CODEWITHSUNDEEP
dockerdocker-composeenvironment-variables
fonini
fonini

Reputation: 3351

Dump docker-compose environment variables into file

Is there a way to dump the environment variables in the docker-compose.yml into a file on a given container?

Example:

version: "3"
services:
  api:
    image: registry.gitlab.com/my-api
    environment:
      - TOKEN=123
      - DB_NAME=db

I would like to create a .env file automatically inside the api container after the docker-compose run -d command.

Upvotes: 0

Views: 666

Answers (1)

Stefano
Stefano

Reputation: 5086

Something like this?

version: "3"

services:
  test:
    image: alpine
    environment:
      API_URL: "test"
      TEST: "test"
    volumes:
      - envstorage:/env
    command: "cat /env/storeme"
    depends_on:
      - variable-storer
  variable-storer:
    image: alpine
    environment:
      TEST_1: "test"
      TEST_2: "test"
      TEST_3: "test"
      TEST_4: "test"
      TEST_5: "test"
      TEST_6: "test"
    volumes:
      - envstorage:/env
    command: "sh -c 'env > /env/storeme'"

volumes:
  envstorage:
    name: 'env-test'

NOTE: this is as hacky as it can be.

Upvotes: 1

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