Launching a composition and defining a service environment variable using a file

Sometimes when launching a composition there is a need to pass many environment variables to a specific service. In order to do that you can use docker-compose ‘env_file’ field on any service and use files from the current working directory from which the composition is being launched. This will work for both ‘composition’ and ‘launch-composition’ step types.

Using env_file will not work in case you are launching a composition directly from the Compositions view because it is being launched in an empty working directory.

Consider moving the composition launch as part of a usual pipeline which will give you ability to use files from your cloned repository.

Examples

Compositions are being launch inside a working directory, which is the cloned repository by default. This means that you can always reference an ‘env_file’ exactly like you would reference a docker-compose file.

Inline Composition

version: '1.0'
steps:

  inline_composition:
    title: Launch inline composition
    type: launch-composition
    environment_name: 'environment name'
    composition: 
      version: '3'
      services:
        service:
          image: alpine
          env_file: ./env-file

Composition from file

version: '1.0'
steps:

  composition_from_file:
    title: Launch composition from file
    type: launch-composition
    composition: './docker-compose.yml'
    environment_name: 'environment name'