liunx centos 防火墙

查看防火墙状态

systemctl status firewalld

查看已经开放的端口

firewall-cmd --list-ports

添加端口3306

firewall-cmd --zone=public --add-port=3306/tcp --permanent

重启防火墙

firewall-cmd --reload

数据库开放账号可以外网登陆

mysql -u root -p
# 首先登录上mysql
use mysql;
select user,host from user where user='root';
update user set host='%' where user='root';
# 刷新权限
flush priveleges
#FLUSH PRIVILEGES;

# 允许root用户远程连接
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '数据库密码' WITH GRANT OPTION;