How to create docker image

 1. keep your code ready

2. write docker file:

Dockerfile

# downloaded base image

FROM python:3.8-alpine

# copied code from current location to app folder inside docker

COPY . /app

# redirecting to app folder inside docker

WORKDIR /app

# install all libraries inside your docker

RUN pip install -r requirement.txt

# running the final Python code

CMD python app.py

3. download the docker desktop on your computer

4. in the command prompt go to the location of dockerfile and run

    1. to create a docker image

    docker build -t <docker image name> .

    #example => docker build -t first-docker-image .

    2. to see existing docker images

    docker images

    3. to run the created docker image

    docker run -p <port>:<port> <image name>

    #example => docker run -p 5000:5000 first-docker-image

    here once you run, you get two ip address, one is your localhost address and another one is docker image ip address that will not work on our local computer. so take computer localhost to run

    4. to see all running docker images

    docker ps

    5. to stop the running docker image

    docker stop <container name>

    6. to delete the existing docker image

    docker image rm -f <docker image name>

    #example => docker image rm -f first-docker-image

    7. to change docker image name

    docker tag <current name> <new name>

    docker tag first-docker-image first-docker-image-1

    8. to push your docker image to repository

        login to docker

        1. docker login

        2.  docker push <image name>:<version>

        #example => docker push first-docker-image-1:latest

        now your image will be visible on the repository

    

    9. pull any image from docker

        docker pull <image name>:<tag> 

        #example => docker pull first-docker-image-1:latest