多阶段构建中的Docker环境变量

鉴于此.env文件:

TEST=33333

鉴于此docker-compose.yml文件:

  service_name:
    image: test
    env_file: .env
    environment:
      TEST: 22222

鉴于此Dockerfile文件:

FROM an_image AS builder

FROM another_image
ENV TEST 11111

CMD ["/bin/echo $TEST"]

每当我在容器中构建并运行此图像时,它都会打印出来11111.

如果我ENV 11111从Dockerfile中删除该行,我的TEST环境变量为空...

父图像是接收环境变量而不是子图像？

谢谢!

编辑:

尝试ENV TEST ${TEST}不起作用($ TEST为空)

删除ENV TEST不起作用($ TEST为空)

Mike Gleason.. 9

所以这不是一个多阶段的问题.

看来ENV变量仅在运行containers(docker-compose up)时使用.不是在构建时(docker-compose build).所以你必须使用arguments:

.env:

TEST=11111

docker-compose.yaml:

version: '3'
services:
  test:
    build:
      context: .
      args:
        TEST: ${TEST}

Dockerfile:

FROM nginx:alpine
ARG TEST
ENV TEST ${TEST}
CMD ["sh", "-c", "echo $TEST"]

测试命令:

docker rmi test_test:latest ; docker-compose build && docker run -it --rm test_test:latest

说真的,文档有点缺乏.

参考:https://github.com/docker/compose/issues/1837

所以这不是一个多阶段的问题.

看来ENV变量仅在运行containers(docker-compose up)时使用.不是在构建时(docker-compose build).所以你必须使用arguments:

.env:

TEST=11111

docker-compose.yaml:

version: '3'
services:
  test:
    build:
      context: .
      args:
        TEST: ${TEST}

Dockerfile:

FROM nginx:alpine
ARG TEST
ENV TEST ${TEST}
CMD ["sh", "-c", "echo $TEST"]

测试命令:

docker rmi test_test:latest ; docker-compose build && docker run -it --rm test_test:latest

说真的,文档有点缺乏.

参考:https://github.com/docker/compose/issues/1837