Linux中防火墙centos

一般的防火墙用下面这些简单的配置都能达到目的

1) 重启后生效
开启： chkconfig iptables on
关闭： chkconfig iptables off
2) 即时生效，重启后失效
开启： service iptables start
关闭： service iptables stop
需要说明的是对于Linux下的其它服务都可以用以上命令执行开启和关闭操作。
在开启了防火墙时，做如下设置，开启相关端口，
修改/etc/sysconfig/iptables 文件，添加以下内容：
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT

但是这次我遇到的防火墙不一样，是因为CentOS版本高的问题吧。

只能用下面的的命令关闭防火墙

Centos7中的防火墙调整为firewalld，试一下systemctl stop firewalld关闭防火墙。

以下转载自：http://linux.it.net.cn/CentOS/fast/2014/1102/7635.html

新安装的centos 7 发现有些程序端口是关闭的，想到了防火墙和selinux

selinx 好关闭 /etc/sysconfig/selinux 中 追加 SELINUX=disabled

防火墙以为也是很好弄，按照以前的老规矩，service iptables stop 或者 chkconfig --level 35 iptables off

重启后 运行 systemctl list-unit-files | grep ip  发现还有个ip6tables 没关  chkconfig --level 35 ip6tables off

再运行 systemctl list-unit-files | grep ip 发现全部都disables 还是不通

没办法，只有添加规则了，tptables -I INPUT 1 -p tcp --dport 6259 -j ACCEPT

然后service iptables save  端口通了

我想这个是不是个BUG ， 也许我没有找到方法，请告知

Centos7中的防火墙调整为firewalld，试一下systemctl stop firewalld关闭防火墙。
I installed CentOS 7 with minimal configuration (os + dev tools). I am trying to open 80 port for httpdservice, but something wrong with my iptables service ... what's wrong with it? What am I doing wrong?

# ifconfig/sbin/service iptables save
bash: ifconfig/sbin/service: No such file or directory

# /sbin/service iptables save
The service command supports only basic LSB actions (start, stop, restart, try-restart, reload, force-reload, status). For other actions, please try to use systemctl.

# sudo service iptables status
Redirecting to /bin/systemctl status  iptables.service
iptables.service
   Loaded: not-found (Reason: No such file or directory)
   Active: inactive (dead)

# /sbin/service iptables save
The service command supports only basic LSB actions (start, stop, restart, try-restart, reload, force-reload, status). For other actions, please try to use systemctl.

# sudo service iptables start
Redirecting to /bin/systemctl start  iptables.service
Failed to issue method call: Unit iptables.service failed to load: No such file or directory.

With RHEL 7 / CentOS 7, firewalld was introduced to manage iptables. IMHO, firewalld is more suited for workstations than for server environments.

It is possible to go back to a more classic iptables setup. First, stop and mask the firewalld service:

systemctl stop firewalld
systemctl mask firewalld

Then, install the iptables-services package:

yum install iptables-services

Enable the service at boot-time:

systemctl enable iptables

Managing the service

systemctl [stop|start|restart] iptables

Saving your firewall rules can be done as follows:

service iptables save

or

/usr/libexec/iptables/iptables.init save