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©Copyright 蕃薯耀 2021-12-30
https://www.cnblogs.com/fanshuyao/
一、查看有没有安装Mysql
1、yum 安装方式查看有没有安装的Mysql
yum list installed mysql*
示例：
[root@host-101 ~]# yum list installed mysql* 已加载插件：fastestmirror, langpacks Loading mirror speeds from cached hostfile * base: mirrors.aliyun.com * extras: mirrors.aliyun.com * updates: mirrors.aliyun.com 已安装的软件包 mysql-community-client.x86_64 5.7.21-1.el7 installed mysql-community-common.x86_64 5.7.21-1.el7 installed mysql-community-libs.x86_64 5.7.21-1.el7 installed mysql-community-server.x86_64 5.7.21-1.el7 installed
删除已经安装的软件包
yum remove mysql-community-client.x86_64 mysql-community-common.x86_64 mysql-community-libs.x86_64 mysql-community-server.x86_64
2、rpm 方式查看有没有安装的Mysql：
rpm -qa | grep -i mysql
示例：
[root@host-101 ~]# rpm -qa | grep -i mysql mysql-community-libs-5.7.21-1.el7.x86_64 mysql-community-client-5.7.21-1.el7.x86_64 mysql-community-server-5.7.21-1.el7.x86_64 mysql-community-common-5.7.21-1.el7.x86_64
要按照顺序删除：
rpm -e mysql-community-server-5.7.21-1.el7.x86_64 rpm -e mysql-community-client-5.7.21-1.el7.x86_64 rpm -e mysql-community-libs-5.7.21-1.el7.x86_64 rpm -e mysql-community-common-5.7.21-1.el7.x86_64
要按照顺序删除，不然会报错：依赖检测失败：
[root@host-101 ~]# rpm -e mysql-community-libs-5.7.21-1.el7.x86_64 错误：依赖检测失败： mysql-community-libs(x86-64) >= 5.7.9 被 (已安裝) mysql-community-client-5.7.21-1.el7.x86_64 需要 [root@host-101 ~]# rpm -e mysql-community-client-5.7.21-1.el7.x86_64 错误：依赖检测失败： mysql-community-client(x86-64) >= 5.7.9 被 (已安裝) mysql-community-server-5.7.21-1.el7.x86_64 需要
删除完之后，再检查一下（有的话，继续删除）：
rpm -qa | grep -i mysql
二、删除残留的mysql目录或文件：
1、查询mysql的安装目录
whereis mysql
示例：
[root@host-101 ~]# whereis mysql mysql: /usr/local/mysql /usr/share/mysql /java/mysql5.7/bin/mysql
删除上面的文件夹
rm -rf /usr/local/mysql rm -rf /usr/share/mysql rm -rf /java/mysql5.7/bin/mysql
2、根据mysql的名称继续查找残留的文件，并删除：
find / -name mysql find / -name mysqld
示例：
mysql:[root@host-101 ~]# find / -name mysql /run/lock/subsys/mysql /etc/selinux/targeted/active/modules/100/mysql /etc/selinux/targeted/tmp/modules/100/mysql /var/lib/mysql /var/lib/mysql/mysql /java/mysql5.7/include/mysql /java/mysql5.7/data/mysql
删除上面的文件
rm -rf /run/lock/subsys/mysql rm -rf /etc/selinux/targeted/active/modules/100/mysql rm -rf /etc/selinux/targeted/tmp/modules/100/mysql rm -rf /var/lib/mysql rm -rf /var/lib/mysql/mysql rm -rf /java/mysql5.7/include/mysql rm -rf /java/mysql5.7/data/mysql rm -rf /java/mysql5.7/bin/mysqld
3、删除mysql 配置文件
rm -rf /etc/my.cnf
4、删除 /var/log/mysqld.log
（如果不删除这个文件，会导致新安装的 mysql 无法生存新密码，导致无法登陆）
rm -rf /var/log/mysqld.log rm -rf /var/log/mysql.log
5、删除mysql开机自启动服务
服务名有可能是mysql或者mysqld，具体删除根据查询出来的结果
chkconfig --list | grep -i mysql chkconfig --del mysqld
6、删除/etc/init.d的文件
rm -rf /etc/init.d/mysqld
示例：
[root@host-101 system]# cd /etc/init.d [root@host-101 init.d]# ll | grep mysql -rwxr-xr-x. 1 root root 10576 12月 29 16:38 mysqld [root@host-101 init.d]# rm -rf mysqld
7、删除/usr/lib/systemd/system的服务
cd /usr/lib/systemd/system #查询 ll | grep mysql #删除 rm -rf mysqld.service rm -rf mysqld@.service
（时间宝贵，分享不易，捐赠回馈，^_^）
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©Copyright 蕃薯耀 2021-12-30
https://www.cnblogs.com/fanshuyao/