Simple http 'hello world' for load balancer testing

This image is a simple 'Hello world' in an HTTP server to be used to test load balancers. When receive an request (GET /) this image will return the current machine hostname.

It shows Hello from <hostname> for every request, making it easier to determine what host received the request.

Running a simple test

docker run --rm -it -p 80:80 strm/helloworld-http

Will result in a single instance running on your port 80, you can test and will get a result like it:

Implementing a load balancer

Now what this image is made for, test load balancers, create the following docker-compose.yml

version: '2'
services:
    front:
        image: strm/nginx-balancer
        container_name: load-balancer
        ports:
            - "80:8080"
        environment:
            - "NODES=web1:80 web2:80"
    web1:
        image: strm/helloworld-http
    web2:
        image: strm/helloworld-http

To run the image use the command:

docker-compose up

And you will see in the result that the balancer is working and balancing the request through images web1 and web2