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Passing Env variables to a docker container

directly in the shell​

  • We can pass environment variables direct to the container with the -e flag.

Example of a bash script, note this will print/store in our bash history.

sudo docker run -i-e POSTGRES_ENV_USER='userfoo' \
-e POSTGRES_ENV_PASSWORD='bar' \
-e POSTGRES_ENV_DB_NAME='baz' \
-e SITEURL='staging.vincepr.de' \
-p 80:8080 \
-- name container_name dockerhub_id/some_image
  • if we dont want the values in the command line, we could also pull the value from the current (global)environment sudo PASSWORD='foo' docker run ... -e PASSWORD

.env file​

/.env1 file

USERNAME=mike
PASSWORD=foobar
API_KEY=SOME_KEY

and our shell commands

docker run --env-file ./env1.list some_image
docker run --env-file=.env1 --env-file=.env2 some_image

docker-compose​

docker-compose.yml

version: '3.9'

services:

    env_printer:
        image: 'some_image'
        environment:
            - SITEURL=staging.vincepr.de
            - APIKEY: SOME_KEY  # <- we can also pass in our current env variables like so
        env_file:
            - .env1
            - .env2

docker-compose up we can test our configuration with values like so: docker-compose --env-file=some_folder/.env config`