docker-flask-sample

Docker container with Python 2.7 and Flask (Sample from Get Started)

This container was bringin from Docker Get Started Page. I added feature for checking and parsing user agent of visitors.

Libs Imported

• Flask
• pyyaml
• ua-parser
• user-agents

Usages

1. Clone this image
2. Run docker build -t <your_whathever_image_name> . (ended with dot)
3. Run docker images to check images
4. Run docker run -p 4000:80 <your_whathever_image_name> or docker run -d -p 4000:80 <your_whathever_image_name> to detached container on background
5. Locate to http://localhost:4000 from your current browser

Want to stop? Run docker container stop $(docker container ls -a -q)

To Remove containers Run docker container rm $(docker container ls -a -q)

To see list of container running, use docker ps.

Service and Swarm

Docker has a service and swarms feature to demonstrate like load balancing over containers. You need to do is docker-compose.yml :

version: "3"
services:
  web:
    image: emsi_python_sample:latest
    deploy:
      replicas: 2
      resources:
        limits:
          cpus: "0.1"
          memory: 50M
      restart_policy:
        condition: on-failure
    ports:
      - "80:80"
    networks:
      - webnet
networks:
  webnet:

I use local image for this project, you don't need a Docker Cloud account.

And then run this following commands to make it:

1. Run docker swarms init to initialize swarms
2. Then run docker stack deploy -c docker-compose.yml pythonproject to define a new service called pythonproject
3. Run docker service ls to check running service

4. Because we ported the app into port 80, you can access this service through http://localhost:80 and Voila!
5. Refresh it, and make sure container host ID is changed on every hit.

Thank you. And happy coding!