Centos下IP与DNS设置方法详解
<p>本文较为详细的讲述了Centos下IP与DNS设置方法。分享给大家供大家参考，具体如下：</p>
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<strong>1、CentOS 修改DNS</strong></p>
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修改对应网卡的DNS的配置文件</p>
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<code class="bash comments"># vi /etc/resolv.conf</code>
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修改以下内容</p>
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<code class="bash plain">nameserver 8.8.8.8 </code><code class="bash comments">#google域名服务器</code>
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<code class="bash plain">nameserver 8.8.4.4 </code><code class="bash comments">#google域名服务器</code>
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<strong>2、CentOS 修改网关</strong></p>
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修改对应网卡的网关的配置文件</p>
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<code class="bash plain"></code><code class="bash comments"># vi /etc/sysconfig/network</code>
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修改以下内容</p>
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NETWORKING=yes(表示系统是否使用网络，一般设置为yes。如果设为no，则不能使用网络，而且很多系统服务程序将无法启动)<br>
HOSTNAME=centos(设置本机的主机名，这里设置的主机名要和/etc/hosts中设置的主机名对应)<br>
GATEWAY=192.168.1.1(设置本机连接的网关的IP地址。例如，网关为10.0.0.2)</p>
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<strong>3、CentOS 修改IP地址</strong></p>
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修改对应网卡的IP地址的配置文件</p>
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<code class="bash comments"># vi /etc/sysconfig/network-scripts/ifcfg-eth0</code>
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修改以下内容</p>
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DEVICE=eth0 #描述网卡对应的设备别名，例如ifcfg-eth0的文件中它为eth0<br>
BOOTPROTO=static #设置网卡获得ip地址的方式，可能的选项为static，dhcp或bootp，分别对应静态指定的 ip地址，通过dhcp协议获得的ip地址，通过bootp协议获得的ip地址<br>
BROADCAST=192.168.0.255 #对应的子网广播地址<br>
HWADDR=00:07:E9:05:E8:B4 #对应的网卡物理地址<br>
IPADDR=12.168.1.2 #如果设置网卡获得 ip地址的方式为静态指定，此字段就指定了网卡对应的ip地址<br>
IPV6INIT=no<br>
IPV6_AUTOCONF=no<br>
NETMASK=255.255.255.0 #网卡对应的网络掩码<br>
NETWORK=192.168.1.0 #网卡对应的网络地址<br>
ONBOOT=yes #系统启动时是否设置此网络接口，设置为yes时，系统启动时激活此设备</p>
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<strong>4、重新启动网络配置</strong></p>
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<code class="bash comments"># service network restart</code>
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或</p>
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<code class="bash comments"># /etc/init.d/network restart</code>
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<span>修改 IP 地址</span></p>
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即时生效:</p>
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<code class="bash comments"># ifconfig eth0 192.168.0.2 netmask 255.255.255.0</code>
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启动生效:</p>
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<span>修改 /etc/sysconfig/network-scripts/ifcfg-eth0</span></p>
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修改网关 Default Gateway</p>
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即时生效:</p>
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<code class="bash comments"># route add default gw 192.168.0.1 dev eth0</code>
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启动生效:</p>
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<span>修改 /etc/sysconfig/network</span></p>
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修改 DNS</p>
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<span>修改/etc/resolv.conf</span></p>
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修改后可即时生效，启动同样有效</p>
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<span>修改 host name</span></p>
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即时生效:</p>
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<code class="bash comments"># hostname centos1</code>
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启动生效:</p>
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<span>修改/etc/sysconfig/network</span></p>
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手动更改centos为静态IP</p>
<p>
1，先搜索了一下，得到以下解释</p>
<p>
IP IP地址<br>
Netmark 子网掩码<br>
Gateway 默认网关<br>
HostName 主机名称<br>
DomainName 域名<br>
DNS DNS的IP</p>
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2，需要修改的文件常有</p>
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/etc/sysconfig/network<br>
/etc/sysconfig/network-scripts/ifcfg-eth0<br>
/etc/resolv.conf<br>
/etc/hosts</p>
<p>
出现'connect:Network is unreachable error'问题，VirtualBox采用的是Bridged Adapter的方式连接。</p>
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通过修改/etc/sysconfig/network-scripts/ifcfg-eth0修改虚拟机的IP地址已经network和netmask。</p>
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发现能ping同network和netmask，于是断定应该是虚拟机操作系统的路由配置问题，尝试直接修改系统文件/etc/sysconfig/network-scripts/route-eth0添加'defult via 192.168.0.1′（192.168.0.1是我的路由器的IP地址，可以根据自身情况修改）。</p>
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我跑到/etc/sysconfig/network-scripts/目录下发现压根儿没有route-eth0这个文件，于是自己创建了一个，将'defult via 192.168.0.1′添加到文件中。</p>
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运行'/etc/init.d/network restart'重启network，一切ok！原来问题果真是出在路由上面。</p>
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其实我原来已经使用过route add命令配置过路由了，只是它在重启之后就失效了，真是有点大意了</p>
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希望本文所述对大家CentOS服务器管理有所帮助。</p>
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