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BalanceNG V3: IPv6 SLB (Server Load-Balancing) multiple legged with VRRP tracking
The BalanceNG agent "bngagent" needs to be started on both target servers before as follows:
This example has been implemented and tested on the TKLB
(Thomas-Krenn Load-Balancer) OEM hardware with automated OEM licensing.
The VRRP tracking as shown initiates a failover if the current VRRP master suffers by at least one of the following conditions:
-
The eth2 link drops (being the connection to the target servers)
-
The eth3 link drops (being the connection to the access network)
-
The gateway appears to be down.
The VRRP connection is implemented redundantly to avoid a "split brain" condition (dual mastership) in case
of NIC failure. VRRP advertisements are sent (and received) on the networks connected to interfaces eth1 and eth3 (eth1-eth1 being a simple crossover cable).
Testing is possible by directing a usual browser to this URL: http://[2001:db8::2:4]:8080/
The IPv6 configuration is setup in /etc/network/interfaces on the
Debian based target servers as follows:
IPv6 configuration in /etc/network/interfaces on Target 1
iface eth1 inet6 static
address 2001:DB8:ffff::1:1
netmask 48
up ip -6 route add ::/0 via 2001:db8:ffff::2:3 dev eth1
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IPv6 configuration in /etc/network/interfaces on Target 2
iface eth1 inet6 static
address 2001:DB8:ffff::1:2
netmask 48
up ip -6 route add ::/0 via 2001:db8:ffff::2:3 dev eth1
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The LB1 Configuration File
// configuration taken Thu Aug 26 14:41:34 2010
// BalanceNG 3.140 (created 2010/08/26)
hostname LB1
modules vrrp,arp,ping,hc,master,slb,rt
set {
ipforwarding 1
vrrppreempt 1
vrrppreemptts 8
}
interface 1 {
name eth1
}
interface 2 {
name eth2
trackval 10
}
interface 3 {
name eth3
trackval 10
}
register interfaces 1,2,3
enable interfaces 1,2,3
vrrp {
vrid 64
priority 200
network 1
tracking enable
}
network 1 {
addr 10.0.0.0
mask 255.0.0.0
real 10.0.0.1
mask6 48
real6 2001:db8::2:1
virt6 2001:db8::2:3
interfaces 1,3
}
network 2 {
mask6 48
real6 2001:db8:ffff::2:1
virt6 2001:db8:ffff::2:3
interface 2
}
register networks 1,2
enable networks 1,2
gateway {
ipaddr6 2001:db8::2:10
ping6 3,10
trackval 10
}
server 1 {
ipaddr6 2001:db8::2:4
port 8080
protocol tcp
sessionid src+port
method session
targets 1,2
}
register server 1
enable server 1
target 1 {
ipaddr6 2001:db8:ffff::1:1
port 80
protocol tcp
ping6 3,10
agent6 10000,3,10
sessionid dst+port
}
target 2 {
ipaddr6 2001:db8:ffff::1:2
port 80
protocol tcp
ping6 3,10
agent6 10000,3,10
sessionid dst+port
}
register targets 1,2
enable targets 1,2
// end of configuration
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The LB2 Configuration File
// configuration taken Thu Aug 26 14:50:06 2010
// BalanceNG 3.140 (created 2010/08/26)
hostname LB2
modules vrrp,arp,ping,hc,master,slb,rt
set {
ipforwarding 1
vrrppreempt 1
vrrppreemptts 8
}
interface 1 {
name eth1
}
interface 2 {
name eth2
trackval 10
}
interface 3 {
name eth3
trackval 10
}
register interfaces 1,2,3
enable interfaces 1,2,3
vrrp {
vrid 64
priority 200
network 1
tracking enable
}
network 1 {
addr 10.0.0.0
mask 255.0.0.0
real 10.0.0.2
mask6 48
real6 2001:db8::2:2
virt6 2001:db8::2:3
interfaces 1,3
}
network 2 {
mask6 48
real6 2001:db8:ffff::2:2
virt6 2001:db8:ffff::2:3
interface 2
}
register networks 1,2
enable networks 1,2
gateway {
ipaddr6 2001:db8::2:10
ping6 3,10
trackval 10
}
server 1 {
ipaddr6 2001:db8::2:4
port 8080
protocol tcp
sessionid src+port
method session
targets 1,2
}
register server 1
enable server 1
target 1 {
ipaddr6 2001:db8:ffff::1:1
port 80
protocol tcp
ping6 3,10
agent6 10000,3,10
sessionid dst+port
}
target 2 {
ipaddr6 2001:db8:ffff::1:2
port 80
protocol tcp
ping6 3,10
agent6 10000,3,10
sessionid dst+port
}
register targets 1,2
enable targets 1,2
// end of configuration
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Please contact us in case of any questions, errors or suggestions
at info@inlab.de.
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