获取yum repository

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wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm

yum 安装

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

启动mysql

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systemctl start  mysqld.service
systemctl status mysqld.service

找到数据库密码

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

登录数据库

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mysql -uroot -p

修改密码规则并修改密码

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mysql> set global validate_password_policy=0;
mysql> set global validate_password_length=1;
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'new password';
mysql> exit;

删除yum reposiory

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yum -y remove mysql57-community-release-el7-10.noarch