6.multi-stage-production-python.Dockerfile

# ---- Base python ----
FROM python:3.6 AS base
# Create app directory
WORKDIR /app

# ---- Dependencies ----
FROM base AS dependencies  
COPY gunicorn_app/requirements.txt ./
# install app dependencies
RUN pip install -r requirements.txt

# ---- Copy Files/Build ----
FROM dependencies AS build  
WORKDIR /app
COPY . /app
# Build / Compile if required

# --- Release with Alpine ----
FROM python:3.6-alpine3.7 AS release  
# Create app directory
WORKDIR /app

COPY --from=dependencies /app/requirements.txt ./
COPY --from=dependencies /root/.cache /root/.cache

# Install app dependencies
RUN pip install -r requirements.txt
COPY --from=build /app/ ./
CMD ["gunicorn", "--config", "./gunicorn_app/conf/gunicorn_config.py", "gunicorn_app:app"]

Brilliant. You can make the build even lighter by pip the dependencies to a target location and then including them in the pythonpath.

FROM python:3.8.9-alpine3.13 as pythonBuilder
WORKDIR /home/root/server
# any dependencies in python which requires a compiled c/c++ code (if any)
RUN apk update && apk add --update gcc libc-dev linux-headers libusb-dev
COPY ./local-project-folder .
RUN pip3 install --target=/home/root/server/dependencies -r requirements.txt

FROM python:3.8.9-alpine3.13
WORKDIR /home/root/server
# include runtime libraries (if any)
RUN apk update && apk add libusb-dev
COPY --from=pythonBuilder	/home/root/server .
ENV PYTHONPATH="${PYTHONPATH}:/home/root/server/dependencies"
CMD "./server.py"

Hi @rohangeorge91 not able to run server.py in next layer of docker file. everytime i need to run requirment.txt in second layer also.

that's was the reason I gave the pip3 install steps we give a specific path to copy the dependencies and also include them in the python path so that it will scan for them from that directory. Can you share your dockerfile as a Git gist? also to avoid bothering praveen.

@praveenweb, I have one question. What's the use of dependencies layer since you are installing the packages in the release itself?