CentOS7 yum方式 安装mysql 5.7.28步骤

CentOS7系统yum方式安装MySQL5.7

###https://www.cnblogs.com/bigbrotherer/p/7241845.html#top
最新的yum源可以去http://dev.mysql.com/downloads/repo/yum下载

1、获取mysql官方yum repository 可安装版的包；
    wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm
2、安装下载rpm包；
    yum -y install mysql57-community-release-el7-10.noarch.rpm
3、安装mysql-community-server
    yum -y install mysql-community-server
4、启动mysql;
    systemctl start  mysqld.service
    systemctl status  mysqld.service
5、登录mysql,查找初始密码；
    grep "password" /var/log/mysqld.log
6、临时修改密码策略，否则密码要求复杂度较高，8位以上，大小写字母加特殊符号；
    set global validate_password_policy=0;
    set global validate_password_length=1;

7、设置root密码；
    ALTER USER ‘root‘@‘localhost‘ IDENTIFIED BY ‘123456‘;
    set password=password(‘root‘);
    SHOW VARIABLES LIKE ‘validate_password%‘;
8、卸载掉mysql的yum repository
    yum -y remove mysql57-community-release-el7-10.noarch

9、远程连接关闭防火墙：
    systemctl status firewalld
    systemctl stop firewalld
10、修改用户root登录host配置；
    use mysql;
    update user set host=‘%‘ where user=‘root‘;