extending-chef.md

Ohai

• Write a custom Ohai plugin (that has the docker plugin in it)
• Test ohai with chef-shell or irb (know which one)
• Deploy it with the ohai cookbook using the ohai_plugin resource
• Reload the plugin once a package is installed
• depend on kernel data
• Put docker processes in ohai as a nested hash
• Add some azure data as a hint and use the hint to add data to a plugin
• Disable the plugin
• Remove some ohai content
• Whitelist an attribute

Custom Resources

• use_inline_resources

Chef Handlers

• Write the result of a chef run to a file called results.txt locally
• Deploy the handler with the chef_handler_cookbok and chef_handler resource

Libraries

• Write a library
• Write a resource and provider with a library
• Extend chef with a library

Definitions

• Write a definition (and know why you shouldn't)

Knife Plugins

• Inherit from a knife plugin

Chef API

• Talk to the Chef Server via an API

Ruby

• Create a ruby gem
• Manage ruby gems