CentOS 配置防火墙详解及实例
<p><strong> CentOS配置防火墙</strong></p>
<p>
昨天帮朋友配置CentOS服务器，一开始为了方便测试直接把防火墙关了，之后便需要配置好防火墙，网上找了几个防火墙规则都有错误，后来发现是博主发帖不认真，有太多字符错误，下面是我整理的亲测可用的防火墙规则的配置过程：</p>
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修改 iptables-config</p>
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首先修改iptables-config文件的一个配置项</p>
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<code class="bash plain">$ </code><code class="bash functions">vi</code> <code class="bash plain">/etc/sysconfig/iptables-config</code>
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把文件最后一行IPTABLES_MODULES="ip_conntrack_ftp" 改为#IPTABLES_MODULES="ip_conntrack_ftp" ，即注释掉那一行配置项</p>
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添加规则</p>
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<code class="bash plain">$ </code><code class="bash functions">vi</code> <code class="bash plain">/etc/sysconfig/iptables</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 -p tcp -m tcp --dport 3306 -j ACCEPT </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 -m 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 esp -j ACCEPT </code>
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<code class="bash plain">-A RH-Firewall-1-INPUT -p ah -j ACCEPT </code>
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<code class="bash plain">-A RH-Firewall-1-INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT </code>
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<code class="bash plain">-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 53 -j ACCEPT </code>
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<code class="bash plain">-A RH-Firewall-1-INPUT -p udp -m state --state NEW -m udp --dport 53 -j ACCEPT </code>
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<code class="bash plain">-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT </code>
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<code class="bash plain">-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 25 -j ACCEPT </code>
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<code class="bash plain">-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT </code>
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<code class="bash plain">-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 8080 -j ACCEPT </code>
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<code class="bash plain">-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m 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>
已经包含MySQL数据库的3306端口和Tomcat的8080端口，可根据需要增删端口。</p>
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