docker-compose.yaml 内 docker 存储库的变量

Question

Is there any way to have a variable inside docker-compose.yaml for docker repository name? Or any other way of declaring repository outside of image name?

I have a few docker containers in AWS ECR repos and docker-compose file contains several declarations like:

image: <account>.dkr.ecr.<region>.amazonaws.com/<image>:latest

and I would like to declare only once <account>.dkr.ecr.<region>.amazonaws.com to minimize changes required for deployment in other account or moving images to other repository.

Many thanks in advance!

Answer 1

Yes, you can define it in .env file in the same folder than your docker-compose.yaml

.env

ACCOUNT=myaccount
REGION=myregion
IMAGE=niceimage
VERSION=latest

docker-compose.yaml

...
image: ${ACCOUNT}.dkr.ecr.${REGION}.amazonaws.com/${IMAGE}:${VERSION}

You don't need to specify env_file =.env unless you need.env variables inside docker.