从 Docker 容器中获取环境变量 [英] Get Environment Variable from Docker Container

问题描述

从 Docker 容器中获取环境变量的最简单方法是什么在 Dockerfile 中没有声明?

What's the simplest way to get an environment variable from a docker container that has not been declared in the Dockerfile?

例如，通过某些 docker exec container/bin/bash 会话设置的环境变量?

For instance, an environment variable that has been set through some docker exec container /bin/bash session?

我可以做 docker exec container env |grep ENV_VAR，但我更喜欢只返回值的东西.

I can do docker exec container env | grep ENV_VAR, but I would prefer something that just returns the value.

我尝试使用 docker exec container echo "$ENV_VAR"，但替换似乎发生在容器外部，所以我没有从容器中获取 env var，而是我自己电脑上的环境变量.

I've tried using docker exec container echo "$ENV_VAR", but the substitution seems to happen outside of the container, so I don't get the env var from the container, but rather the env var from my own computer.

谢谢.

推荐答案

在容器内运行 echo "$ENV_VAR" 以便在容器中发生变量替换的正确方法是:

The proper way to run echo "$ENV_VAR" inside the container so that the variable substitution happens in the container is:

docker exec <container_id> bash -c 'echo "$ENV_VAR"'

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