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Hungpm's avatar
Hungpm
Icon for Nimbostratus rankNimbostratus
Sep 18, 2019

HTTP Monitoring pool some times problem

Dear guys

 

at the moment , i have LTM , make virtual server to pool server (production server ) , i have monitoring pool server http monitor

 

GET /ipc/vi/ HTTP/1.1\r\nHost: <hostname>\r\nConnection: Close\r\n\r\n

Receive string: HTTP/1.1 200 OK ,

before it well working , but close day F5 alter pool down about 1 minute

 

Pool /Common/serverweb_80_pool member /Common/10.0.41.9:7727 monitor status down. [ /Common/Monitor_serverweb: down; last error: /Common/Monitor_serverweb: Response Code: 200 (OK) @2019/09/18 05:16:46. ] [ was up for 23hrs:58mins:29sec ]

 

pls help me check it

many thanks

BIG-IP
LTM
security
  • youssef1's avatar
    youssef1
    Icon for Cumulonimbus rankCumulonimbus
    Sep 18, 2019

    Hi

     

    can you tell me configuration that you set in your monitor:

     

    Interval: ?

    timeout: ?

     

    regards

  • Hungpm's avatar
    Hungpm
    Icon for Nimbostratus rankNimbostratus
    Sep 18, 2019

    Thanks for your see and reply .

     

    Interval 5 seconds

    timeout 16 seconds

     

    thanks

  • youssef1's avatar
    youssef1
    Icon for Cumulonimbus rankCumulonimbus
    Sep 18, 2019

    In this case maybe the problem come from your application who do not respond correctly to the monitor's request during a lapse of time.

    In order to validate this possibility you can enable "Monitor Logging":

     

    https://support.f5.com/csp/article/K12531

     

    to enable monitoring logging go in the pool then click on the poolmemeber, you will then have the possibility to activate this feature.

     

    The BIG-IP system generates the following log file for the pool member:

    /var/log/monitors/....

     

    you could check the logs and see why your Backend server was down. by controlling the response of the server ...

     

    keep me in touch if you need more details.

     

    regards,