最简单的DHCP服务

这几天在准备网络安装linux操作系统。最后决定用pxe + kickstart 的方式完成。原理、方案弄完了之后，开始搭建，结果被DHCP给挡住了。这不就得研究研究最简单最实用的DHCP使用方法。

* 红色的是必须有

* 绿色的是要注意

* 蓝色的是包安装时，要有的程序包

1. DHCP的实现

2. 配置文件实例

实例1

实例2

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1. DHCP的实现

DHCP服务必须给本网段提供一个地址池。

# yum -y install dhcp-devel

# rpm -aq | grep dhcp

dhcp-4.1.1-38.P1.el6.CentOS.i686

dhcp-devel-4.1.1-38.P1.el6.centos.i686

# cp /usr/share/doc/dhcp-4.1.1/dhcpd.conf.sample /etc/dhcp/dhcpd.conf

# vi dhcpd.conf

ddns-update-style interim( 这项不能少，否则服务起不来的 )

default-lease-time 21600;

max-lease-time 43200;

option domain-name “test.com”;

option domain-name-servers 192.168.1.1,202.106.0.20;

subnet 192.168.1.0 netmask 255.255.2550 {

range 192.168.1.128 192.168.1.254;

option subnet-mask 255.255.255.0;

option routers 192.168.1.1;

}

host server01 {

hardware ethernet 0:c0:c3:22:46:81;

fixed-address 192.168.1.11;

option subnet-mask 255.255.255.0;

option routers 192.168.1.1;

}

subnet 117.34.70.0 netmask 255.255.255.0 {

default-lease-time 21600;

max-lease-time 43200;

option routers 117.34.70.1;

option subnet-mask 255.255.255.0;

}

一台主机有多块网卡，需要在某个网卡上启用DHCP服务时，需要配置如下：

# vi /etc/sysconfig/dhcpd

# Command line options here

DHCPDARGS=eth0

------------------------------

2. 配置文件实例

简单的样例：（红色部分必须有）

# vi /etc/dhcp/dhcpd.conf

# dhcpd.conf

# Sample configuration file for ISC dhcpd

# option definitions common to all supported networks...

option domain-name "example.org";

option domain-name-servers ns1.example.org, ns2.example.org;

default-lease-time 600;

max-lease-time 7200;

# Use this to enble / disable dynamic dns updates globally.

ddns-update-style none;

# If this DHCP server is the official DHCP server for the local

# network, the authoritative directive should be uncommented.

#authoritative;

# Use this to send dhcp log messages to a different log file (you also

# have to hack syslog.conf to complete the redirection).

log-facility local7;

# No service will be given on this subnet, but declaring it helps the

# DHCP server to understand the network topology.

subnet 117.34.73.0 netmask 255.255.255.0 {

}

subnet 10.152.187.0 netmask 255.255.255.0 {

}

# vi /etc/dhcp/dhcpd.conf

default-lease-time 600;

max-lease-time 7200;

ddns-update-style none;

subnet 117.34.73.0 netmask 255.255.255.0 {

}