Multi-stage Docker builds let you write Dockerfiles with multiple FROM statements. This means you can create images which derive from several bases, which can help cut the size of your final build. i.e. Multistage builds feature in Dockerfiles enables you to create smaller container images with better caching and smaller security footprint.
- Generate a Dockerfile inorder to build a docker image. Always keep in mind that this file should be placed inside a specific folder.
$ vim Dockerfile
FROM alpine:3.8 As github
RUN mkdir /var/flaskapp
WORKDIR /var/flaskapp
RUN apk update && apk add --no-cache git
RUN git clone https://github.com/Swathikarun/docker-python-flask.git .
FROM alpine:3.8
RUN mkdir /var/flaskapp
WORKDIR /var/flaskapp
COPY --from=github /var/flaskapp/* ./
RUN apk update && apk add --no-cache python3
RUN pip3 install -r requirements.txt
EXPOSE 5000
CMD ["/usr/bin/python3" , "app.py"]
- Create a docker image
$ docker build -t swathikarun/flaskapp:v1 .
- List the image
$ docker image ls
$ docker container run --name app -d -p 80:5000 swathikarun/flaskapp:v1
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