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timebomb_spice.yml

README.md

Timebomb Chef example

This is a demonstration of using Chef to provision EC2 servers to run a fragile python app. It is intended to show an interesting example of what is possible with Chef, but is not an example of how to use Chef. I've intentionally taken many shortcuts to simply this example, which is not appropriate for production use.

The python app

Timebomb is a fragile python app with a significant bug: sending a POST request to /boom will blow up the app server.

timebomb.py

Launch

spiceweasel --parallel timebomb_spice.yml | bash

Open the HAProxy web console

open http://`knife search node 'role:load_balancer' -a ec2.public_hostname |grep ec2.public_hostname | cut -f4 -d" "`:22002/

Reload HAProxy

knife ssh 'role:load_balancer' -a ec2.public_hostname -x ubuntu 'sudo chef-client'

Hit one of the web servers

curl http://`knife search node 'role:load_balancer' -a ec2.public_hostname |grep ec2.public_hostname | cut -f4 -d" "`

Blow up a web server

curl -X POST http://`knife search node 'role:load_balancer' -a ec2.public_hostname |grep ec2.public_hostname | cut -f4 -d" "`/boom

Add a webserver

spiceweasel timebomb_spice.yml | grep create | grep app | uniq | bash

Cleanup

spiceweasel -d timebomb_spice.yml | bash
knife client bulk delete i-.\*

Further reading

Mike Fiedler has a much more elaborate chef example available at: Full Stack.