Testing-python-api-docker-image

Working with docker image with basic python flask application

Preliminary Installation Requirement

1. Open a command prompt/bash terminal. Check for Python installation using the command - python3 --version

2. If it is not installed, use Homebrew to install (MACOS) - brew install python@3

3. Check for pip version using the command - pip3 --version

4. If it is not installed, use Homebrew to install (MACOS) - python3 get-pip.py

5. Post that, install the virtual environment for the Python Environment to work - virtualenv [Give the name of the virtual Environment that you wanted]

let's assume the name as "pythonEnv"

6. Then, the command will look like - virtualenv pythonEnv

NOTE: The above command will create a new folder with the name that you had provided.

7. Activate the virtual environment, you can find the activate program inside the binary directory of the virtual environment source pythonEnv/bin/activate

Then, you can find the Terminal entering into the virtualenv -> pythonEnv. And, to deactivate the virtual environment, you can use just CMD deactivate in the terminal.

Python Commands required for the flask app to run,

We need to import Flask - pip3 install flask

We need to import flask_restful - pip3 install flask_restful

Then, creating a Dockerfile is required and you can use - touch Dockerfile, this will create without any issues and there is NO .format is required.

Docker Commands

Command 1

docker ps - To check the images and containers that are currently running. This should give you the below details,

CONTAINER ID - 891fc9742d6a
IMAGE - som-flaskapp COMMAND - "python3 app.py" -- This is taken from Dockerfile Entrypoint and CMD so this will work as a startup script. CREATED - The time it was created eg: 9 seconds ago
STATUS - The up-time eg: Up 8 seconds
PORTS - 0.0.0.0:1020->8000/tcp -- NOTE: This is an external that we can access. NAMES - focused_kepler

Command 2

docker run -it -d -p 1020:8000 som-flaskapp

Options;

-d -> runs on daemon mode -p -> Ports 1020 -> external port - This can be anything random and NOT mandatory to have the same port as the internal port. 8000 -> This is the internal port where the Flask app is running. Make sure, this port is the same.

Command 3

docker build -t som-flaskapp:latest .

syntax: docker build -t [imagename:tag] [source_directory]

This will collate all the requirements.txt and the Dockerfile to build a docker container.