yum卸載

1、查看mysql安裝了哪些東西

rpm -qa |grep -i mysql

2、開始卸載

yum remove mysql-community-common-5.7.20-1.el7.x86_64
yum remove mysql-community-client-5.7.20-1.el7.x86_64
yum remove mysql57-community-release-el7-11.noarch
yum remove mysql-community-libs-5.7.20-1.el7.x86_64
yum removemysql-community-server-5.7.20-1.el7.x86_64
...

3.查看是否卸載完成

rpm -qa |grep -i mysql

4.刪除相關目錄

find / -name mysql
rm -rf

5.刪除/var/log/mysqld.log

如果不刪除這個文件，會導致新安裝的mysql無法生存新密碼，導致無法登陸