Docker runs on WIndows and only on one of two Linux systems - docker

Question

I have a docker image that I have built that runs on my windows laptop as expected. When I copy and load it on to one of my two Linux systems I get this error when I run docker logs:
Error: 'docker/semantic_search_django/gunicorn.conf' doesn't exist
When I inspect the running container on Windows I can see that "missing" file! Furthermore, if I copy and load the same docker image to my second Linux system, it runs as expected.
This issue just happened today. I've been having success on all 3 systems for the past couple of months until today. Any suggestions would be greatly appreciated. Both Linux systems are running Ubuntu 18.04.5 LTS.
I've tried renamed the images, I've stopped and started the docker daemon, I've even restarted both Linux boxes.
Here are the commands I have used:
docker pull my.artifactory.com/ciee_ssrdjango
docker-compose up -d
My docker-compose.yml
version: "3.8"
services:
web:
image: m.artifactory.com/ciee_ssrdjango
env_file:
- proxy.env
- django.env
container_name: ciee_ssrdjango
volumes:
- query-results-volume:/code
expose:
- "${SSRDJANGO_PORT}"
extra_hosts:
dbhost: ${POSTGRES_DOCKER_IP}
depends_on:
- db
networks:
- ssr_network
networks:
ssr_network:
external: true
volumes:
postgresql-volume:
external: true
query-results-volume:
external: true
My Dockerfile:
FROM ubuntu:18.04
ENV PYTHONUNBUFFERED 1
ENV PYTHONDONTWRITEBYTECODE 1
COPY ./requirements.txt /requirements.txt
#prevents being asked to set TZ
ARG DEBIAN_FRONTEND=noninteractive
RUN apt update -y && \
apt -y upgrade && \
apt install -y python3-pip && \
apt install -y build-essential libssl-dev libffi-dev libpq-dev python3-dev && \
apt install -y software-properties-common python3.8
RUN python3 -m pip install --upgrade pip setuptools wheel
ENV TZ=US/Eastern
RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
RUN apt update -y & apt install gcc libxml2-dev libxslt-dev postgresql postgresql-contrib postgresql-plpython-10 --no-install-recommends unixodbc-dev unixodbc libpq-dev -y
RUN mkdir /code # && mkdir /code/ciee
RUN pip install nltk
RUN export PATH=~/.local/bin:$PATH
RUN pip install -r /requirements.txt
COPY . /code/
WORKDIR /code
RUN useradd -m user && chmod 777 /home/user && mkdir /code/query_results && chmod 777 /code/query_results
USER user
CMD ["gunicorn", "semantic_search_django.wsgi:application", "--config", "docker/semantic_search_django/gunicorn.conf", "--keep-alive", "600"]
Here's the thing, I've been using these files and commands successfully for many weeks.

Answer 1

I can make one assumption. You are mounting query-results-volume into /code directory in container and your conf file is located inside it. The volume persists between containers – that's the nature of the volumes. So, somehow, the file in question (or even the folder) has been removed from the volume on the problem machine and now container can not get it.