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+## 1、查询系统中安装的mysql/mariadb版本
+```shell
+rpm -qa | grep mysql
+rpm -qa | grep mariadb
+```
+### 2、卸载
+```shell
+rpm -e --nodeps mariadb-libs
+```
+### 3、安装mysql
+```
+# 以common -> libs -> client -> server顺序安装mysql
+yum -y localinstall mysql-community-common-5.7.41-1.el7.x86_64.rpm
+yum -y localinstall mysql-community-libs-5.7.41-1.el7.x86_64.rpm mysql-community-libs-compat-5.7.41-1.el7.x86_64.rpm
+yum -y localinstall mysql-community-client-5.7.41-1.el7.x86_64.rpm
+yum -y localinstall mysql-community-server-5.7.41-1.el7.x86_64.rpm
+```
+### (选项)4、修改端口/数据目录
+```shell
+[mysqld]
+port=3307
+datadir=/data/mysql
+```
+### 5、启动mysql
+```shell
+systemctl start mysqld
+```
+### 6、查看初始密码
+```shell
+grep 'temporary password' /var/log/mysqld.log
+```
+### 7、修改密码
+```sql
+mysql -u root -p
+set password = password("xxxxxxxx");
+flush privileges;
+```