Install and use dhcp server in Ubuntu 12.04

Simple DHCP server

When creating an HDFS cluster, I deeply feel that it is inconvenient to add the configuration in/etc/hosts. inconsistency may cause errors and heavy workload.

It is also convenient to create a dhcp server in the LAN. Official documents: https://help.ubuntu.com/community/isc-dhcp-server

First, create a KVM virtual machine. The OS is Ubuntu 12.04.

Then install the dhcp3 server

apt-get install isc-dhcp-server

Edit the/etc/default/isc-dhcp-server File

Enter eth0

INTERFACES="eth0"

Edit the file:/etc/dhcp/dhcpd. conf

Modify the original example.org settings:

# option definitions common to all supported networks...                                                                                          option domain-name "hadoop.cn";option domain-name-servers dhcp.hadoop.cn, namenode1.hadoop.cn, namenode2.hadoop.cn, datanode1.hadoop.cn, datanode2.hadoop.cn, datanode3.hadoop.cn, datanode4.had\oop.cn, datanode5.hadoop.cn, datanode6.hadoop.cn;

Added lease period:

default-lease-time 6000;                                                                                                                          max-lease-time 72000;

Add the following Configuration:

option routers 192.168.1.1;subnet 192.168.1.0 netmask 255.255.255.0 {       range 192.168.1.10 192.168.1.100;       option domain-name-servers 192.168.1.1;       option broadcast-address 192.168.1.255;}

Including the router address, IP address range, DNS server IP address, and broadcast IP address.

Service command:

service isc-dhcp-server start

Note that the IP address used by dhcp must be in the same CIDR block as eth0. Otherwise, the startup will fail.

Create Based on Virutal IP

Because I actually want to assign an IP address using DHCP in another network segment, create a new virtual IP address in the/etc/network/interfaces file:

Eth0: 1 is not required.

# The primary network interfaceauto eth0iface eth0 inet static        address 192.168.1.111        netmask 255.255.255.0        network 192.168.1.0        broadcast 192.168.1.255        gateway 192.168.1.1        # dns-* options are implemented by the resolvconf package, if installed        dns-nameservers 8.8.8.8        dns-search defaultdomainiface eth0 inet staticaddress 192.168.4.1netmask 255.255.255.0

Then in/etc/default/isc-dhcp-server

INTERFACES="eth0"

Replace all 192.168.1.X in dhcpd. conf with 192.168.4.X. Restarted successfully!