新启动，ok