Follow on post:
To setup a failover DHCPD + LTSP servers plan that Server1 should have
IP of 192.168.0.254 and Server2 192.168.0.253. Setup both servers for
LTSP as usual using these IP's. Now copy the files given below for
Master and Slave servers in place of /etc/dhcpd.conf on both servers
respectively and restart service DHCPD.
Since both servers are connected to same subnet they will answer dhcp
lease requests when any thin client boots up. Whichever server
responds first assigns the lease and the load of client is moved to
that server. Over the period you will find automatic load balancing
works and at the same time automatic fail over will happen when any of
the server goes down.
Both servers run on different ports (519 & 520)
May be Jim can put this in Wiki. I hope there are no typos but watch
out all the same.
--
Regards,
Sudev Barar
Server1 dhcpd.conf file:
###########################################
###DHCP failover and load balancing stuff Master###
###########################################
failover peer "ltsp" {
primary;
address 192.168.0.254;
port 519;
peer address 192.168.0.253;
peer port 520;
mclt 3600;
max-response-delay 30;
max-unacked-updates 10;
load balance max seconds 3;
###Next two lines are important and should be there in master###
hba ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:
00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00;
}
ddns-update-style none;
authoritative;
default-lease-time 21600;
max-lease-time 21600;
option time-offset 19800;
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.0.255;
option routers 192.168.0.254;
option domain-name-servers 192.168.0.254;
option domain-name "ltsp";
option root-path "192.168.0.254:/opt/ltsp/i386";
option option-128 code 128 = string;
option option-129 code 129 = text;
shared-network WORKSTATIONS {
subnet 192.168.0.0 netmask 255.255.255.0 {
use-host-decl-names on;
option log-servers 192.168.0.254;
if substring (option vendor-class-identifier, 0, 9) = "PXEClient"
{
filename "/lts/2.4.26-ltsp-3/pxelinux.0";
}
else
{
filename "/lts/vmlinuz-2.4.26-ltsp-3";
}
pool {
failover peer "ltsp";
default-lease-time 21600;
max-lease-time 21600;
deny dynamic bootp clients;
range 192.168.0.10 192.168.0.99;
}
}
}
Server2 dhcpd.conf file:
###########################################
###DHCP failover and load balancing stuff Slave###
###########################################
failover peer "ltsp" {
secondary;
address 192.168.0.253;
port 520;
peer address 192.168.0.254;
peer port 519;
max-response-delay 30;
max-unacked-updates 10;
load balance max seconds 3;
}
ddns-update-style none;
authoritative;
default-lease-time 21600;
max-lease-time 21600;
option time-offset 19200;
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.0.255;
option routers 192.168.0.253;
option domain-name-servers 192.168.0.253;
option domain-name "ltsp";
option root-path "192.168.0.253:/opt/ltsp/i386";
option option-128 code 128 = string;
option option-129 code 129 = text;
shared-network WORKSTATIONS {
subnet 192.168.0.0 netmask 255.255.255.0 {
use-host-decl-names on;
option log-servers 192.168.0.253;
if substring (option vendor-class-identifier, 0, 9) = "PXEClient"
{
filename "/lts/2.4.26-ltsp-3/pxelinux.0";
}
else
{
filename "/lts/vmlinuz-2.4.26-ltsp-3";
}
pool {
failover peer "ltsp";
default-lease-time 21600;
max-lease-time 21600;
deny dynamic bootp clients;
range 192.168.0.10 192.168.0.99;
}
}
}
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