最簡單的DHCP服務,簡單DHCP服務
這幾天在準備網路安裝linux作業系統。最後決定用pxe + kickstart 的方式完成。原理、方案弄完了之後,開始搭建,結果被DHCP給擋住了。這不就得研究研究最簡單最實用的DHCP使用方法。
* 紅色的是必須有
* 綠色的是要注意
* 藍色的是包安裝時,要有的程式包
1. DHCP的實現
2. 設定檔執行個體
執行個體1
執行個體2
-----------------------------------------------------------------
1. DHCP的實現
DHCP服務必須給本網段提供一個位址集區。
# 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; 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; }
一台主機有多塊網卡,需要在某個網卡上啟用DHCP服務時,需要配置如下:
# vi /etc/sysconfig/dhcpd # Command line options here DHCPDARGS="eth0"
------------------------------
2. 設定檔執行個體
簡單的範例:(紅色部分必須有)
# 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 { }
-----------------------------------------------------------------
* 注意:
● 如果主機網卡比較多,可以選擇一塊作為服務網卡。
vi /etc/sysconfig/dhcpd
# Command line options here
DHCPDARGS="em1:1"
● 提供服務的網卡必需是 非自動擷取 的地址。
ifconfig eth0 172.16.40.129/25 up
● 服務提供的位址集區必需包含本地提供服務的地址在裡面。
● 位址集區(range)不能與範圍(subnet)衝突。
● 其他的參數、選項沒有也可以啟動的。所以可以不設定,因為這裡是為了網路安裝。
● 如果配置了這裡所說的最簡單的 dhcp 服務,卻無法啟動。就剩下一個原因,每句後面有沒有分號。