安装MySQL数据库

1.下载并安装MySQL官方的Yum Repository
wget http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm
yum -y install mysql57-community-release-el7-10.noarch.rpm
yum -y install mysql-community-server --nogpgcheck

2.启动 MySQL 数据库
systemctl start mysqld.service

3.查看MySQL初始密码
grep "password" /var/log/mysqld.log

4.登录数据库
mysql -uroot -p

5.修改MySQL默认密码
set global validate_password_policy=0; #修改密码安全策略为低（只校验密码长度，至少8位）
ALTER USER 'root'@'localhost' IDENTIFIED BY '12345678';

6.授予root用户远程管理权限
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '12345678';

7.输入exit退出数据库