CentOS 7关闭firewalld启用iptables 开放端口

在CentOS7中，有很多CentOS 6中的常用服务发生了变化。

其中iptables是其中比较大的一个。防火墙iptables被firewalld取代。

本文将介绍，如果采用systemctl关闭firewalld，开启iptables。

1.关闭firewalld

[root@hwcentos70-01 system]# systemctl stop firewalld
[root@hwcentos70-01 system]# systemctl disable firewalld
[root@hwcentos70-01 system]# systemctl status firewalld
firewalld.service - firewalld - dynamic firewall daemon

Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled)

Active: inactive (dead)

Feb 26 13:48:00 hwcentos70-01 systemd[1]: Stopped firewalld - dynamic firewall daemon.

Feb 26 13:48:14 hwcentos70-01 systemd[1]: Starting firewalld - dynamic firewall daemon...

Feb 26 13:48:15 hwcentos70-01 systemd[1]: Started firewalld - dynamic firewall daemon.

Feb 26 13:49:23 hwcentos70-01 systemd[1]: Started firewalld - dynamic firewall daemon.

Feb 26 13:53:18 hwcentos70-01 systemd[1]: Stopping firewalld - dynamic firewall daemon...

Feb 26 13:53:18 hwcentos70-01 systemd[1]: Stopped firewalld - dynamic firewall daemon.

2.开启iptables

首先安装iptables：

[root@hwcentos70-01 system]#yum install -y iptables-services
[root@hwcentos70-01 system]# systemctl enable iptables
ln -s '/usr/lib/systemd/system/iptables.service' '/etc/systemd/system/basic.target.wants/iptables.service'

[root@hwcentos70-01 system]# systemctl start iptables
[root@hwcentos70-01 system]# systemctl status iptables
iptables.service - IPv4 firewall with iptables

Loaded: loaded (/usr/lib/systemd/system/iptables.service; enabled)

Active: active (exited) since Fri 2016-02-26 13:54:45 UTC; 6s ago

Process: 55539 ExecStart=/usr/libexec/iptables/iptables.init start (code=exited, status=0/SUCCESS)

Main PID: 55539 (code=exited, status=0/SUCCESS)

Feb 26 13:54:45 hwcentos70-01 iptables.init[55539]: iptables: Applying firewall rules: [ OK ]

Feb 26 13:54:45 hwcentos70-01 systemd[1]: Started IPv4 firewall with iptables.

此时iptables的命令都可以使用了：

[root@hwcentos70-01 system]# iptables -L
Chain INPUT (policy ACCEPT)

target prot opt source destination

Chain FORWARD (policy ACCEPT)

target prot opt source destination

Chain OUTPUT (policy ACCEPT)

target prot opt source destination

[root@hwcentos70-01 system]# service iptables save
iptables: Saving firewall rules to /etc/sysconfig/iptables:[ OK ]

3.开放5000端口

输入“vi /etc/sysconfig/iptables”,打开iptables的配置文件,输入之前按一下"i",然后添加一行"-A INPUT -m state --state NEW -m tcp -p tcp --dport 5000 -j ACCEPT",添加以后按一下ESC,输入":x",回车,就保存退出了

重启iptables,输入"service iptables restart",重启成功以后,,输入"service iptables status"，回车,就会显示正在生效的规则

启动监听5000的应用程序

4.测试

cmd(命令提示符)窗口,使用telnet命令进行测试,命令"telnet+空格+服务器IP+空格+5000",可以连接就会直接跳转到一个空白的窗口,连不上就会卡住一段时间,然后提示错误

查看网页