Docker-compose setup script to set environment variables from within container

Question

I have a docker-compose file that will startup 6 different microservices. The way our docker-repository is setup prevents the use of the 'latest' tag so I am looking for a way to run a script before docker-compose pulls the microservice images, which will set environment variables in the scope of the docker-compose.yml file.

version: '3'
services:
  #Service 1
  svc1:
    image: some-snapshot.docker.privaterepo.com/some-service:${LATEST_SVC_TAG}
    container_name: service1
    ports:
      - "8080:8080"
  #Service 2
  svc2:
    image: some-snapshot.docker.privaterepo.com/some-service2:${LATEST_SVC2_TAG}
    container_name: service2
    ports:
      - "8081:8081"

larsks · Accepted Answer · 2017-12-12 21:15:19Z

3

I'm not sure you really need "a script". You can just run something like:

LATEST_SVC_TAG=1.1 LATEST_SVC2_TAG=2.5 docker-compose up -d

Alternately, you could place those into a .env file locally:

cat > .env <<EOF
LATEST_SVC_TAG=1.1
LATEST_SVC2_TAG=2.3
EOF

docker-compose up -d

answered Dec 12, 2017 at 21:15

larsks

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2 Comments

Alex Over a year ago

Sorry I wasn't clear, I need to be able to not hard-code the version numbers, and have this run on a CI server. i.e on a new push to master, pull down all the latest images for the other services and run some tests against them.

larsks Over a year ago

If you need this to run on your CI server, just make the versions parameters to your CI jobs and expose them into the CI environment. Or are you looking for a script that will list all the available versions of your images, inspect the tags, and figure out which one is the most recent, and use that one?

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