How to use multiple image tags with docker-compose

Question

According to this and this GitHub issues, currently there is no native way how to supply multiple tags for a service's image when using docker-compose to build one or multiple images.

My use case for this would be to build images defined in a docker-compose.yml file and tag them once with some customized tag (e.g. some build no. or date or similar) and once as latest.

While this can be easily achieved with plain docker using docker tag, docker-compose only allows to set one single tag in the image key. Using docker tag together with docker-compose is not an option for me since I want to keep all my docker-related definitions in the docker-compose.yml file and not copy them over into my build script.

What would be a decent work-around to achieve setting of multiple tags with docker-compose and without having to hardcode/copy the image names first?

Answer 1

I have some nice and clean solution using environment variables (bash syntax for default variable value, in my case it is latest but you can use anything ), this is my compose:

version: '3' services:   app:     build: .     image: myapp-name:${version:-latest} 

build and push (if you need to push to the registry) with the default tag, change the version using environment variable and build and push again:

docker-compose build docker-compose push export version=0.0.1 docker-compose build docker-compose push 

Answer 2

You can also take the following approach:

# build is your actual build spec build:   image: myrepo/myimage   build:   ...   ... # these extend from build and just add new tags statically or from environment variables or  version_tag:   extends: build   image: myrepo/myimage:v1.0 some_other_tag:   extends: build   image: myrepo/myimage:${SOME_OTHER_TAG} 

You can then just run docker-compose build and docker-compose push and you will build and push the correct set of tagged imaged