python-go-multi-stage

Multi stage docker containers

This is an example of a Multi-Stage builds that runs another programming language application (go package) inside other container (Python Flask). This project is a Flask application that demonstrates connecting to a Postgresql database and running a Go script using subprocess in Python.
The application is containerized with Docker and can be run using docker-compose.

Prerequisites

Docker
Docker Compose

Getting started

1. Build the Docker container: docker-compose build

2. Start the container: docker-compose up -d

-- OR --

docker-compose up [-d] --build 

The application should now be running on http://localhost:8088\ You can also check the status of the database on http://localhost:8088/db-status

---

Configuration

The application reads environment variables from a .env file. The following variables must be set:

DB_HOST: The hostname of the Postgresql database
DB_PORT: The port of the Postgresql database
POSTGRES_DB: The name of the database to connect to
POSTGRES_USER: The username to authenticate with
POSTGRES_PASSWORD: The password to authenticate with

Project Structure

.
├── docker-compose.yml
├── Dockerfile
├── entrypoint.sh
├── README.md
├── .env
└── webapp
    ├── app.py
    ├── requirements.txt
    ├── .env
    └── scripts
        └── helloworld-go

_

docker-compose.yml: Docker Compose configuration file.
Dockerfile: Docker configuration file.
entrypoint.sh: Entrypoint script that runs on container startup (Check the PostgreSQL health).
webapp/app.py: Flask application code.
webapp/requirements.txt: Python requirements file.
webapp/scripts/helloworld-go: Go application that is run inside the Flask application.