Chef is a configuration management tool that provides a domain-specific language to model the configuration of our infrastructure. Each configuration item in our infrastructure is modeled as a resource. A resource is basically a Ruby method that accepts several parameters in a block. The following example resource describes installing the docker-engine package:
package 'docker-engine' do action :install end
These resources are then written together in Ruby source files called recipes. When running a recipe against a server (a Docker host in our case), all the defined resources are executed to reach its desired state configuration.
Some Chef recipes may depend on other supplemental items, such as configuration templates and other recipes. All this information is gathered in cookbooks together with the recipes. A cookbook is a fundamental unit of distributing...
