Forum Discussion

symtex_22198's avatar
symtex_22198
Icon for Nimbostratus rankNimbostratus
Jun 28, 2012

active 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.

 

config
design
  • nitass's avatar
    nitass
    Icon for Employee rankEmployee
    Jun 28, 2012
    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.
  • giltjr's avatar
    giltjr
    Icon for Nimbostratus rankNimbostratus
    Jun 28, 2012
    You 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?
  • nitass's avatar
    nitass
    Icon for Employee rankEmployee
    Jun 29, 2012
    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. oh thanks!, i missed it.
  • nitass's avatar
    nitass
    Icon for Employee rankEmployee
    Jun 29, 2012
    for 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