为什么要写这个呢，是因为我太好忘了，偏偏我的服务器都是centos的，每次都要找好久，算是个笔记吧

在这里介绍使用yum安装mysql

你可能要准备的软件包

yum install -y wget

第一步：找到yum的下载地址，不过这个并不好找（mysql网站是英文的），不过的他也是有yum仓库的

yum库地址

列举部分下载地址

https://repo.mysql.com/mysql57-community-release-el5-7.noarch.rpm
https://repo.mysql.com/mysql57-community-release-el5-8.noarch.rpm
https://repo.mysql.com/mysql57-community-release-el5.rpm
https://repo.mysql.com/mysql57-community-release-el6-10.noarch.rpm
https://repo.mysql.com/mysql57-community-release-el6-11.noarch.rpm
https://repo.mysql.com/mysql57-community-release-el6-7.noarch.rpm
https://repo.mysql.com/mysql57-community-release-el6-8.noarch.rpm
https://repo.mysql.com/mysql57-community-release-el6-9.noarch.rpm
https://repo.mysql.com/mysql57-community-release-el6.rpm
https://repo.mysql.com/mysql57-community-release-el7-10.noarch.rpm
https://repo.mysql.com/mysql57-community-release-el7-11.noarch.rpm
https://repo.mysql.com/mysql57-community-release-el7-7.noarch.rpm
https://repo.mysql.com/mysql57-community-release-el7-8.noarch.rpm
https://repo.mysql.com/mysql57-community-release-el7-9.noarch.rpm
https://repo.mysql.com/mysql57-community-release-el7.rpm

我们挑一个进行安装，我喜欢这个mysql57-community-release-el7-10.noarch.rpm

1. 命令下载

   wget https://repo.mysql.com/mysql57-community-release-el7-10.noarch.rpm

2. 安装yum库

   yum -y install mysql57-community-release-el7-10.noarch.rpm

3. 安装mysql服务

   yum -y install mysql-community-server

4. 启动mysql

   systemctl start mysqld.service

5. 查看mysql运行状态

   systemctl status mysqld.service

6. 查看随机密码

   grep "password" /var/log/mysqld.log

7. 使用随机密码登录mysql

   mysql -uroot -p

8. 修改数据库密码，不修改无法操作数据库，请注意密码默认是8位大小写字母加数字和特殊符号（是必须）

   ALTER USER 'root'@'localhost' IDENTIFIED BY 'new password';

9. 你也可以查看一下密码策略

   show variables like '%password%';

至此mysql数据库安装完成，你可能还需要mysql远程访问、基本操作

update user set host = '%' where user = 'root';
flush privileges;
exit

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