akulinsk/haproxy-lb-to-apache repository overview

⁠Apache Backend Image

⁠Purpose

This image is used to demonstrate how Apache httpd server can be a backend for a load balancer. It serves up a single HTML page that shows the hostname of the container.

⁠Prerequisites

To use a pre-built docker image available (on the Container Cloud Service hosts) as part of a stack, add OCCS_PULL_ON_CREATE=false as an environment variable. This is helpful in development when building the docker image on the mesh leader.

⁠Usage

Start the container and publish port 80 to some port on the host.

docker run -d -p :80 occs/apache-backend

Find the dynamic port on the host which the container's port 80 is published to:

docker ps
# b139cd126fb7        occs/apache-backend   "/start.sh"         5 seconds ago       Up 4 minutes        443/tcp, 0.0.0.0:32790->80/tcp   angry_leakey`

When curling the address, the response will include the $HOSTNAME from the container in the HTML:

curl http://localhost:32790
# <h1>b139cd126fb7</h1>

By returning the container's $HOSTNAME, you will easily be able to tell which backend responded in a multicontainer setup.