Настройка отказоустойчивости DHCP сервера.

Основной сервер – 192.168.17.251, а вторичный – 192.168.17.250

Основной:

Декларируем секцию failover /etc/dhcp/dhcpd.conf:

failover peer "dhcp-failover" {

  primary; # declare this to be the primary server

  address 192.168.17.251;

  port 647;

  peer address 192.168.17.250;

  peer port 647;

  max-response-delay 30;

  max-unacked-updates 10;

  load balance max seconds 3;

  mclt 1800;

  split 128;

}

надо размещать перед секцией пула.

Дописывам в секцию пула:

subnet 192.168.17.0 netmask 255.255.255.0 {

  pool {

    # In order to turn off failover just comment out

    # the line below

    failover peer "dhcp-failover";

    range 192.168.17.41 192.168.17.254;

  }

  option subnet-mask 255.255.255.0;

  option broadcast-address 192.168.17.255;

  option routers gw1.OFFICE.LOCAL;

}

Вторичный сервер: /etc/dhcp/dhcpd.conf

failover peer "dhcp-failover" {

  secondary; # declare this to be the secondary server

  address 192.168.17.250;

  port 647;

  peer address 192.168.17.251;

  peer port 647;

  max-response-delay 30;

  max-unacked-updates 10;

  load balance max seconds 3;

}

subnet 192.168.17.0 netmask 255.255.255.0 {

  pool {

    # In order to turn off failover just comment out

    # the line below

    failover peer "dhcp-failover";

    range 192.168.17.50 192.168.17.199;

  }

  option subnet-mask 255.255.255.0;

  option broadcast-address 192.168.17.255;

  option routers gw1.OFFICE.LOCAL;

}

Редактирование динамических DNS зон.

Пауза:

rndc freeze

Редактирование зоны.

Возобновление работы:

rndc thaw