Forum Discussion
Les_Marstaeller
Nimbostratus
NimbostratusWho to tell which server is being selected by an irule
Hi,
I am using the iRule below to control server pool failover when a pool member goes down:
-------------------------------------------------------------------------
rule http_sticky_failover {
when RULE_INIT {
set ::active_HTTP 192.168.222.61
set ::backup_HTTP 192.168.222.62
}
when CLIENT_ACCEPTED {
pool WS_pool member $::active_HTTP 80
}
when LB_FAILED {
if { [LB::status pool WS_pool member $::backup_HTTP 80] eq "up" } {
set temp $::active_HTTP
set ::active_HTTP $::backup_HTTP
set ::backup_HTTP $temp
pool WS_pool member $::active_HTTP 80
}
}
}
--------------------------------------------------------------------------
Is there any way to tell which pool member is currently the active one?
Also, Is there any way to change which pool member is active, apart from causing a server to go down?
As always, thanks for help you can give me.
Les
Canberra, Australia.
- JRahm
Admin
Yep. From the iRules wiki:
Description
This command allows you to query for information about the mbmber selected after a load balancing decision has been made.
Syntax
LB::server
LB::server addr
LB::server name
LB::server pool
LB::server port
LB::server priority
LB::server ratio
LB::server weight
LB::server ripeness
LB::server
Returns the currently selected pool
LB::server addr
Returns the IP address of the currently selected pool member
LB::server name
Returns the hostname of the currently selected pool member
LB::server pool
Returns the pool of the currently selected member
LB::server port
Returns the port of the currently selected pool member
LB::server priority
Returns the priority of the currently selected pool member
LB::server ratio
Returns the ratio value of the currently selected pool member
LB::server weight
Returns the weighting of the currently selected pool member
LB::server ripeness
Returns the ripeness information of the currently selected pool member - A link to the LB::server command that citizen_elah was good enough to point out above: Click here
Colin 
Les_MarstaellerThanks for your help (yet again citizen_elah).
Can I just type these at the command line or do they have to be in an irule?
Thanks, bye,
Les- Those are iRule commands, so they need to be included in a rule.
Colin - Les_MarstaellerThanks Colin.
Appreciated,
Les - JRahmLes, to see your active connections from the cli, use the b conn command:
b conn 10.1.1.88
10.1.1.88:1706 <-> 10.100.1.24:3389 <-> 10.220.110.23:3389 tcp
b conn 10.1.1.88 show all
VIRTUAL 10.100.1.24:3389 <-> NODE 10.220.110.23:3389
CLIENTSIDE 10.1.1.88:1706 <-> 10.100.1.24:3389
(pkts,bits) in = (1, 528), out = (0, 0)
SERVERSIDE 10.100.3.24:1706 <-> 10.220.110.23:3389
(pkts,bits) in = (0, 0), out = (1, 496)
PROTOCOL tcp UNIT 1 IDLE 69 (230400) LASTHOP 100 00:d0:01:b1:ff:fc
