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[GH-ISSUE #2787] Healthcheck preventing a resource from being reachable #4181

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opened 2026-04-20 08:39:29 -05:00 by GiteaMirror · 2 comments
GiteaMirror commented 2026-04-20 08:39:29 -05:00
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Originally created by @svillar on GitHub (Apr 4, 2026).
Original GitHub issue: https://github.com/fosrl/pangolin/issues/2787

Describe the Bug

I had a healthcheck for a publicly accessible resource. It pointed to an url:port that was no longer accessible, I think at some point the check was correct but then I must have changed some deployments. The thing is that the service was not accessible because that healthcheck was wrong (newt was complaining about it, that's how I found that it was the issue).

Disabling the healthcheck made the resource available again.

My point is that a healthcheck, which is basically meant to get notified about potential issues, should not block access to the actual resources if they're available.

Environment

  • OS Type & Version: (e.g., Ubuntu 22.04)
  • Pangolin Version: 1.16
  • Gerbil Version:
  • Traefik Version:
  • Newt Version: 1.9
  • Olm Version: (if applicable)

To Reproduce

Setup a publicly accessible resource with a wrong healthcheck test

Expected Behavior

The service is still accessible from the outside

Originally created by @svillar on GitHub (Apr 4, 2026). Original GitHub issue: https://github.com/fosrl/pangolin/issues/2787 ### Describe the Bug I had a healthcheck for a publicly accessible resource. It pointed to an url:port that was no longer accessible, I *think* at some point the check was correct but then I must have changed some deployments. The thing is that the service was not accessible because that healthcheck was wrong (newt was complaining about it, that's how I found that it was the issue). Disabling the healthcheck made the resource available again. My point is that a healthcheck, which is basically meant to get notified about potential issues, should not block access to the actual resources if they're available. ### Environment - OS Type & Version: (e.g., Ubuntu 22.04) - Pangolin Version: 1.16 - Gerbil Version: - Traefik Version: - Newt Version: 1.9 - Olm Version: (if applicable) ### To Reproduce Setup a publicly accessible resource with a wrong healthcheck test ### Expected Behavior The service is still accessible from the outside
GiteaMirror commented 2026-04-20 08:39:31 -05:00
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@oschwartz10612 commented on GitHub (Apr 4, 2026):

Hey, thanks for the thought! This is actually expected behavior. When a
health check fails the target gets taken out of rotation so other
targets if available can serve the resource or so the user sees a "no
server available" which is the expected error message in this case.

This is normal LB behavior. AWS for example:
https://docs.aws.amazon.com/elasticloadbalancing/latest/application/target-group-health-checks.html#target-health-states:~:text=Each%20load%20balancer%20node%20routes%20requests%20only%20to%20the%20healthy%20targets%20in%20the%20enabled%20Availability%20Zones%20for%20the%20load%20balancer.

<!-- gh-comment-id:4187193757 --> @oschwartz10612 commented on GitHub (Apr 4, 2026): Hey, thanks for the thought! This is actually expected behavior. When a health check fails the target gets taken out of rotation so other targets if available can serve the resource or so the user sees a "no server available" which is the expected error message in this case. This is normal LB behavior. AWS for example: https://docs.aws.amazon.com/elasticloadbalancing/latest/application/target-group-health-checks.html#target-health-states:~:text=Each%20load%20balancer%20node%20routes%20requests%20only%20to%20the%20healthy%20targets%20in%20the%20enabled%20Availability%20Zones%20for%20the%20load%20balancer.
GiteaMirror commented 2026-04-20 08:39:32 -05:00
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@svillar commented on GitHub (Apr 7, 2026):

Ok, a misinterpretation from my side of what the healthcheck means. Your explanation makes a lot of sense. Thanks for the great work folks!

<!-- gh-comment-id:4197046234 --> @svillar commented on GitHub (Apr 7, 2026): Ok, a misinterpretation from my side of what the healthcheck means. Your explanation makes a lot of sense. Thanks for the great work folks!
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Reference: github-starred/pangolin#4181
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