使用Dockerfile设置多行环境变量 [英] Set Multiline Environment Variable with Dockerfile

问题描述

我想在Dockerfile中设置多行环境变量。

I want to set a multiline environment variable in my Dockerfile.

如果我通过 docker run 传递环境变量，一切正常。

If I pass in the environment variable through docker run everything works.

CONFIG="port: 4466
databases:
  prod:
    connector: mysql
    active: true
    host: 33.333.333.333
    port: 3306
    user: root
    password: pass"
docker run --env CONFIG="$CONFIG" ubuntu:latest env | grep 'CONFIG'

输出（仅一行，因为它被解释为多行变量）

Output (its only a single line because its interpreted as multiline variable)

CONFIG=port: 4466

不通过dockerfile工作

Dockerfile

FROM ubuntu:latest
ENV CONFIG 'port: 4466\ndatabases:\n  prod:\n    connector: mysql\n    active: true\n    host: host\n    port: 3306\n    user: root\n    password: pass'

构建并运行docker图片

Build and run the docker image

docker build -t multilinetest .
docker run multilinetest env | grep 'CONFIG'

输出

CONFIG=port: 4466\ndatabases:\n  prod:\n    connector: mysql\n    active: true\n    host: host\n    port: 3306\n    user: root\n    password: pass

期望

两个方案都应存储相同的环境变量（我将这个环境变量传递给需要多行字符串的第三方图像）

Expected

Both scenarios should store the same environment variable (I'm passing this environment variable into a 3rd party image that requires a multiline string)

推荐答案

我能够通过将多行环境变量作为构建arg传递给docker build来使它正常工作。

I was able to get this working by passing the multiline environment variable as a build arg to docker build.

Dockerfile

FROM ubuntu:latest
ARG CONFIG
ENV CONFIG $CONFIG

构建命令

CONFIG="port: 4466
databases:
  prod:
    connector: mysql
    active: true
    host: 33.333.333.333
    port: 3306
    user: root
    password: pass"
docker build --build-arg CONFIG="$CONFIG" ubuntu:latest env | grep 'CONFIG'

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