Forum Discussion
symtex_22198
Nimbostratus
Nimbostratusactive standby members within a pool???
I would like to have the following layout.
server1=active
server2=backup for server1
server3=active
server4=backup for server3
server5=active
server6j=backup for server5
is this posible via any configuration options or is it necessary to make an irule?
I know about priority groups but it doesn't seem like it would work the way I need it to.
4 Replies
- nitass
Employee
can you try to create reverse health monitor to specific server and assign it to the backup server? for example, creating reverse monitor to server1 and assigning to server2. 
giltjrYou would need to do this via an iRule. Since all members of a pool are looked at for load balancing. Even with a reverse monitor, if 1 goes down new connections could be sent to 2, 3 or 5.
Is there a special reason you want 2 to only backup 1, 4 only to backup 3, and 6 only to backup 5?- nitassSince all members of a pool are looked at for load balancing. Even with a reverse monitor, if 1 goes down new connections could be sent to 2, 3 or 5. oh thanks!, i missed it.
- nitassfor irule, i think you may create 2 pools; one (e.g. pool1) contains server1, server3 and server5 without health monitor but the other one (e.g. pool2) has.
then assign pool1 to virtual server. in LB_SELECTED, check whether selected pool member is marked down in pool2. if so, use node or pool command to direct traffic to its backup server.
LB::server wiki
https://devcentral.f5.com/wiki/iRules.LB__server.ashx
LB::status wiki
https://devcentral.f5.com/wiki/iRules.lb__status.ashx
node wiki
https://devcentral.f5.com/wiki/iRules.node.ashx
pool wiki
https://devcentral.f5.com/wiki/iRules.pool.ashx
