Отказоустойчивый сервис DHCP

[root@server1 ~]# yum install -y dhcp && ssh server2 yum install -y dhcp
[root@server1 /]# chkconfig --level 345 dhcpd on && ssh server2 chkconfig --level 345 dhcpd on

Если нужно указать на каком интерфейсе будет раздавать адреса DHCP серверер
vi /etc/sysconfig/dhcpd
DHCPDARGS=eth0 


[root@server1 dhcp]# cp /etc/dhcp/dhcpd.conf /etc/dhcp/dhcpd.conf.orig  && ssh server2 cp /etc/dhcp/dhcpd.conf /etc/dhcp/dhcpd.conf.orig


[root@server1 dhcp]# vi /etc/dhcp/dhcpd.general

ddns-update-style none;

log-facility local7;

subnet 192.168.1.0 netmask 255.255.255.0 {
  pool {
    failover peer "dhcp";
    range 192.168.1.128 192.168.1.228;
  }
  option routers 192.168.1.254;
  option domain-name "corpX.un";
  option domain-name-servers 192.168.1.1, 192.168.1.2;
  default-lease-time 600;
  max-lease-time 7200;
}



[root@server1 dhcp]# scp /etc/dhcp/dhcpd.general server2:/etc/dhcp/dhcpd.general


[root@server1 dhcp]# vi /etc/dhcp/dhcpd.conf

failover peer "dhcp" {
  primary;
  address 192.168.1.21;
  port 519;
  peer address 192.168.1.22;
  peer port 520;
  max-response-delay 60;
  max-unacked-updates 10;
  mclt 600;
  split 128;
  load balance max seconds 3;
}

include "/etc/dhcp/dhcpd.general";




[root@server1 dhcp]# ssh server2

[root@server2 /]# vi /etc/dhcp/dhcpd.conf

failover peer "dhcp" {
  secondary;
  address 192.168.1.22;
  port 520;
  peer address 192.168.1.21;
  peer port 519;
  max-response-delay 60;
  max-unacked-updates 10;
}

include "/etc/dhcp/dhcpd.general";


ctrl + D


[root@server1 /]# service dhcpd restart && ssh server2 service dhcpd restart



# less /var/log/messages
# less /var/lib/dhcpd/dhcpd.leases


Подавление посторонних DHCP серверов

http://wiki.val.bmstu.ru/doku.php?id=%D1%81%D0%B5%D1%80%D0%B2%D0%B8%D1%81_dhcp#%D0%BF%D1%80%D0%BE%D0%B2%D0%B5%D1%80%D0%BA%D0%B0_%D0%BA%D0%BE%D0%BD%D1%84%D0%B8%D0%B3%D1%83%D1%80%D0%B0%D1%86%D0%B8%D0%B8_%D0%B8_%D0%B7%D0%B0%D0%BF%D1%83%D1%81%D0%BA