0288702c-a08b-4f8c-b274-652a6ff81652

Use env substitute command

Create a template file, run this command in your dockerfile (using ARG VARIABLE_NAME to ingest the variables):

envsubst < config.template.json > config.json

Example template file:

  "apiKey": "${API_KEY}",
  "dbPassword": "${DB_PASSWORD}",
  "authToken": "${AUTH_TOKEN}"
}```

or use a pre-deploy command, but I assume you need this done in build step.

Alternatively, change your code to use env vars directly, this would be the most sensible & straight forward approach.

So in my config.json file can i have

{
  "somevar": "${{SOME_VAR}}"
}

And railway will automatically replace it upon deploy?

if you tell it to.

You'll need to setup your dockerfile/build/pre-deploy command to do that.

You can use any utils your image has

does envsubst exist in ubuntu?

Should exist in all unix based envs (assuming it hasn't been stripped on image creation), yes

https://www.baeldung.com/linux/envsubst-command

tyty

in my Dockerfile, is it just

RUN envsubst < config.json.template > config.json

i ask because when i build it locally it doesn't run (simply replaces with ""). But in the shell i can see the env var set , and upon manually running envsubst it did replace

please see our docs on using variables at build time in a Dockerfile -

I've set both ARG RAILWAY_ENVIRONMENT and ARG MY_VAR immediately after the FROM node line.. it still fails

fails as in .. it never replaced the env var in my .json config file

are you using the correct syntax in your config.json.template file?

ok solved it.. i'm not sure why the SEALED variable requires me to do it twice

i manually updated via the dashboard after i created it. And it worked

sounds good!

@Brody for networking.. i'm having trouble

i exposed the necessary port in my Dockerfile

but /health isn't being reached

you need this section -

argh thanks for the assist

that was it

no problem, any more questions? 🙂

!s