Health check on port 9999

[sarjuymd]

Is there a health check on port 9999, the reverse proxy? Use case is that the AWS ALB target group needs something to mark the fabio service as up. I'm currently using the response of 404 for / as the health check which is far from ideal.
I know I could check one of the routes but they are ephemeral so can't rely on them as an indication that fabio's proxying service is up and running.

[tristanmorgan]

When running a health check on the listener port (default 9999), the response will come from one of the destination services behind Fabio. If you use host based routing then you would need the AWS ALB's to set a host header. Assuming you didn't want to expose the health check to the internet maybe set an allow=ip:10.0.0.0/8 or equivalent.

Can the ALB check a different port to the listener?.. maybe check the admin port instead (default 9998/health).

[sarjuymd]

Thanks. That's what we've ended up doing.

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On Wed, 25 Jun 2025 at 00:50, Tristan Morgan ***@***.***> wrote: *tristanmorgan* left a comment (fabiolb/fabio#995) <#995 (comment)> When running a health check on the listener port (default 9999), the response will come from one of the destination services behind Fabio. If you use host based routing then you would need the AWS ALB's to set a host header. Assuming you didn't want to expose the health check to the internet maybe set an allow=ip:10.0.0.0/8 or equivalent. Can the ALB check a different port to the listener?.. maybe check the admin port instead (default 9998/health). — Reply to this email directly, view it on GitHub <#995 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ADXDUL5WMCW4A2Z4NOGG5R33FHP3VAVCNFSM6AAAAAB7766JJGVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTAMBSGE4DAOJVGA> . You are receiving this because you authored the thread.Message ID: ***@***.***>

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