centos 安装MySQL5.7

1、配置yum源

   一、下载yum源 wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm

    二、安装 yum localinstall mysql57-community-release-el7-8.noarch.rpm

    三、检查是否安装成功 yum repolist enabled | grep "mysql.*-community.*" 

 2、安装MySQL

    一、安装 yum install mysql-community-server

    二、启动MySQL服务 systemctl start mysqld

    三、查看是否启动成功 systemctl status mysqld

3、MySQL相关设置

    一、默认密码再也不是空，安装时会随机在/var/log/mysqld.log文件生成一个密码，查看临时密码：

    grep 'temporary password' /var/log/mysqld.log,

    二、登陆后修改密码：set password for 'root'@'localhost'=password('MyNewPass4!');（注意：密码必须包含大小写字母、数字和特殊符号，而且长度不能少于8位）

    3 、设置远程链接（不是会报Host ‘XXX’ is not allowed to connect to this MySQL server错误）

    mysql>use mysql;

    mysql>update user set host ='%'where user ='root' and host ='localhost';

   mysql>GRANT ALL PRIVILEGES ON *.* TO '（用户名）'@'%' IDENTIFIED BY '（密码）' WITH GRANT OPTION;

    mysql>flush privileges;