1.检查是否安装有Mariadb:rpm -qa|grep mariadb
1.1.如果有就卸载掉:rpm -e --nodeps mariadb-libs-5.5.56-2.el7.x86_64
1.2.删除etc下的my.cnf:rm /etc/my.cnf
2.下载mysql安装包(https://downloads.mysql.com/archives/community/):
1.检查是否安装有Mariadb:rpm -qa|grep mariadb
1.1.如果有就卸载掉:rpm -e --nodeps mariadb-libs-5.5.56-2.el7.x86_64
1.2.删除etc下的my.cnf:rm /etc/my.cnf
2.下载mysql安装包(https://downloads.mysql.com/archives/community/):