accessing host os file from docker container using python

Question

I want to capture the content of file which is located in the host os (linus) into a variable from the Docker container using a python script

Can I do this

FILE="/home/test/file.txt"
#open the file for read-only
fd = os.open(FILE,os.O_RDONLY)
content = os.read(fd,12)
print content

ended up with this error

OSError: [Errno 2] No such file or directory: '/home/test/file.txt'

Please suggest a way if I am doing it wrong

Answer 1

mount the volume where the file is located into a directory in your docker container

you do this by using the -v flag in docker

for example:

docker run -v <HOST_FOLDER>:/data <IMAGE>

that will mount to the folder data on the root of your container ( /data )