How to set up health checks for non-service processes?

1

I’m trying to set up health checks for non-public services. My understanding is that this is the intended purpose of custom checks. Taken straight from the docs:

If your app doesn’t have public-facing services, or you want independent health checks that don’t affect request routing, use this top-level checks section instead of [[services.checks]].

Yet I can’t seem to get this to work?

I’ve included a toml below, which illustrates my attempt. I have two processes, foo (public http service) and bar (private internal service). The foo check works as expected, but the bar check does not.

[processes]
foo = "./foo" # this is public and serves on 8000
bar = "./bar" # this is private and serves on 9000

# set up `foo` as an http service to make it public, and give it an http check
# this works
[http_service]
internal_port = 8000
processes = ["foo"]
[[http_service.checks]]
grace_period = "20s"
interval = "5s"
timeout = "5s"
method = "GET"
path = "/health"

# set up an http check for bar?
# this does not work
[checks]
[checks.bar_health]
type = "http"
grace_period = "20s"
interval = "5s"
timeout = "5s"
method = "GET"
path = "/health"
port = 9000

It appears that the custom check above still tries to check the foo machine (causing deployment failure), but I want it only to check the bar machine.

Do I have a fundamental misunderstanding of custom checks? What’s the correct way of setting this up?

2

Hi… I think you just need a processes = ["bar"] line, then. From the documentation section that you linked to (although it’s not really emphasized there):

processes: For apps with multiple processes. The process group to apply the health checks to.

Hope this helps!

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