Linux操作系统彻底删除MySQL——详细步骤

Linux彻底删除MySQL
注意：在安装另一个MySQL版本之前一定要把之前MySQL版本给卸载干净。

详细步骤如下：
**1、检查云服务器是否已经安装了MySQL：**

```bash
rpm -qa | grep mysql
```
如下所示：
```bash
mysql-community-release-el7-5.noarch
mysql-community-libs-5.6.51-2.el7.x86_64
mysql-community-client-5.6.51-2.el7.x86_64
mysql-community-server-5.6.51-2.el7.x86_64
mysql-community-common-5.6.51-2.el7.x86_64
```
**2、查看MySQL服务是否开启：**

```bash
systemctl status mysqld
```
如开启则须关闭，关闭MySQL服务：
```bash
systemctl stop mysqld
```

**3、查找含有MySQL的目录：**

```bash
find / -name mysql
```

如下所示：
```bash
/var/lib/mysql
/var/lib/mysql/mysql
/usr/local/mysql
/usr/lib64/mysql
/usr/share/mysql
/usr/bin/mysql
/etc/logrotate.d/mysql
/etc/selinux/targeted/active/modules/100/mysql
```

4、删除含有MySQL的目录，依次删除目录（根据自己查找出来的目录进行依次删除）：

```bash
rm -rf /var/lib/mysql
rm -rf /var/lib/mysql/mysql
rm -rf /usr/local/mysql
rm -rf /usr/lib64/mysql
rm -rf /usr/share/mysql
rm -rf /usr/bin/mysql
rm -rf /etc/logrotate.d/mysql
rm -rf /etc/selinux/targeted/active/modules/100/mysql
```

`注意：上面执行完后/etc/my.cnf不会删除掉，需要手动单独删除。`

```bash
rm -rf /etc/my.cnf
```

**5、查找MySQL安装的组件服务：**
```bash
rpm -qa|grep -i mysql
```
如下所示：

```bash
mysql-community-release-el7-5.noarch
mysql-community-libs-5.6.51-2.el7.x86_64
mysql-community-client-5.6.51-2.el7.x86_64
mysql-community-server-5.6.51-2.el7.x86_64
mysql-community-common-5.6.51-2.el7.x86_64
```

**6、卸载并删除查找出来的组件服务，依次删除目录（根据自己查找出来的目录进行依次删除）：**

```bash
rpm -ev mysql-community-release-el7-5.noarch
rpm -ev mysql-community-server-5.6.51-2.el7.x86_64
rpm -ev mysql-community-client-5.6.51-2.el7.x86_64
rpm -ev mysql-community-libs-5.6.51-2.el7.x86_64
rpm -ev mysql-community-common-5.6.51-2.el7.x86_64
```

`如果删除不了则加上--nodeps。例如：rpm -ev --nodeps mysql-community-libs-5.6.51-2.el7.x86_64`

**7、卸载完成后检查是否卸载成功：**

```bash
rpm -qa | grep -i mysql
```

```bash
systemctl start mysql
```

`如提示Failed to start mysql.service: Unit not found.则说明此时已尽卸载干净了。`

文章来源：
https://blog.csdn.net/Turniper/article/details/130397482