#6581 env variables from .env file are not set in docker compose file

[Anonymous]

Originally created by: spatchamatla

ENVIRONMENT VARIABLES from .env are setting to empty string in docker compose file

Context information (for bug reports)

Output of docker-compose version

docker-compose version 1.23.2, build 1110ad01
docker-py version: 3.6.0
CPython version: 3.6.6
OpenSSL version: OpenSSL 1.1.0h  27 Mar 2018

Output of docker version

Client: Docker Engine - Community
 Version:           18.09.2
 API version:       1.39
 Go version:        go1.10.8
 Git commit:        6247962
 Built:             Sun Feb 10 04:12:39 2019
 OS/Arch:           darwin/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          18.09.2
  API version:      1.39 (minimum version 1.12)
  Go version:       go1.10.6
  Git commit:       6247962
  Built:            Sun Feb 10 04:13:06 2019
  OS/Arch:          linux/amd64
  Experimental:     true

Output of docker-compose config
(Make sure to add the relevant -f and other flags)

WARNING: The POSTGRES_VERSION variable is not set. Defaulting to a blank string.
WARNING: The POSTGRES_USER variable is not set. Defaulting to a blank string.
WARNING: The POSTGRES_PASSWORD variable is not set. Defaulting to a blank string.
WARNING: The POSTGRES_DB variable is not set. Defaulting to a blank string.
services:
  testpg:
    environment:
      POSTGRES_DB: ''
      POSTGRES_PASSWORD: ''
      POSTGRES_USER: ''
      POSTGRES_VERSION: '9.6'
    expose:
    - 5432
    image: 'testpgimage:'
    ports:
    - published: 5432
      target: 5432
version: '3.7'

Steps to reproduce the issue

postgreServer-test.yml

# To execute this docker-compose yml file use docker-compose -f <file_name> up
# Add the "-d" flag at the end for detached execution
version: "3.7"
services:
    testpg:
        env_file:
          - POSTGRES_SERVER.env
        image: testpgimage:${POSTGRES_VERSION}
        ports:
            - 5432:5432
        environment:
            - POSTGRES_USER=${POSTGRES_USER}
            - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
            - POSTGRES_DB=${POSTGRES_DB}
        expose:
            - 5432

POSTGRES_SERVER.env

POSTGRES_VERSION=9.6
POSTGRES_USER=testuser
POSTGRES_PASSWORD=testPWD
POSTGRES_DB=testdb

Expected result

services:
  testpg:
    environment:
      POSTGRES_VERSION='9.6'
      POSTGRES_USER='testuser'
      POSTGRES_PASSWORD='testPWD'
      POSTGRES_DB='testdb'
    expose:
    - 5432
    image: 'testpgimage:9.6'
    ports:
    - published: 5432
      target: 5432
version: '3.7'

Additional information

OS version / distribution, docker-compose install method, etc.
Mac OS 10.14.3, docker installed as desktop

[Anonymous]

Originally posted by: ps23

The following pulls the environment variables into the container that is created. It does NOT substitute the placeholders in the yml file.

env_file:
          - POSTGRES_SERVER.env

Steps to correct your approach

postgreServer-test.yml

version: "3.7"

services:
    testpg:
        image: testpgimage:${POSTGRES_VERSION}
        ports:
            - 5432:5432
        environment:
            - POSTGRES_USER=${POSTGRES_USER}
            - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
            - POSTGRES_DB=${POSTGRES_DB}
        expose:
            - 5432

.env

POSTGRES_VERSION=9.6
POSTGRES_USER=testuser
POSTGRES_PASSWORD=testPWD
POSTGRES_DB=testdb

docker-compose -f postgreServer-test.yml config

services:
  testpg:
    environment:
      POSTGRES_DB: testdb
      POSTGRES_PASSWORD: testPWD
      POSTGRES_USER: testuser
    expose:
    - 5432
    image: testpgimage:9.6
    ports:
    - published: 5432
      target: 5432
version: '3.7'

[Anonymous]

Originally posted by: spatchamatla

Thanks for replying @ps23. Can I also know which OS you ran on... I'm running in Mac OS 10.14.3

tried above with .env file which resides in the same folder as .yml file, but still not populating

docker-compose -f postgreServer-test.yml config

WARNING: The POSTGRES_VERSION variable is not set. Defaulting to a blank string.
WARNING: The POSTGRES_USER variable is not set. Defaulting to a blank string.
WARNING: The POSTGRES_PASSWORD variable is not set. Defaulting to a blank string.
WARNING: The POSTGRES_DB variable is not set. Defaulting to a blank string.
services:
  testpg:
    environment:
      POSTGRES_DB: ''
      POSTGRES_PASSWORD: ''
      POSTGRES_USER: ''
    expose:
    - 5432
    image: 'testpgimage:'
    ports:
    - published: 5432
      target: 5432
version: '3.7'