Railway•3mo ago

Docker based application cannot be redeployed successfully (502 Gateway Error)

Hello everybody, Since a month we have a issue with one specific service within our production environment. After the first request the deployed instance crashes. The instance is "just" a Java (Spring) application living inside a Docker container. The codebase as the corresponding Dockerfile didn't changed.

FROM maven:3-amazoncorretto-21 AS build
COPY . /home/app
RUN mvn -f /home/app/pom.xml clean package

FROM amazoncorretto:21
COPY --from=build /home/app/bot/target/bot-1.0.0-SNAPSHOT.jar /usr/local/lib/stage.jar
EXPOSE 8080
ENTRYPOINT ["java","-jar","/usr/local/lib/stage.jar", "--spring.profiles.active=prod"]

FROM maven:3-amazoncorretto-21 AS build
COPY . /home/app
RUN mvn -f /home/app/pom.xml clean package

FROM amazoncorretto:21
COPY --from=build /home/app/bot/target/bot-1.0.0-SNAPSHOT.jar /usr/local/lib/stage.jar
EXPOSE 8080
ENTRYPOINT ["java","-jar","/usr/local/lib/stage.jar", "--spring.profiles.active=prod"]

The railway.json file:

{
  "$schema": "https://railway.app/railway.schema.json",
  "build": {
    "builder": "DOCKERFILE"
  }
}

{
  "$schema": "https://railway.app/railway.schema.json",
  "build": {
    "builder": "DOCKERFILE"
  }
}

15 Replies

Percy•3mo ago

Project ID: a2d3c3f9-f5e5-4456-bb12-a749673c197d

Patrick PielOP•3mo ago

a2d3c3f9-f5e5-4456-bb12-a749673c197d

Brody•3mo ago

have you pointed the domain to the correct port?

Patrick PielOP•3mo ago

Yes, we changed nothing.

Brody•3mo ago

please send the domain in question

Patrick PielOP•3mo ago

vectorsphere-backend-production.up.railway.app

Brody•3mo ago

application failed to respond means your application failed to respond. please check that you are listening on the host 0.0.0.0 and your domain is pointing to the correct port.

Patrick PielOP•3mo ago

We checked. Nothing changed in the configuration. The application listens to 0.0.0.0 and points to :8080. Also the instance crashes without any error in the Observability log.

Brody•3mo ago

if it's crashing without any logs that means your application is not logging anything

Patrick PielOP•3mo ago

It should 😄 And it has before^^ Was there any changes to how docker builds are treated?

Brody•3mo ago

there has not been, this would be an application level issue, as long as your application prints logs unbuffered to stdout / stderr you will see them in the deploys logs

Patrick PielOP•3mo ago

Yes, that was the case two weeks ago. It is even possible to run the docker container locally. Could there be something else that we miss in the railway configuration?

Brody•3mo ago

yes that possible, I would focus on adding more verbose logging so you can find out why your application is crashing

Patrick PielOP•3mo ago

Okay, we will try our best^^ Thank you anyway 🙂

Brody•3mo ago

sorry i couldn't give you the answer, but railway doesn’t have any more observability into what your code does or doesn’t do than you would.

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Docker based application cannot be redeployed successfully (502 Gateway Error)