在centos7.4完全删除mysql5.7 安装5.6

1.查看版本 停库html [root@5haocentos ~]# cat /etc/redhat-release CentOS Linux release 7.4.1708 (Core) systemctl stop mysqld.service 2.卸载+删除mysql  yum remove  mysql mysql-server mysql-libs mysql-server sql

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