Question

How to pass app environment variables to a Docker container?

I am using App Platform to deploy Spring Boot with Docker. I want to pass a variable to my Spring Boot app.

File: app.yml

name: my-app-name
region: ams3
services:
  - dockerfile_path: Dockerfile
    github:
      branch: BRANCH_NAME
      deploy_on_push: true
      repo: my_name/my_repo
    name: web

File: Dockerfile

FROM gradle:7.5-jdk17-alpine AS build
COPY --chown=gradle:gradle . /home/gradle/src
WORKDIR /home/gradle/src
ENV ACTIVE_PROFILE=APP_ACTIVE_PROFILE
RUN sh ./gradlew web:build --no-daemon

I want to pass APP_ACTIVE_PROFILE which is defined in my App-Level Environment Variables to my docker file.

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Bobby Iliev
Site Moderator
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• March 19, 2023

Hi there,

I recently answered a similar question here:

https://www.digitalocean.com/community/questions/do-app-platform-env-vars-not-available-during-build

As you ar using a Dockerfile, this passes variables down to the docker build process (with a --build-arg parameter) so you can access the values of the environment variables using the ARG keyword in your Dockerfile as you normally would if you were building this on a local machine.

For more information on how to use environment variables with a Dockerfile and the App Platform I could suggest the docs here:

https://docs.digitalocean.com/products/app-platform/reference/dockerfile/#environment-variables

Hope that this helps!

Best,

Bobby