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LAB01-FirstImageFirstContainer.md

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LAB-01: First Image and First Container

This scenario shows how to build an image from Dockerfile, how to run a docker container from this image.

Steps

  • Create a directory (“example”) on your Desktop.
  • Create a file (“index.py”) in the “example” directory (copy from below) (this is a simple Flask that returns “Hello World” on the browser).
from flask import Flask
app = Flask(__name__)
@app.route("/")
def hello():
    return "Hello World!"
if __name__ == "__main__":
    app.run(host="0.0.0.0", port=int("5000"), debug=True)
  • Create “Dockerfile” (there is no extension) in the “example” directory (Copy from below) (it copies to /app directory in the container, run requirements.txt, expose 5000 port and run python app).
FROM python:alpine3.7
COPY . /app
WORKDIR /app
RUN pip install -r requirements.txt
EXPOSE 5000
CMD python ./index.py
  • Create “requirements.txt” and copy it below (it only includes “flask”).
flask
  • Now, we have 3 files in the “example” directory.

image

  • Run on the terminal which is open in “example” directory, “docker build --tag my-python-app .” (creating an image from Docker file and the image name is “my-python-app”, it runs in order, first download python image which is run on Alpine, finally it is prepared to run “CMD python ./index.py” while running container).
docker build --tag my-python-app .

image

  • Run on terminal “docker run --name python-app -p 5000:5000 my-python-app” (run container from created image “my-python-app”, container name is “python-app”, host port 5000 binds to container port 5000).
docker run --name python-app -p 5000:5000 my-python-app

image

  • Open Browser (http://127.0.0.1:5000) to see the result. You created the first Docker image and run the first container. Congratulations! 😊

image