背景：
某单位需要配置一台DHCP服务器给桌面PC机分配IP地址。 这些PC机分配到二个VLAN中，为便于ip管理和降低公司管理成本搭建公司内部的DHCP服务器。
IP地址规划与配置
网络 IP地址范围 网关 备份VLAN1
192.168.188.100-192.168.188.253/24
排除 192.168.188.160到192.168.188.169 192.168.188.2VLAN2 192.168.189.100-192.168.189.253/24 192.168.189.2
DHCP服务器为ZZyh1.linuxidc.LOCAL，其IP地址为192.168.188.15。
此单位的DNS服务器的地址为192.168.188.15、192.168.188.16
需要将192.168.188.111保留给无法配置静态IP地址的打印机，其MAC地址为00:12:34:56:78:90
VLAN1的地址租约是3天，VLAN2的地址租约是8天
SUSE Linux 11 pxe+DHCP+tftp+ftp 无人值守安装
zzyh1上的DHCP配置
查看版本信息
[root@localhost~]# uname -a
Linuxlocalhost.localdomain 3.10.0-123.el7.x86_64 #1 SMP Mon Jun 30 12:09:22 UTC 2014x86_64 x86_64 x86_64 GNU/Linux
[root@localhost~]# cat /etc/RedHat-release
CentOSLinux release 7.0.1406 (Core)
更该主机名
[root@zzyh1~]# vi /etc/hostname
[root@zzyh1~]# cat /etc/hostname
zzyh1.linuxidc.local
安装
#mount /dev/cdrom /media //挂在光驱
/dev/sr0on /media type iso9660 (ro,relatime)
#cd /media/Packages //进入目录
[root@zzyh1Packages]# ls dhcp*
dhcp-4.2.5-27.el7.centos.x86_64.rpm
dhcp-common-4.2.5-27.el7.centos.x86_64.rpm
dhcp-libs-4.2.5-27.el7.centos.x86_64.rpm
安装支持包
[root@zzyh1Packages]# rpm -vihdhcp-4.2.5-27.el7.centos.x86_64.rpm
warning:dhcp-4.2.5-27.el7.centos.x86_64.rpm: Header V3 RSA/SHA256 Signature, key IDf4a80eb5: NOKEY
Preparing... ################################# [100%]
Updating/ installing...
1:dhcp-12:4.2.5-27.el7.centos ################################# [100%]
查看安装后生成的配置文件
[root@zzyh1Packages]# rpm -qc dhcp
/etc/dhcp/dhcpd.conf
/etc/dhcp/dhcpd6.conf
/etc/openldap/schema/dhcp.schema
/etc/sysconfig/dhcpd
/var/lib/dhcpd/dhcpd.leases
/var/lib/dhcpd/dhcpd6.leases
[root@zzyh1Packages]# cd /etc/dhcp
[root@zzyh1dhcp]# ls
dhclient.d dhcpd6.conf dhcpd.conf
配置DHCP的文件
编辑前备份
[root@zzyh1 dhcp]# cpdhcpd.conf dhcpd.conf.origin
[root@zzyh1dhcp]# cat /etc/dhcp/dhcpd.conf
#
# DHCPServer Configuration file.
# see /usr/share/doc/dhcp*/dhcpd.conf.example
# see dhcpd.conf(5) man page
#
编辑DHCP的配置文件
# vi/etc/dhcp/dhcpd.conf //编辑下面内容
optiondomain-name "linuxidc.local";
optiondomain-name-servers 192.168.188.11, 192.168.188.12;
default-lease-time691200;
max-lease-time691200;
subnet192.168.188.0 netmask 255.255.255.0 {
range 192.168.188.100 192.168.188.159;
range 192.168.188.170 192.168.188.253;
default-lease-time 259200;
max-lease-time 259200;
option routers 192.168.188.2;
}
subnet192.168.189.0 netmask 255.255.255.0 {
range 192.168.189.100 192.168.189.253;
option routers 192.168.189.2;
}
host printer1 {
hardware ethernet 00:12:34:56:78:90;
fixed-address 192.168.188.111;
}
重启DHCP服务
配置DHCPD为自动 启动, 这在CentOS 7上的新的变化 了
# chkconfig dhcpd on //设置自动启动
Note:Forwarding request to 'systemctl enable dhcpd.service'.
ln -s'/usr/lib/systemd/system/dhcpd.service''/etc/systemd/system/multi-user.target.wants/dhcpd.service'
#systemctl enable dhcpd
# systemctl is-enabled dhcpd
enabled
测试
在一台Windows客户机上进行测试
当用户租用到IP后
#tail /var/log/messages //查看日志的命令
#tail /var/lib/dhcpd/dhcpd/leases //只查看dhcp的日志
分配Ip的日志
Aug 2402:04:34 zzyh1 dhcpd: Listening onLPF/eno16777728/00:0c:29:e0:40:8a/192.168.188.0/24
Aug 2402:04:34 zzyh1 dhcpd: Sending on LPF/eno16777728/00:0c:29:e0:40:8a/192.168.188.0/24
Aug 2402:04:34 zzyh1 dhcpd: Sending on Socket/fallback/fallback-net
Aug 2402:06:23 zzyh1 dhcpd: DHCPDISCOVER from 00:0c:29:9c:6d:9a via eno16777728
Aug 2402:06:24 zzyh1 dhcpd: DHCPOFFER on 192.168.188.100 to 00:0c:29:9c:6d:9a (zzyh)via eno16777728
Aug 2402:06:24 zzyh1 dhcpd: DHCPREQUEST for 192.168.188.100 (192.168.188.15) from00:0c:29:9c:6d:9a (zzyh) via eno16777728
Aug 2402:06:24 zzyh1 dhcpd: DHCPACK on 192.168.188.100 to 00:0c:29:9c:6d:9a (zzyh)via eno16777728
总结：