Docker Compose의 Extension fields를 활용한 환경 변수 설정

version 3.4에서 Extension fields가 추가되기는 하였으나, version 3.7에서 service, volume, network, config, secret 정의에도 확장되어 version 3.7을 권장합니다.

 version: '3.7'

 x-common-variables: &common-variables
   VARIABLE: some_value
   ANOTHER_VARIABLE: another_value

 services:
   some_service:
     image: someimage
     environment: *common-variables

   another_service:
     image: anotherimage
     environment:
       <<: *common-variables
       NON_COMMON_VARIABLE: 'non_common_value'

참고)

• https://stackoverflow.com/questions/36283908/re-using-environment-variables-in-docker-compose-yml
• https://docs.docker.com/compose/compose-file/compose-file-v3/#extension-fields
• https://github.com/K9Ns/data-pipelines-with-apache-airflow/blob/main/chapter02/docker-compose.yml
• https://meetup.nhncloud.com/posts/277