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DHCP services can be set up to be highly available across two servers. The servers in the example below are 10.10.0.10 and 10.10.0.11. It requires two files: /etc/dhcpd.conf and /etc/dhcpd.master. The dhcpd.conf file must be modified for each peer, the dhcpd.master is identical for both servers.
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| title | dhcpd.conf 10.10.0.10 | borderStyle | solid |
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# Global Options
option domain-name "example.com";
option domain-name-servers 10.10.0.10,10.10.0.11;
option tftp-server-name "10.10.0.10";
option time-servers 10.10.0.10,10.10.0.11;
option ntp-servers 10.10.0.10,10.10.0.11;
option time-offset -25200;
default-lease-time 86400;
ddns-update-style interim;
max-lease-time 86400;
authoritative;
ddns-update-style none;
option sip-servers-name code 120 = text;
failover peer "dhcp" {
primary;
address 10.10.0.10;
port 520;
peer address 10.10.0.11;
peer port 521;
max-response-delay 60;
max-unacked-updates 10;
mclt 600;
split 128;
load balance max seconds 3;
}
include "/etc/dhcpd.master";
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| title | dhcpd.conf 10.10.0.11 | borderStyle | solid |
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# Global Options
option domain-name "example.com";
option domain-name-servers 10.10.0.10,10.10.0.11;
option tftp-server-name "10.10.0.10";
option time-servers 10.10.0.10,10.10.0.11;
option ntp-servers 10.10.0.10,10.10.0.11;
option time-offset -25200;
default-lease-time 86400;
ddns-update-style interim;
max-lease-time 86400;
authoritative;
ddns-update-style none;
option sip-servers-name code 120 = text;
failover peer "dhcp" {
secondary;
address 10.10.0.11;
port 521;
peer address 10.10.0.10;
peer port 520;
max-response-delay 60;
max-unacked-updates 10;
load balance max seconds 3;
}
include "/etc/dhcpd.master";
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| title | dhcpd.master both servers | borderStyle | solid |
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# Global Options
option domain-name "example.com";
option domain-name-servers 10.10.0.10,10.10.0.11;
option tftp-server-name "10.10.0.10";
option time-servers 10.10.0.10,10.10.0.11;
option ntp-servers 10.10.0.10,10.10.0.11;
option time-offset -25200;
default-lease-time 86400;
ddns-update-style interim;
max-lease-time 86400;
authoritative;
ddns-update-style none;
option sip-servers-name code 120 = text;
subnet 10.10.0.10 netmask 255.255.255.0 {
}
# eth1 - SALES
#
subnet 10.10.1.0 netmask 255.255.255.0 {
pool {
failover peer "dhcp";
range 10.10.1.2 10.10.1.254;
deny dynamic bootp clients;
default-lease-time 43200;
max-lease-time 43200;
option routers 10.10.1.1;
option subnet-mask 255.255.255.0;
option domain-name "example.com";
option tftp-server-name "10.10.1.10";
option sip-servers-name "sipx1.example.com:12000/cmcprov/login";
option domain-name-servers 10.10.0.10;
option ntp-servers 10.10.0.10;
group {
next-server sipx1.example.com; # TFTP serve
host information_systems_fxs_1 {
hardware ethernet 00:00:00:00:00:00;
fixed-address 10.10.1.16;
}
}
}
}
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