防止重裝
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yum方式
查看yum是否安裝過mysql
yum list installed mysql*
如或顯示了列表，說明系統中有MySQL 
yum卸載
根據列表上的名字
yum remove mysql-community-client mysql-community-common mysql-community-libs mysql-community-libs-compat mysql-community-server mysql57-community-release
rm -rf /var/lib/mysql rm /etc/my.cnf
rpm查看安裝
rpm -qa | grep -i mysql
rpm 卸載
rpm -e mysql57-community-release-el7-9.noarch
rpm -e mysql-community-server-5.7.17-1.el7.x86_64 rpm -e mysql-community-libs-5.7.17-1.el7.x86_64 rpm -e mysql-community-libs-compat-5.7.17-1.el7.x86_64 rpm -e mysql-community-common-5.7.17-1.el7.x86_64 rpm -e mysql-community-client-5.7.17-1.el7.x86_64 cd /var/lib/ rm -rf mysql/
清除余項
whereis mysql
mysql: /usr/bin/mysql /usr/lib64/mysql /usr/local/mysql /usr/share/mysql /usr/share/man/man1/mysql.1.gz #刪除上面的文件夾 rm -rf /usr/bin/mysql
…
…
我就省略了
刪除配置
rm –rf /usr/my.cnf
rm -rf /root/.mysql_sercret
剩余配置檢查
chkconfig --list | grep -i mysql
chkconfig --del mysqld
根據上面的列表，刪除 ,如：mysqld