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Brian_10532's avatar
Brian_10532
Icon for Altocumulus rankAltocumulus
Apr 10, 2017

Why doesn't GTM poolmember monitor alert show where probe came from?

Most monitor alerts include the IP address of the device that performed the probing. In the example below you can see that GTM delegated to the prober at 52.40.245.229, and it reported back with a failure.

 

Apr 9 00:55:46 10.5.32.15 Apr 9 00:55:46 denbip2000gtm01 alert gtmd[14902]: 011a4003:1: SNMP_TRAP: Pool /Common/my.example.net member my_example_net_https_vs (ip:port=1.2.3.4:443) state change green --> red ( Monitor /Common/https_ecomdb_keepalive from 52.40.245.229 : connect: protocol mismatch search result false) host = 10.5.32.15 source = udp:514 sourcetype = syslog

 

But in some monitor alerts the probe source is not shown. Notice in the example below it only shows "from gtmd". Does anyone know what that means?

 

Apr 6 07:50:31 10.34.32.15 Apr 6 07:50:31 thwbip2000gtm01 alert gtmd[14695]: 011a4003:1: SNMP_TRAP: Pool /Common/token.example.com_lgt member token_example_com_lgt (ip:port=5.6.7.8:443) state change green --> red ( Monitor /Common/token_https from gtmd : state: timeout) host = 10.34.32.15 source = udp:514 sourcetype = syslog

 

application delivery
BIG-IP DNS

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  • Kevin_Davies_40's avatar
    Kevin_Davies_40
    Icon for Nacreous rankNacreous
    Apr 11, 2017

    GTM delegates monitoring where possible. If the server is a BIGIP it will defer to the monitoring provided by the LTM. When server is not it will delegate its monitoring to a BIGIP in the same data center. When GTM is initially setup, big3d software is installed to each BIGIP. GTM sends out monitoring requests to that software which then monitors non BIGIP servers on its behalf. If this is not available then finally GTM will do the monitoring itself. I suspect thats what you are seeing in the logs is monitor requests coming from GTM.

     

    • Brian_10532's avatar
      Brian_10532
      Icon for Altocumulus rankAltocumulus
      Apr 11, 2017

      Is there any way to figure out which GTM did the monitoring? We have 4, so it is kind of ambiguous to just say GTM.