卸載mariadb
1. 當前安裝列表
rpm -qa | grep mariadb
2.卸載
rpm -e --nodeps mariadb-libs-5.5.56-2.el7.x86_64
3 檢查卸載干凈沒，可以看到已經沒有列表了
安裝mysql
1.下載mysql的repo源
wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm
2.安裝mysql-community-release-el7-5.noarch.rpm包
sudo rpm -ivh mysql-community-release-el7-5.noarch.rpm
3.安裝mysql
sudo yum install mysql-server
按提示步驟來就行
