https://www.cnblogs.com/moxiaoan/p/5683743.html
https://blog.youkuaiyun.com/qq_15030351/article/details/79733806
https://blog.youkuaiyun.com/Post_Yuan/article/details/78603212
CentOS 7.0默认使用的是firewall作为防火墙,使用iptables必须重新设置一下
1、直接关闭防火墙
systemctl stop firewalld.service #停止firewall
systemctl disable firewalld.service #禁止firewall开机启动
2、设置 iptables service
yum -y install iptables-services
如果要修改防火墙配置,如增加防火墙端口3306
vi /etc/sysconfig/iptables
增加规则
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT
保存退出后
systemctl restart iptables.service #重启防火墙使配置生效
systemctl enable iptables.service #设置防火墙开机启动
最后重启系统使设置生效即可。
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CentOS6关闭防火墙使用以下命令,
//临时关闭
service iptables stop
//禁止开机启动
chkconfig iptables off
CentOS7中若使用同样的命令会报错,
stop iptables.service
Failed to stop iptables.service: Unit iptables.service not loaded.
这是因为CentOS7版本后防火墙默认使用firewalld,因此在CentOS7中关闭防火墙使用以下命令,
//临时关闭
systemctl stop firewalld
//禁止开机启动
systemctl disable firewalld
Removed symlink /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
当然,如果安装了iptables-service,也可以使用下面的命令,
yum install -y iptables-services
//关闭防火墙
service iptables stop
Redirecting to /bin/systemctl stop iptables.service
//检查防火墙状态
service iptables status
Redirecting to /bin/systemctl status iptables.service
鈼iptables.service - IPv4 firewall with iptables
Loaded: loaded (/usr/lib/systemd/system/iptables.service; disabled; vendor preset: disabled)
Active: inactive (dead)
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