CentOS7.9安装MySql5.7教程，一次性成功

注：安装前先彻底卸载，防止出现这样那样的错误，卸载链接请参考 ​​彻底卸载mysql5.7​​  。我购买的是华为云服务器，装的是CentOS7.9系统，自带了华为云的镜像，所以无需添加国内镜像源了，

# wget https://dev.mysql.com/get/mysql57-community-release-el7-9.noarch.rpm
# rpm -ivh mysql57-community-release-el7-9.noarch.rpm

2、可以看下本地已经多了两个源文件。​​

# yum install mysql-server

4、启动mysql服务

# systemctl start mysqld
# systemctl status mysqld

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# grep password /var/log/mysqld.log

 6、修改密码

# mysqladmin -u root -p password 'WWW.1.com'

 7、登陆Mysql

# mysql -u root -p

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