Knife, the command-line client for the Chef server, has a plugin system. This plugin system enables us to extend the functionality of knife
in any way we need. The knife-ec2
plugin is a common example: It adds commands such as ec2
server create
to knife.
In this section, we will create a very basic custom knife plugin to learn about all the required building blocks of knife plugins. As knife plugins are pure Ruby programs that can use any external libraries, there are no limits to what you can make knife do. This freedom enables you to build your whole DevOps workflow on knife, if you want to.
Now, let's teach knife how to tweet in your name!
Make sure you have a Twitter user account and have created an application with Twitter (https://apps.twitter.com/app/new).
While creating your Twitter application, you should set the OAuth
access level to Read and write, so as to enable your application to post in your name.
Create an access token by connecting...