docker：来自守护程序的错误响应：OCI 运行时创建失败：

Question

I am trying to run my docker image, but I am receiving the following error:

docker: Error response from daemon: OCI runtime create failed: container_linux.go:349: starting container process caused "exec: \"python3\": executable file not found in $PATH": unknown.
ERRO[0000] error waiting for container: context canceled

Here is my Dockerfile:

FROM python:3.6-alpine3.7

RUN apk add --no-cache python3-dev \
    && pip3 install --upgrade pip

RUN apk add --no-cache --update \
    python3 python3-dev gcc \
    gfortran musl-dev

RUN apk add --no-cache libressl-dev musl-dev libffi-dev

RUN python3.6 -m pip install --upgrade pip

RUN apk --no-cache add git

RUN apk add mariadb-dev

WORKDIR /socialworks-api

COPY . /socialworks-api

RUN pip3 --no-cache-dir install -r requirements.txt

ENV PATH="/opt/gtk/bin:$env/development.env"

EXPOSE 5000

ENTRYPOINT ["python3"]
CMD ["app.py"]

I think the issue might be with the ENV PATH which I set. I have also tried setting it to:

ENV PATH="/opt/gtk/bin:${env/development.env}"

But I would receive the following error when building my dockerfile:

Step 11/14 : ENV PATH="/opt/gtk/bin:${env/development.env}"
failed to process "\"/opt/gtk/bin:${env/development.env}\"": missing ':' in substitution

Without setting the environment, my application won't run.

I have also tried running on my dockerfile this command:

RUN export $(grep -v '^#' ./env/development.env | xargs)

It build successfully, but when I enter this command to the terminal:

docker run -it flaskapp

I am receiving an error that it still unable to locate the env variables.

$ docker run -it flaskapp
Traceback (most recent call last):
  File "app.py", line 11, in <module>
    app.config.from_object("config.Config")
  File "/usr/local/lib/python3.6/site-packages/flask/config.py", line 174, in from_object
    obj = import_string(obj)
  File "/usr/local/lib/python3.6/site-packages/werkzeug/utils.py", line 568, in import_string
    __import__(import_name)
  File "/socialworks-api/config.py", line 4, in <module>
    class Config(object):
  File "/socialworks-api/config.py", line 5, in Config
    MYSQL_HOST = os.environ['MYSQL_HOST']
  File "/usr/local/lib/python3.6/os.py", line 669, in __getitem__
    raise KeyError(key) from None
KeyError: 'MYSQL_HOST'

Answer 1

In your Dockerfile you specify

ENV PATH="/opt/gtk/bin:$env/development.env"

When you later run python3 , the system looks in only these two directories, and when there's not a Python there, you get the error you see. It's probably in /usr/bin/python3 , but the directory /usr/bin isn't in $PATH .

The simplest answer here is to delete this line entirely. Your Dockerfile creates neither a /opt/gtk nor a /development.env directory, so there's no files in either path that could be executed. If you do need to install custom software, putting it in a directory that's in the default system path (like /usr/local/bin ) is a good approach.

If you do need to keep this line, make sure the existing $PATH stays as part of the value.

ENV PATH="/opt/gtk/bin:$PATH"

(Don't specify ENTRYPOINT ["python"] ; combine this into a single CMD ["python3", "app.py"] . I'd encourage you to run docker run --rm -it yourimage /bin/sh to look around the filesystem and run debugging commands like env , but the ENTRYPOINT declaration breaks this use, and having the script file named in the CMD means it's still not the "container-as-command" pattern.)