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Configuration Management Software

Configuration Management Software

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Ansible, Puppet, Chef

Ansible

Despite only being released in 2012, Ansible is the most popular of the three tools and arguably the most favored among engineers. Unlike the other tools, Ansible doesn’t require agents to run on target machines. Instead, it uses existing remote administration solutions such as SSH and PowerShell to connect to nodes and run commands. This makes deploying Ansible much easier compared to Chef or Puppet, which require you to deploy and maintain both a controlling service and agents.

Ansible configurations (playbooks) are formatted using YAML and follow an imperative model. Like Puppet modules, playbooks support constructs such as variables, condition statements, loops, and error handling. You can define new tasks by creating modules, which execute Python, Powershell, and even binary applications on a node. Ansible also provides a Python API for controlling nodes, responding to events, creating new plugins, and more.

 

Because Ansible uses an agentless model, changes must be pushed from Ansible to each target machine. While this means target machines won’t be able to periodically check for changes, it allows engineers to deploy configuration changes instantaneously. Ansible tracks agents using a simple configuration file, allowing engineers to manage an infrastructure from any device with Ansible installed.

 

Ansible runs on almost any machine capable of running Python 2 or higher except for Windows machines. It can manage Linux, BSD, and Windows machines.

Puppet

First released in 2005, Puppet is the oldest of the automation tools in this list. Like Chef, Ansible uses declarative files (called modules) to define the final state of your systems. A Puppet deployment consists of client machines (Agents) that periodically poll controllers (Masters) for new modules and updates to existing modules.

 

Puppet uses a unique configuration language inspired by the Nagios configuration file format. It supports common constructs such as variables, condition statements, arrays, classes, and functions, as well as functions written in Ruby. Modules can also contain manifests, which are individual classes or tasks. Modules and manifests are reusable and shareable, allowing you to piece together a deployment from existing components.

 

The open source edition of Puppet is available for free, while Puppet Enterprise is free for up to 10 nodes. Puppet supports Windows, Mac, and Linux agents, while the Puppet server supports Linux.

 

Chef

Chef is a popular configuration management tool initially released in 2009. It uses an imperative model to define infrastructure, in which engineers define the individual steps needed to manage each individual machine. Chef’s definition files are called recipes and can be combined with files, attributes, libraries, and other recipes to create cookbooks. Although recipes use a domain-specific language unique to Chef, they support scripts written in plain Ruby.

Each Chef deployment consists of three main components:

 

Chef Clients are the machines managed by Chef. They periodically pull and execute cookbooks from the Chef Server in order to match the latest declaration.

 

Chef Servers are hubs for storing Chef configuration data such as cookbooks, policies, and client data.

Chef Workstations are used by DevOps engineers to create and deploy cookbooks.

 

Chef is unique in that it also supports an declarative to IaC. This lets engineers define the desired state and leave the implementation details to Chef. Declarative models offer less control, but provide a much easier and less verbose tool for engineers.


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