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Railway•3mo ago

502 on app with correct HOST and PORT

Hi, friends! I'm deploying a new app on railway, I've followed the guides without problem. The build was successful, the application is running, but I can't access this, because I'm getting a 502 status code. https://docs.railway.app/guides/fixing-common-errors I've followed this guide but didn't solved my problem. I'm already using the PORT that railway provides and the host is set to 0.0.0.0 Am I missing something?

Railway Docs

Fixing Common Errors | Railway Docs

Documentation for Railway

59 Replies

Percy•3mo ago

Project ID: 75f448f4-88c9-4d82-b428-61740d90e40c

theoOP•3mo ago

75f448f4-88c9-4d82-b428-61740d90e40c My public route is this: niki-backend-homolog.up.railway.app It just works if I specify the app port to 3000 on railway env :/

ThallesComH•3mo ago

hey, send your app.listen. I also use nest and have no problems, pretty weird.

theoOP•3mo ago

await app.listen(process.env.PORT || 3000, '0.0.0.0');

await app.listen(process.env.PORT || 3000, '0.0.0.0');

ThallesComH•3mo ago

I don't even need the 0.0.0.0, maybe you could give it a try? but anyway, the port env would work without any problems.

No description

theoOP•3mo ago

k, imma try removing the 0.0.0.0 but it was not working also still not working when i removed the 0.0.0.0 and port just works when i specify the port :/

ThallesComH•3mo ago

weird, are u using fastify or express?

theoOP•3mo ago

fastify

ThallesComH•3mo ago

hmmm im using express so it might have a difference

theoOP•3mo ago

hmm maybe

ThallesComH•3mo ago

I guess I've an application where I used fastify but anyway the port env should be working alright so I guess there's no need to do something about it

theoOP•3mo ago

i see a question here with the same problem, probably? https://help.railway.app/questions/my-backend-is-launched-without-probleme-9970071f without solution (when I specify the port it works) should I specify this and just move forward? should I have any problem by doing this?

ThallesComH•3mo ago

couldnt find any other issue related to fastify and 502 yep its alright

theoOP•3mo ago

oh, i have another problem the database cannot connect to run migrations without the public url my build command runs the migrations before the build to keep the db up-to-date but it just works when I add an env variable with the public database url

ThallesComH•3mo ago

the private networking isn't available at build unfortunately. in my case I do the migration on the start script

theoOP•3mo ago

hmm is there any problem to use the public url? (just for migrations)

ThallesComH•3mo ago

by using public url you'll be charged more by bandwidth. I don't know how much you would but I'm pretty sure it would be cheap

theoOP•3mo ago

hmm, it is used only at migrations, so I guess there is no problem

ThallesComH•3mo ago

If you're sure of that then ok but tbh I would just move the migration script to the start command

theoOP•3mo ago

you put migrations before start, right? with && operator

ThallesComH•3mo ago

yep, are u using prisma?

theoOP•3mo ago

if migrations fail, you dont start? typeorm

ThallesComH•3mo ago

ah typeorm

theoOP•3mo ago

okay, imma try this approach put it on start script

ThallesComH•3mo ago

yep but my backend contains a healthcheck if yours dont then it would just fail

ThallesComH•3mo ago

but its pretty simple to setup one https://docs.nestjs.com/recipes/terminus#setting-up-a-healthcheck

Documentation | NestJS - A progressive Node.js framework

Documentation | NestJS - A progressive Node.js framework

Nest is a framework for building efficient, scalable Node.js server-side applications. It uses progressive JavaScript, is built with TypeScript and combines elements of OOP (Object Oriented Programming), FP (Functional Programming), and FRP (Functional Reactive Programming).

theoOP•3mo ago

lemme understand in this case, what does the healthcheck change?

ThallesComH•3mo ago

this is my script with prisma:

"start": "prisma generate --no-hints && prisma migrate deploy && node dist/src/main",

"start": "prisma generate --no-hints && prisma migrate deploy && node dist/src/main",

theoOP•3mo ago

i didnt set a healthcheck yet

ThallesComH•3mo ago

Railway will hold the deployment of your application until its actually reachable by doing an HTTP ping to a /health endpoint you've to configure it in the service settings

theoOP•3mo ago

oh, so it will not stop trying to restart until the app is up?

ThallesComH•3mo ago

trying to restart? you mean an infinite loop of fail restart?

theoOP•3mo ago

yup

ThallesComH•3mo ago

nope, thats another setting

No description

theoOP•3mo ago

where should I configure health route?

ThallesComH•3mo ago

No description

ThallesComH•3mo ago

go to your service settings and scroll down until you see that

theoOP•3mo ago

oh good will this be enough?

@Controller('health')
export class HealthController {
  @Get()
  healthCheck() {
    return { ok: true };
  }
}

@Controller('health')
export class HealthController {
  @Get()
  healthCheck() {
    return { ok: true };
  }
}

ThallesComH•3mo ago

yep it should be alright nestjs also offers the option to check your database and other external services but thats optional, that health controller will work https://docs.nestjs.com/recipes/terminus#setting-up-a-healthcheck

theoOP•3mo ago

imma see them later, if my db is down, the routes will be the smaller problem lmao

ThallesComH•3mo ago

makes sense :kekw:

theoOP•3mo ago

ive added the route, but its not working, probably because previous deploy was not with port

ThallesComH•3mo ago

wdym by not working? 502 or build not going through?

theoOP•3mo ago

502 the deploy with the port is not working because the previous one was the health one and the status is 502, because there is no port yet 🤣 removed healthcheck for a while

ThallesComH•3mo ago

no port yet? Railway should just do a load balance so both of the deploys will contain the port

theoOP•3mo ago

the problem was the 0.0.0.0 probably it appears to be needed on fastify apps

ThallesComH•3mo ago

yep, i'll see if I can get my fastify app to see what I did but it just worked 💀

theoOP•3mo ago

gods with u

ThallesComH•3mo ago

yep it just works 💀

theoOP•3mo ago

not using process to env? 😕

ThallesComH•3mo ago

I use https://github.com/t3-oss/t3-env to validate my env variables and then import it elsewhere

theoOP•3mo ago

interesting u use redis in any of your nest apps? deployed on railway

ThallesComH•3mo ago

yes

theoOP•3mo ago

does it worth it?

ThallesComH•3mo ago

you mean in terms of pricing?

theoOP•3mo ago

yes instead of using the instance memory itself

ThallesComH•3mo ago

well Railway's memory pricing is not that cheap but if your just using for cache it should be alright

theoOP•3mo ago

well, health check is now working obrigado amigo late night, imma sleep

ThallesComH•3mo ago

I used to host a bullmq queue with at least 16k per minute inserts and it was pretty cheap IMO great! boa noite!

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