Railway•17mo ago

Failing healthchecks

My healthchecks are failing and I can't quite figure out why. They work locally and there is no errors in the logs, the service appears to start properly.

Solution:

I've specified the host as 0.0.0.0 now

Jump to solution

32 Replies

Percy•17mo ago

Project ID: fd3c34f8-2314-4d8d-8f79-2ed37386c50d

FaeyOP•17mo ago

fd3c34f8-2314-4d8d-8f79-2ed37386c50d

Brody•17mo ago

what's your healthcheck set to?

FaeyOP•17mo ago

"/health"

Brody•17mo ago

can you show me the code that handles that path

FaeyOP•17mo ago

app.get('/health', (_req, res) => {
  if (initialized && featureSwitchesReady) {
    res.status(200).send('Healthy');
  } else {
    res.status(503).send('Starting');
  }
});

app.get('/health', (_req, res) => {
  if (initialized && featureSwitchesReady) {
    res.status(200).send('Healthy');
  } else {
    res.status(503).send('Starting');
  }
});

I have log output for those two variables, I can confirm they are both true The healthcheck is failing with service unavailable, not 503

Brody•17mo ago

looks good so far show me your app.listen code please

FaeyOP•17mo ago

app.listen(process.env['PORT'] ? process.env['PORT'] : 80);

Brody•17mo ago

never seen it done like that before just do process.env.PORT || 8080 I've changed the fallback port to 8080 for when you do local development, it's always best to listen on a non privileged port

FaeyOP•17mo ago

I've modified it to

await app.listen({port:parseInt(process.env['PORT'] || "8080")});

await app.listen({port:parseInt(process.env['PORT'] || "8080")});

to match with fastify's current method signature I'll let you know what the outcome is once the deploy is finished building

Brody•17mo ago

any reason you choose to go against what I said and use ['PORT'] instead of .PORT?

FaeyOP•17mo ago

Oh I missed that part Should be equivalent though

Brody•17mo ago

I wouldn't know, I'm not a js dev

FaeyOP•17mo ago

Just to make sure, I've modified it to match the suggested signature

await app.listen({port:parseInt(process.env.PORT || "8080")});

await app.listen({port:parseInt(process.env.PORT || "8080")});

Brody•17mo ago

looks good

FaeyOP•17mo ago

Still the same, service unavailable

Brody•17mo ago

remove the healthcheck and see what happens, once it redoploys wait a good 60 seconds before hitting the railway domain

FaeyOP•17mo ago

I've figured it out

Brody•17mo ago

do tell

FaeyOP•17mo ago

Seems like the default behaviour changed since my last deploy, without specifying the host as 0.0.0.0 it will listen to localhost only

Brody•17mo ago

that should not be a problem what so ever for fastify localhost means listen on both ipv4 and ipv6 interfaces

Brody•17mo ago

FaeyOP•17mo ago

That will make it listen to 127.0.0.1 and ::1

Brody•17mo ago

according to that chart, that shouldn't be a problem but I guess that's just node for you

FaeyOP•17mo ago

There is some docker shenanigans here too

Brody•17mo ago

but healthchecks work?

Solution

Faey•17mo ago

I've specified the host as 0.0.0.0 now

FaeyOP•17mo ago

Which restored everything

Brody•17mo ago

do you think it would be worthwhile for me to pr another code snippet for fastify to https://docs.railway.app/troubleshoot/fixing-common-errors

FaeyOP•17mo ago

I think it might be worthwhile if only for the odd syntax that fastify uses

Brody•17mo ago

noted have a nice day/night!

FaeyOP•17mo ago

You too! Thanks for the help

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Failing healthchecks