Building Flask API with Docker ⚗️

Python backend using Python3 Flask With Docker

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SETUP ⚙️

pip3 install Flask

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BUILD 🏗️

Debug Run

export FLASK_APP=flaskr
export FLASK_ENV=development

flask --app flaskr --debug run

Non debug run

  flask --app flaskr --no-debugger

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App will start on http://127.0.0.1:5000

DEPLOYMENT 📦

Build Docker Container Image

docker build --tag python-docker .

Validate Image is created

docker images

Result:

(venv) D:\GitHub\Flask-API>docker images
REPOSITORY      TAG       IMAGE ID       CREATED          SIZE
python-docker   latest    199cf8a5350c   4 minutes ago    145MB

Run Container with flask

docker run -d -p 5000:5000 python-docker

Result:

(venv) D:\GitHub\Flask-API>docker ps
CONTAINER ID   IMAGE           COMMAND                  CREATED         STATUS         PORTS                    NAMES
df3f37944e57   python-docker   "flask --app flaskr …"   3 minutes ago   Up 3 minutes   0.0.0.0:5000->5000/tcp   jovial_joliot

Reference:

• Flask Documentation
• Official Docker Document for Python
• Containerize an application