一.安装

1.下载mysql压缩包

复制> [root@zhou etc]# wget http://repo.mysql.com/mysql80-community-release-el7.rpm
> 版本可自行选择，后面的解压一致就行
>

2.解压缩

复制> rpm -Uvh mysql80-community-release-el7.rpm
>

3.安装MySQL服务端

复制> yum install  -y  mysql-community-server
>

4.更改配置文件（为后续的导入数据库准备）

[root@zhou ~]# vi /etc/my.cnf

在my.cnf中的[mysqld]下面（位置不能错）加上lower_case_table_names=1这句（1表示不区分大小写，0区分大小写），保存重新启动mysql。

5.启动mysql

复制> service mysqld start
> systemctl start mysqld.service
>

6.检查mysql 的运行状态(可省略)

复制> service mysqld status
> systemctl status mysqld.service
> 上面两个命令是一个意思
>

7.获取临时密码

Mysql5.7默认安装之后root是有密码的。

[root@zhou ~]# grep ‘temporary password’ /var/log/mysqld.log #注意单引号是英文的
2020-11-14T08:08:45.867775Z 1 [Note] A temporary password is generated for root@localhost: urlunfhoa1!M

###这里临时密码是urlunfhoa1!M

8.登陆MySQL并修改密码

[root@zhou ~]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.32

Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type ‘help;’ or ‘\h’ for help. Type ‘\c’ to clear the current input statement.

mysql> ALTER USER ‘root‘@’localhost’ IDENTIFIED BY ‘000000’;

注：密码太简单会报错

ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

执行以下语句即可

复制> > set global validate_password.policy=0;
> > set global validate_password.length=4;
> >

ALTER USER 'root'@'localhost' IDENTIFIED BY '000000';

二.卸载

1.关闭MySQL

service mysqld stop

2.查看安装的mysql

rpm -qa|grep -i mysql

3.卸载安装的mysql

rpm -ev mysql-community-client-8.0.11-1.el7.x86_64 –nodeps

rpm -ev mysql-community-common-8.0.11-1.el7.x86_64 –nodeps

4.删除mysql相关目录

5.删除my.cnf

rm -rf /etc/my.cnf

6.检查卸载情况

rpm -qa|grep -i mysql 显示为空，卸载完毕。