1、查询dhcp有没有被安装，如下没有被安装
[zfp@localhost ~]$ rpm -q dhcp
package dhcp is not installed
[zfp@localhost ~]$
2、查询yum网络源中有关dhcp的rpm包
[root@localhost zfp]# yum list |grep dhcp
dhcp.x86_64 12:4.1.1-53.P1.el6.centos.1 updates
dhcp-common.x86_64 12:4.1.1-53.P1.el6.centos.1 updates
dhcp-devel.i686 12:4.1.1-53.P1.el6.centos.1 updates
dhcp-devel.x86_64 12:4.1.1-53.P1.el6.centos.1 updates
sblim-cmpi-dhcp.i686 1.0-1.el6 base
sblim-cmpi-dhcp.x86_64 1.0-1.el6 base
sblim-cmpi-dhcp-devel.i686 1.0-1.el6 base
sblim-cmpi-dhcp-devel.x86_64 1.0-1.el6 base
sblim-cmpi-dhcp-test.x86_64 1.0-1.el6 base
3、安装dhcp
[root@localhost zfp]# yum install dhcp -y
4、查询是否安装成功
[root@localhost zfp]# rpm -q dhcp
dhcp-4.1.1-53.P1.el6.centos.1.x86_64
[root@localhost zfp]#
查询安装的含有dhcp字符串包名的rpm包
[root@localhost zfp]# rpm -qa |grep dhcp
dhcp-common-4.1.1-53.P1.el6.centos.1.x86_64
dhcp-4.1.1-53.P1.el6.centos.1.x86_64
5、修改配置文件/etc/dhcp/dhcpd.conf
不同的发行版不一定是/etc/dhcp/dhcpd.conf这个文件，也可能是/etc/dhcpd.conf，centos6.5发行版是/etc/dhcp/dhcpd.conf
[root@localhost zfp]#vim /etc/dhcp/dhcpd.conf
ddns-update-style interim; #表示dhcp服务器和dns服务器的动态信息更新模式
ignore client-updates; #忽略客户端更新
subnet 192.168.145.0 netmask 255.255.255.0 { #意思是我所分配的ip地址所在的网段为192.168.145.0 子网掩码为255.255.255.0
range 192.168.145.200 192.168.145.210; #租用IP地址的范围
option domain-name-servers 8.8.8.8;
option domain-name "example.org";
option routers 192.168.145.100; #路由器地址，这里是当前 dhcp 机器的IP地址
option subnet-mask 255.255.255.0; #子网掩码
default-lease-time 600; #默认租约时间
max-lease-time 7200; #最大租约时间
#host myhost { #设置主机声明
#hardware ethernet 08:00:27:2C:30:8C; #指定dhcp客户的mac地址
#fixed-address 192.168.145.155; #给指定的mac地址分配ip
# }
}
[root@localhost zfp]#vim /etc/sysconfig/dhcpd
DHCPDARGS=eth0 #指定在eth0网卡上提供dhcpserver服务
6、开启dhcp服务
[root@localhost zfp]# service dhcpd status
dhcpd (pid 4478) 正在运行...
[root@localhost zfp]#
如果有报错，查看dhcp服务开启的时候，报什么错误cat /var/log/messages 或者tail -f /var/log/messages &
如下是正常开启dhcp服务的log信息
Jan 1 03:09:42 localhost dhcpd: Internet Systems Consortium DHCP Server 4.1.1-P1
Jan 1 03:09:42 localhost dhcpd: Copyright 2004-2010 Internet Systems Consortium.
Jan 1 03:09:42 localhost dhcpd: All rights reserved.
Jan 1 03:09:42 localhost dhcpd: For info, please visit https://www.isc.org/software/dhcp/
Jan 1 03:09:42 localhost dhcpd: Not searching LDAP since ldap-server, ldap-port and ldap-base-dn were not specified in the config file
Jan 1 03:09:42 localhost dhcpd: Wrote 0 leases to leases file.
Jan 1 03:09:42 localhost dhcpd: Listening on LPF/eth0/00:0c:29:9b:2d:be/192.168.145.0/24
Jan 1 03:09:42 localhost dhcpd: Sending on LPF/eth0/00:0c:29:9b:2d:be/192.168.145.0/24
Jan 1 03:09:42 localhost dhcpd: Sending on Socket/fallback/fallback-net
[root@localhost network-scripts]# netstat -anulp | grep :67
udp 0 0 0.0.0.0:67 0.0.0.0:* 4591/dhcpd
[root@localhost network-scripts]#
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