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mlwebster's avatar
mlwebster
Icon for Cirrus rankCirrus
Sep 22, 2022

Health Monitor

Hi comminity,
I have a puzzling health monitor that I can't get working.
I can curl to the server from CLI 

# curl server-name.domain:1936/healthz -k
ok

But when I try to produce a health monitor via the GUI to do the same/similar I get no valid response and the pool is marked down.
This is an OpenShift server that doesn't respond to a request on 1936 so I need to craft some form of https command to mimic the above.

If I point directly at https I get the folloiwng error:

# curl https://server-name.domain/healthz -k
returns curl: (35) Unknown SSL protocol error in connection to server-name.domain:443

Has anyone seen similar issues when monitoring OpenShift pools and got a working solution / suggestion?
I need something better than TCP-half-open monitoring.

application delivery
health monitor

3 Replies

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  • CA_Valli's avatar
    CA_Valli
    Icon for MVP rankMVP
    Sep 23, 2022

    You should be looking at SSL configuration in your backend, something like this might return some more info

    (echo -e "GET /healthz HTTP/1.1\r\nHost: \r\nConnection: Close\r\n\r\n";sleep 1) | openssl s_client -connect server-name.domain

     

  • mlwebster's avatar
    mlwebster
    Icon for Cirrus rankCirrus
    Oct 05, 2022

    works well from CLI, I need to play with the monitor in the GUI to see if this works as expected now - fingers crossed 🤞

  • Siona_Somboba's avatar
    Siona_Somboba
    Icon for Nimbostratus rankNimbostratus
    Aug 17, 2023

    from GUI - https monitor send string should only have 

    GET /healthz HTTP/1.1\r\nHost: f5bigip.domain\r\nConnection: Close\r\n\r\n