1.檢查是否安裝有Mariadb:rpm -qa|grep mariadb
1.1.如果有就卸載掉:rpm -e --nodeps mariadb-libs-5.5.56-2.el7.x86_64
1.2.刪除etc下的my.cnf:rm /etc/my.cnf
2.下載mysql安裝包(https://downloads.mysql.com/archives/community/):
1.檢查是否安裝有Mariadb:rpm -qa|grep mariadb
1.1.如果有就卸載掉:rpm -e --nodeps mariadb-libs-5.5.56-2.el7.x86_64
1.2.刪除etc下的my.cnf:rm /etc/my.cnf
2.下載mysql安裝包(https://downloads.mysql.com/archives/community/):