basic project to show how to scale up and down docker-compose services using consul-template and nginx
Docker Compose 1.3 or later
Run the following command in terminal:
docker-compose up
open your browser to http://localhost:8500/ui/. There you will find a webapp service, running on a single node (i.e. a single Docker container)
docker-compose scale webapp=5
check again http://localhost:8500/ui to ensure that there are now five webapp instance.
Make a few requests to http://localhost:8080/ and then run docker-compose logs to see how requests are processed by different webapp instances.
You can now scale down the webapp service without having any down time, e.g.:
docker-compose scale webapp=2
Again, you can check http://localhost:8500/ui to see that there are now only two instances.