We will look for and use a Dockerfile at the service's root if it exists.

Railway notifies you when it's using the Dockerfile in the build process with the following message in the logs

If you have a Dockerfile in your project directory, you can use railway run with no arguments to build and run your Dockerfile.

Custom Dockerfile

If you want to use a custom Dockerfile named something other than Dockerfile, you can use the RAILWAY_DOCKERFILE_PATH environment variable to specify the path to the file.

For example, if your Dockerfile was called Dockerfile.origin, you'd specify it like this.

Environment Variables

If you need to use the environment variables that Railway injects at build time, you must specify them in the Dockerfile with

Be sure to declare your environment variables at the start of the Dockerfile.

Docker Compose

Railway doesn't support docker compose at the moment.

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