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genseek_32178's avatar
genseek_32178
Icon for Nimbostratus rankNimbostratus
Nov 28, 2012

Service Check Monitors

Hi Experts,

 

Say if a monitor monitor_http is defined to check port 80 is running on the pool http_pool, and if the monitor is associated with the http_pool, how does bigip check the status of port 80 on the pool members?

 

Does it do telnet to the port 80 at every set interval? or how?

 

thanks-gseek

 

 

 

basic
getting started
new to f5

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  • nathe's avatar
    nathe
    Icon for Cirrocumulus rankCirrocumulus
    Nov 28, 2012
    genseek,

     

     

    If it's a http monitor type then it'll do a tcp 3 way handshake on the port and then send a http request using the configured send string. I think the default is just a plain Get request. As long as the F5 receives something back then the pool member is considered Up. You can, of course, set a Receive String to determine what it should expect and assign the member up or down accordingly. The interval is also specified in the monitor settings.

     

     

    As Steve mentions, it'll work differently depending on monitor type.

     

     

    HTH,

     

    N

     

     

  • genseek_32178's avatar
    genseek_32178
    Icon for Nimbostratus rankNimbostratus
    Nov 28, 2012
    thanks for the response Steve, and Nathan for clarity on http monitor. In case of tcp/udp, how it would work?
  • nathe's avatar
    nathe
    Icon for Cirrocumulus rankCirrocumulus
    Nov 28, 2012
    Here's a link to give you all the details you need, it's for v10 but still relevant:

     

     

    http://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/ltm_configuration_guide_10_1/ltm_appendixa_monitor_types.html1172375

     

     

    Rgds,

     

    N