Centos7.1防火墙开放端口快速方法
<p>例如安装Nagios后，要开放5666端口与服务器连接，命令如下：</p>
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<code class="bash plain"></code><code class="bash comments"># firewall-cmd --add-port=5666/tcp 即时打开，这里也可以是一个端口范围，如1000-2000/tcp</code>
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<code class="bash plain">success</code>
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<code class="bash plain"></code><code class="bash comments"># firewall-cmd --permanent --add-port=5666/tcp 写入配置文件</code>
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<code class="bash plain">success</code>
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<code class="bash plain"></code><code class="bash comments"># firewall-cmd --reload 重启防火墙</code>
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<code class="bash plain">success</code>
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<code class="bash plain"></code><code class="bash comments">#</code>
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<strong>CentOS 7开放端口：</strong></p>
<p>
CentOS升级到7之后，发现无法使用iptables控制Linuxs的端口，google之后发现Centos 7使用firewalld代替了原来的iptables。下面记录如何使用firewalld开放Linux端口：</p>
<p>
<span><strong>开启端口</strong></span></p>
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<code class="bash plain">firewall-cmd --zone=public --add-port=80</code><code class="bash plain">/tcp</code> <code class="bash plain">--permanent</code>
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<span><strong>命令含义：</strong></span></p>
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--zone #作用域<br>
--add-port=80/tcp #添加端口，格式为：端口/通讯协议<br>
--permanent #永久生效，没有此参数重启后失效</p>
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<span><strong>重启防火墙</strong></span></p>
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<code class="bash plain">firewall-cmd --reload</code>
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<strong>设置CentOS防火墙开放端口：</strong></p>
<p>
在我们使用CentOS系统的时候，CentOS防火墙有时是需要改变设置的。CentOS防火墙默认是打开的，设置CentOS防火墙开放端口方法如下：</p>
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打开iptables的配置文件：<span>vi /etc/sysconfig/iptables</span></p>
<p>
修改CentOS防火墙时注意：一定要给自己留好后路,留VNC一个管理端口和SSh的管理端口</p>
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下面是一个iptables的示例：</p>
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<code class="bash comments"># Firewall configuration written by system-config-securitylevel</code>
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<code class="bash comments"># Manual customization of this file is not recommended.</code>
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<code class="bash plain">*filter</code>
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<code class="bash plain">:INPUT ACCEPT </code>
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<code class="bash plain">:FORWARD ACCEPT </code>
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<code class="bash plain">:OUTPUT ACCEPT </code>
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<code class="bash plain">:RH-Firewall-1-INPUT - </code>
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<code class="bash plain">-A INPUT -j RH-Firewall-1-INPUT</code>
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<code class="bash plain">-A FORWARD -j RH-Firewall-1-INPUT</code>
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<code class="bash plain">-A RH-Firewall-1-INPUT -i lo -j ACCEPT</code>
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<code class="bash plain">-A RH-Firewall-1-INPUT -p icmp –icmp-</code><code class="bash functions">type</code> <code class="bash plain">any -j ACCEPT</code>
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<code class="bash plain">-A RH-Firewall-1-INPUT -p 50 -j ACCEPT</code>
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<code class="bash plain">-A RH-Firewall-1-INPUT -p 51 -j ACCEPT</code>
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<code class="bash plain">-A RH-Firewall-1-INPUT -m state –state ESTABLISHED,RELATED -j ACCEPT</code>
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<code class="bash plain">-A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 53 -j ACCEPT</code>
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<code class="bash plain">-A RH-Firewall-1-INPUT -m state –state NEW -m udp -p udp –dport 53 -j ACCEPT</code>
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<code class="bash plain">-A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 22 -j ACCEPT</code>
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<code class="bash plain">-A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 25 -j ACCEPT</code>
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<code class="bash plain">-A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 80 -j ACCEPT</code>
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<code class="bash plain">-A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 443 -j ACCEPT</code>
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<code class="bash plain">-A RH-Firewall-1-INPUT -j REJECT –reject-with icmp-host-prohibited</code>
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<code class="bash plain">COMMIT</code>
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<p>
修改CentOS防火墙需要注意的是，你必须根据自己服务器的情况来修改这个文件。</p>
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举例来说，如果你不希望开放80端口提供web服务，那么应该相应的删除这一行：<br><span>-A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 80 -j ACCEPT</span></p>
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全部修改完之后重启<span>iptables:service iptables restart</span></p>
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你可以验证一下是否规则都已经生效：<span>iptables -L</span></p>
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这样，我们就完成了CentOS防火墙的设置修改。</p>
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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。</p>
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