日常问题--开启阿里云mysql远程登录

1. 关闭防火墙firewall

    systemctl stop firewalld.service
    systemctl disable firewalld.service
    systemctl mask firewalld.service
   

2. 安装iptables

    yum install iptables-services -y
   

3. 启动设置防火墙

    systemctl enable iptables
    systemctl start iptables
   

4. 使用iptables开启3306端口

    iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT
    service iptabels save
    service iptables restart
   

5. 开启mysql远程授权

    GRANT ALL PRIVILEGES ON *.* TO 'root'@'192.168.1.100' IDENTIFIED BY 'ABC123' WITH GRANT OPTION;
    flush privileges;
   

6. window开启telnet检查是否能连通3306端口
   window/启用或关闭Windows功能/telnet客户端
   telnet 47.9.27.92 3306

7. 发现无法连通3306端口，查原因发现是没有在阿里云控制台添加入口端口规则
   阿里云控制台/云ecs/网站和安全/安全组/安全组规则/添加规则（加入3306端口）