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munish_64882's avatar
munish_64882
Icon for Nimbostratus rankNimbostratus
Aug 17, 2012

Pool not working

I am facing an issues with the pool members.

 

I have two pool members listening on port 80

 

1. 192.168.2.36 and

 

2. 192.168.2.37

 

 

When pool member 192.168.2.36 was down, I was not able to access the website even when 192.168.2.37 was up. But as soon as 192.168.2.36 came up, the website was accessible.

 

 

If I see the pool statictics on my load balancer, it shows ZERO out packets/bits for 192.168.2.37.

 

 

Please refere to attachment for statistics.

 

 

I don't think that there is any issue in the configuration and if one server works, other should also work.

 

 

I have configured it as round robin.

 

 

Any ideas, why isn't it working.

 

 

  • Hi Munish,

     

     

    That sounds odd. Was the 192.168.2.37 member marked down by a monitor? Do you have persistence configured and was the 192.168.2.36 member not marked down by a monitor?

     

     

    Aaron
  • the more wierd thing is that 192.168.2.37 is also up and green. Still Its not passing traffic.

     

    I see 6.0 M in packets but 0 out packets.
  • can you post the virtual server and pool configuration?

     

     

    b virtual (name) list

     

    b pool (name) list
  • Here are the outputs..

     

     

    [root@ULFINPG-LB001:Active] config b virtual list

     

    virtual WEB_VS {

     

    pool WEB_POOL

     

    destination 192.168.2.6:http

     

    ip protocol tcp

     

    }

     

     

     

    [root@ULFINPG-LB001:Active] config b pool list

     

    pool WEB_POOL {

     

    monitor all http

     

    members {

     

    192.168.2.36:http {}

     

    192.168.2.37:http {}

     

    }

     

    }

     

  • can you try to enable "snat automap" under the WEB_VS virtual?
  • what will SNAT achive at this point?

     

    It will NAT the traffic behind VIP... If this would have been the issue, other pool memeber should not have worked..

     

     

    Anyways.. I can give it a try... I will post the update.
  • do both servers use same default gateway? i suspect they might use different gateway.
  • probably yes.. I cannot be sure as I am not managing these web servers.

     

     

    But does default gateway comes in picture?

     

     

    May be I m confused between IN packets and OUT packets when we see statistics?
  • But does default gateway comes in picture?i guess it does not work since server responds directly to client i.e. client -> bigip -> server (192.168.2.37) -> client.

     

     

    May be I m confused between IN packets and OUT packets when we see statistics?have you seen this one?

     

     

    sol9077: Overview of BIG-IP traffic flow

     

    http://support.f5.com/kb/en-us/solutions/public/9000/000/sol9077.html

     

     

    hope this helps.