如果 RUN 在多阶段构建中失败，则使 Docker 构建停止

Question

我有一个有多个阶段的Dockerfile。中间阶段运行测试。如果测试失败，我希望构建停止，但它继续在下面给出。您可以看到输出在失败的 RUN 命令之后继续。

# Base image
FROM python:3.5 as base

# For running tests
FROM base
WORKDIR /root
RUN mkdir /root/src
ADD src/requirements.txt /root/src
RUN pip install -r /root/src/requirements.txt
ADD . /root
RUN ["/bin/bash", "-c", "cd test; ./run-tests.sh"]

# For publishing src files
FROM base
ADD src /root/src
ADD .pypirc /root/.pypirc

WORKDIR /root/src
CMD python setup.py sdist upload -r local

输出：

Step 6/13 : RUN pip install -r /root/src/requirements.txt
 ---> Using cache
 ---> 56fa7fc2f2e8
Step 7/13 : ADD . /root
 ---> 74c52977edcf
Step 8/13 : RUN ["/bin/bash", "-c", "cd test; ./run-tests.sh"]
 ---> Running in 68a184ab54af
...
----------------------------------------------------------------------
Ran 1 test in 10.122s
FAILED (failures=1)
The command '/bin/bash -c cd test; ./run-tests.sh' returned a non-zero code: 1
running sdist
running egg_info
...
running upload
Submitting dist/<artifact-name>-2.6.1.2.tar.gz to https://<subdomain>.jfrog.io/<context>/api/pypi/python-local
...

Answer 1

你的命令，run-tests.sh ，需要以非零退出代码退出，docker 将停止构建。在这种情况下，已经发生了：

The command '/bin/bash -c cd test; ./run-tests.sh' returned a non-zero code: 1

无论您运行什么来调用docker build都需要处理该退出代码并在该点停止运行。Docker 的行为是给你一个退出代码来指示失败：

$ cat df.fail
FROM busybox
RUN exit 1
RUN echo still running
$ docker build -f df.fail .
Sending build context to Docker daemon  23.04kB
Step 1/3 : FROM busybox
 ---> 59788edf1f3e
Step 2/3 : RUN exit 1
 ---> Running in 70d90fb88d6e
The command '/bin/sh -c exit 1' returned a non-zero code: 1
$ echo $?
1

从上面的示例中，您可以看到 docker 在命令返回非零退出代码后立即停止，它不会运行 echo still running 行，并且docker build本身有一个非零返回代码，您可以使用用于运行构建的任何内容进行处理。