Docker 构建无法识别作为 `build-arg` 传递的环境变量

Question

我查看了 Can we pass ENV variables through cmd line while building a docker image through dockerfile? which shows me how to pass an environment variable with docker build. After seeing that the environment variable wasn't being defined, I looked at ，但这涉及通过 docker run 传递环境变量。

这是我的 prod.Dockerfile:

FROM ubuntu:20.04

ARG SSH_PRIVATE_KEY

RUN echo "Key is $SSH_PRIVATE_KEY."

和docker build命令：

docker build -f prod.Dockerfile \
             --build-arg SHH_PRIVATE_KEY="$(cat ~/.ssh/id_rsa)" \
             .

结果输出：

Key is .

然而 cat ~/.ssh/id_rsa 的输出是：

-----BEGIN OPENSSH PRIVATE KEY-----
...
-----END OPENSSH PRIVATE KEY-----

我错过了什么？

Answer 1

将SHH_PRIVATE_KEY替换为SSH_PRIVATE_KEY。

docker build -f prod.Dockerfile \
   --build-arg SSH_PRIVATE_KEY="$(cat ~/.ssh/id_rsa)" \
   .

Docker 构建无法识别作为 `build-arg` 传递的环境变量

Docker build not recognizing environment variable passed as `build-arg`

environment-variables

docker

docker-build