安装mysql

0检测是否安装mysql
rpm -qa | grep mysql

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1安装mysql
yum install mysql

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（wget需要自己安装yum -y install wget）

2下载mysql的repo源
wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm

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3安装解rpm文件
sudo rpm -ivh mysql57-community-release-el7-10.noarch.rpm --nodeps --force

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4安装mysql服务器
sudo yum install mysql-server

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5重启mysql服务
service mysqld restart

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6如果你忘记设置密码
可以打开mysql默认日志文件/var/log/mysqld.log，
找到A temporary password xxxxxx这里会显示零时密码，然后使用这个密码登录

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修改密码复杂度协议 set global validate_password_policy=0;

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修改密码长度协议 set global validate_password_length=1;

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set password for root@localhost = password('123456');

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2 另外一个大佬的下载方法

1安装 wget（有可以不安装）
yum install wget

2下载mysql的官方repo源
wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm

3安装解释器
yum -y install mysql57-community-release-el7-10.noarch.rpm

4安装mysql 服务器
yum -y install mysql-community-server

5启动mysql服务
systemctl start  mysqld.service

6查看mysql的运行状态（可以不执行）
systemctl status mysqld.service

7过滤log日志找到临时密码（因为我们没有设置mysql密码）
grep "password" /var/log/mysqld.log

8用临时密码登录
mysql -u root -p

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修改密码复杂度协议 set global validate_password_policy=0;

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修改密码长度协议 set global validate_password_length=1;

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set password for root@localhost = password('123456')

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原笔记博主https://blog.youkuaiyun.com/weixin_46014553?spm=1000.2115.3001.5343