详解centos6和centos7防火墙的关闭
<p><span><strong>CentOS6.5查看防火墙的状态：</strong></span></p>
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<code class="bash plain">$service iptable status</code>
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显示结果：</p>
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<code class="bash plain">$service iptable status</code>
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<code class="bash plain">Redirecting to </code><code class="bash plain">/bin/systemctl</code> <code class="bash plain">status iptable.service</code>
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<code class="bash plain">iptable.service</code>
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<code class="bash spaces"> </code><code class="bash plain">Loaded: not-found (Reason: No such </code><code class="bash functions">file</code> <code class="bash plain">or directory)</code>
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<code class="bash spaces"> </code><code class="bash plain">Active: inactive (dead) --表示防火墙已经关闭 </code>
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<span><strong> CentOS 6.5关闭防火墙</strong></span></p>
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<code class="bash plain"></code><code class="bash comments">#servcie iptables stop --临时关闭防火墙</code>
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<code class="bash plain"></code><code class="bash comments">#chkconfig iptables off --永久关闭防火墙 </code>
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<span><strong>CentOS 7.2关闭防火墙</strong></span></p>
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CentOS 7.0默认使用的是firewall作为防火墙，这里改为iptables防火墙步骤。</p>
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firewall-cmd --state #查看默认防火墙状态（关闭后显示notrunning，开启后显示running）</p>
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<code class="bash plain"></code><code class="bash comments">#firewall-cmd --state</code>
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<code class="bash plain">not running </code>
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检查防火墙的状态：</p>
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从centos7开始使用systemctl来管理服务和程序，包括了service和chkconfig。</p>
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<code class="bash plain"></code><code class="bash comments">#systemctl list-unit-files|grep firewalld.service --防火墙处于关闭状态</code>
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<code class="bash plain">firewalld.service disabled </code>
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或者</p>
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<code class="bash plain"></code><code class="bash comments">#systemctl status firewalld.service</code>
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<code class="bash plain">firewalld.service - firewalld - dynamic firewall daemon</code>
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<code class="bash spaces"> </code><code class="bash plain">Loaded: loaded (</code><code class="bash plain">/usr/lib/systemd/system/firewalld</code><code class="bash plain">.service; disabled; vendor preset: enabled)</code>
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<code class="bash spaces"> </code><code class="bash plain">Active: inactive (dead) </code>
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<span><strong> 关闭防火墙：</strong></span></p>
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systemctl stop firewalld.service #停止firewall<br>
systemctl disable firewalld.service #禁止firewall开机启动</p>
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<code class="bash plain"></code><code class="bash comments">#systemctl stop firewalld.service</code>
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<code class="bash plain"></code><code class="bash comments">#systemctl disable firewalld.service </code>
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<code class="plain plain">启动一个服务：systemctl start firewalld.service</code>
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<code class="plain plain">关闭一个服务：systemctl stop firewalld.service</code>
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<code class="plain plain">重启一个服务：systemctl restart firewalld.service</code>
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<code class="plain plain">显示一个服务的状态：systemctl status firewalld.service</code>
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<code class="plain plain">在开机时启用一个服务：systemctl enable firewalld.service</code>
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<code class="plain plain">在开机时禁用一个服务：systemctl disable firewalld.service</code>
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<code class="plain plain">查看服务是否开机启动：systemctl is-enabled firewalld.service;echo $?</code>
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<code class="plain plain">查看已启动的服务列表：systemctl list-unit-files|grep enabled </code>
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<p>
<span><strong>Centos 7 firewall 命令：</strong></span></p>
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查看已经开放的端口：</p>
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<code class="bash plain">firewall-cmd --list-ports</code>
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开启端口</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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命令含义：</p>
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–zone #作用域</p>
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–add-port=80/tcp #添加端口，格式为：端口/通讯协议</p>
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–permanent #永久生效，没有此参数重启后失效</p>
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重启防火墙</p>
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<code class="bash plain">firewall-cmd --reload </code><code class="bash comments">#重启firewall</code>
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<code class="bash plain">systemctl stop firewalld.service </code><code class="bash comments">#停止firewall</code>
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<code class="bash plain">systemctl disable firewalld.service </code><code class="bash comments">#禁止firewall开机启动</code>
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<code class="bash plain">firewall-cmd --state </code><code class="bash comments">#查看默认防火墙状态（关闭后显示notrunning，开启后显示running）</code>
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<span><strong>CentOS 7 以下版本 iptables 命令</strong></span></p>
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如要开放80，22，8080 端口，输入以下命令即可</p>
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<code class="bash plain">/sbin/iptables</code> <code class="bash plain">-I INPUT -p tcp --dport 80 -j ACCEPT</code>
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<code class="bash plain">/sbin/iptables</code> <code class="bash plain">-I INPUT -p tcp --dport 22 -j ACCEPT</code>
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<code class="bash plain">/sbin/iptables</code> <code class="bash plain">-I INPUT -p tcp --dport 8080 -j ACCEPT</code>
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然后保存：</p>
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<code class="bash plain">/etc/rc</code><code class="bash plain">.d</code><code class="bash plain">/init</code><code class="bash plain">.d</code><code class="bash plain">/iptables</code> <code class="bash plain">save</code>
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查看打开的端口：</p>
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<code class="bash plain">/etc/init</code><code class="bash plain">.d</code><code class="bash plain">/iptables</code> <code class="bash plain">status</code>
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<span><strong>关闭防火墙 </strong></span></p>
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1） 永久性生效，重启后不会复原</p>
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开启： chkconfig iptables on</p>
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关闭： chkconfig iptables off</p>
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2） 即时生效，重启后复原</p>
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开启： service iptables start</p>
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关闭： service iptables stop</p>
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查看防火墙状态： service iptables status </p>
<p>
<span><strong>下面说下CentOS7和6的默认防火墙的区别</strong></span></p>
<p>
CentOS 7默认使用的是firewall作为防火墙，使用iptables必须重新设置一下</p>
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1、直接关闭防火墙</p>
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<code class="bash plain">systemctl stop firewalld.service </code><code class="bash comments">#停止firewall</code>
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<code class="bash plain">systemctl disable firewalld.service </code><code class="bash comments">#禁止firewall开机启动</code>
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2、设置 iptables service</p>
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<code class="bash plain">yum -y </code><code class="bash functions">install</code> <code class="bash plain">iptables-services</code>
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<p>
如果要修改防火墙配置，如增加防火墙端口3306</p>
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<code class="bash functions">vi</code> <code class="bash plain">/etc/sysconfig/iptables</code>
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<p>
增加规则</p>
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<code class="bash plain">-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT</code>
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保存退出后</p>
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<code class="bash plain">systemctl restart iptables.service </code><code class="bash comments">#重启防火墙使配置生效</code>
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<code class="bash plain">systemctl </code><code class="bash functions">enable</code> <code class="bash plain">iptables.service </code><code class="bash comments">#设置防火墙开机启动</code>
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最后重启系统使设置生效即可。</p>
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<code class="bash plain">systemctl start iptables.service </code><code class="bash comments">#打开防火墙</code>
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<code class="bash plain">systemctl stop iptables.service </code><code class="bash comments">#关闭防火墙</code>
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<span><strong>解决主机不能访问虚拟机CentOS中的站点</strong></span></p>
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前阵子在虚拟机上装好了CentOS6.2，并配好了apache+php+mysql，但是本机就是无法访问。一直就没去折腾了。 </p>
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具体情况如下</p>
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1. 本机能ping通虚拟机</p>
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2. 虚拟机也能ping通本机</p>
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3.虚拟机能访问自己的web</p>
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4.本机无法访问虚拟机的web </p>
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后来发现是防火墙将80端口屏蔽了的缘故。 </p>
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检查是不是服务器的80端口被防火墙堵了，可以通过命令：telnet server_ip 80 来测试。</p>
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解决方法如下：</p>
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<code class="bash plain">/sbin/iptables</code> <code class="bash plain">-I INPUT -p tcp --dport 80 -j ACCEPT</code>
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然后保存：</p>
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<code class="bash plain">/etc/rc</code><code class="bash plain">.d</code><code class="bash plain">/init</code><code class="bash plain">.d</code><code class="bash plain">/iptables</code> <code class="bash plain">save</code>
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重启防火墙</p>
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<code class="bash plain">/etc/init</code><code class="bash plain">.d</code><code class="bash plain">/iptables</code> <code class="bash plain">restart</code>
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<strong>CentOS防火墙的关闭，关闭其服务即可： </strong></p>
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查看CentOS防火墙信息：/etc/init.d/iptables status</p>
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关闭CentOS防火墙服务：/etc/init.d/iptables stop</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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原文链接：http://www.cnblogs.com/zhangzhibin/p/6231870.html</p>
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