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Notes about working with Docker

Steps to run container with mounted volumes

  • I have a model that takes as an input an image
  • A model make predictions over the image
  • The output is an xml file
  • I need the container to read the image from an specific directory in the host
  • I need the container to write the results in an specific directory in the hots

The Dockerfile:

FROM ubuntu:latest

# Update package list and install GDAL and Python dependencies
RUN apt-get update && \
    apt-get install -y python3 python3-pip gdal-bin libgdal-dev ffmpeg libsm6 libxext6

# Set environment variables for GDAL
ENV GDAL_DATA=/usr/share/gdal/


# Keeps Python from generating .pyc files in the container

# Turns off buffering for easier container logging


# Install pip requirements
COPY ./requirements.txt /app/requirements.txt
RUN pip install --no-cache-dir --upgrade -r /app/requirements.txt

COPY . /app

# Define the input and output folder as volumes
VOLUME /app/input_files
VOLUME /app/predictions

# Creates a non-root user with an explicit UID and adds permission to access the /app folder
# For more info, please refer to
RUN adduser -u 5678 --disabled-password --gecos "" appuser && chown -R appuser /app
USER appuser

CMD ["python3", "", "--input_folder=/app/input_files", "--output_folder=/app/predictions"]

After I build the image with the name predict_io, I can run the container indicating the paths in my host. Also, this container needs to run using the host GPU:

docker run --gpus all -v /home/ronny/Desktop/io_test/in/:/app/input_files -v /home/ronny/Desktop/io_test/out/:/app/predictions predict_io

When the container runs, it will retrieve the image from /home/ronny/Desktop/io_test/in/, and it will write the results on /home/ronny/Desktop/io_test/out/

If I receive the error: Permission denied, I will have to change the permissions in the host output folder. I did it with:

chmod a+w /home/ronny/Desktop/io_test/out/