docker python脚本无法正确执行

Question

When I run my container I'm trying to run "docker.py" from the root directory ("/") with "/usr/bin/python". I've checked the source image to ensure the python binary exists, I've uploaded docker.py to the docker image and run it with that binary successfully. However, when I try to create the image and then run the image, I get this error ("EOFError: EOF when reading a line") and I don't know what this means or where to start. Any help is appreciated. Thanks in advance!

cat docker.py

#!/usr/bin/python
my_name = raw_input("Enter your name: ")
print my_name
quit()

cat Dockerfile

FROM python:2.7
ADD docker.py /docker.py
CMD ["/usr/bin/python", "/docker.py"]

docker build .

Sending build context to Docker daemon  175.8MB
Step 1/3 : FROM python:2.7
 ---> b1d5c2d7dda8
Step 2/3 : ADD docker.py /docker.py
 ---> f55a19158773
Step 3/3 : CMD ["/usr/bin/python", "/docker.py"]
 ---> Running in b830da5a2f5b
 ---> ef5b878d203f
Removing intermediate container b830da5a2f5b
Successfully built ef5b878d203f
SECURITY WARNING: You are building a Docker image from Windows against a non-Windows Docker host. All files and directories added to build context will have '-rwxr-xr-x' permissions. It is recommended to double check and reset permissions for sensitive files and directories.

docker run ef5b878d203f

Enter your name: Traceback (most recent call last):
  File "/docker.py", line 2, in <module>
    my_name = raw_input("Enter your name: ")
EOFError: EOF when reading a line

Answer 1

The trouble is that your docker.py script is expecting input. As @Klaus D. was commenting, for the raw_input command you need to be in an interactive shell. When you're running inside a docker container, there is no interactive shell, so when you run raw_input it just gets an unexpected end to that command hence the error you receive.

Once you start the container, from a user perspective it is like a little virtual machine, the only interaction you can have with it is through methods that you have set up within the container itself. Or else to enter the container using:

docker exec -it CONTAINER_HASH /bin/bash

from there you've got an interactive shell and if you log in like that THEN you can run

python /docker.py

and it works as you would expect.