flask-docker

docker build --tag dockerflask:ip .

docker run -d -p 5001:5000 dockerflask:ip

localhost:5001 on browser

Alternatively just use docker pull lordrevolta/dockerflask:ip

Deploy on docker swarm

docker-machine create --driver virtualbox manager

docker-machine create --driver virtualbox worker1

docker-machine create --driver virtualbox worker2

Follow swarm init steps after creating these machines.

Note: A registry is required to create a service with custom image. We can either use a docker registry container or just upload it on docker hub

Create docker service from the image we created in this sample project.

• docker service create --replicas 3 -p 5004:5000 --name flaskservice lordrevolta/dockerflask:ip
  • Takes a lot of time. It will look like it's stuck
• Open <manager ip>:5004
  • Refresh multiple times and random numbers will appear starting from 1. This means requests are split between the workers(or containers to be precise.)
  • If we scale up you will see the counters at the same position for containers that already exist but the new containers that are created because of scaling up start from 1 as expected.

Notes (IGNORE THESE)

Upload a docker image on docker hub

• docker login
• docker tag <image id> <dockerhub username>/imagename:tag
• docker push <dockerhub username>/imagename:tag