Network Automation Tools: Ansible vs Puppet vs Chef

Choosing the right network automation tool can feel overwhelming when you're just getting started. Ansible, Puppet, and Chef are three of the most widely used platforms in enterprise environments, and they each take a different approach to solving the same core problem: automating repetitive infrastructure tasks so engineers can focus on higher-value work.

This post focuses on the key differences between these three tools and where each one shines in a network context. We'll keep the scope practical so you can make an informed decision for your environment.

What Are Network Automation Tools?

Network automation tools let you define, deploy, and manage network configurations programmatically. Instead of SSH-ing into 50 switches and making changes by hand, you write a script or configuration file once, and the tool handles the execution across your entire fleet. The benefits are consistency, speed, and auditability.

Ansible: The Network Engineer's On-Ramp

Ansible is arguably the most popular starting point for network automation, and for good reason. It is agentless, meaning it does not require any software to be installed on the managed devices. It connects over SSH (or NETCONF/RESTCONF for network gear) and executes tasks directly.

Ansible uses playbooks, which are written in YAML. This makes them readable even to engineers who are not experienced developers. Here is a simple example that backs up running configurations from a Cisco IOS device:

---
- name: Backup Cisco IOS Configs
  hosts: cisco_routers
  gather_facts: no
  tasks:
    - name: Gather IOS configuration
      cisco.ios.ios_config:
        backup: yes

Ansible is push-based, meaning your control node initiates changes and pushes them out. This works well for network teams who want to run automation on demand, like during a maintenance window.

Best for: Teams new to automation, ad-hoc tasks, multi-vendor environments, and network-specific use cases. The ansible-galaxy ecosystem includes modules from Cisco, Arista, Juniper, and more.

Puppet: Policy Enforcement at Scale

Puppet takes a declarative approach. You define the desired state of your infrastructure, and Puppet continuously enforces that state. It uses a pull-based model where managed nodes (called agents) check in with a Puppet server on a schedule (every 30 minutes by default) and apply any changes needed to match the defined policy.

Puppet configurations are written in its own domain-specific language (DSL) called the Puppet language, which has a steeper learning curve than Ansible's YAML. Here is a minimal example:

class network_baseline {
  file { '/etc/network/interfaces':
    ensure  => present,
    content => template('network/interfaces.erb'),
  }
}

Puppet requires an agent installed on managed nodes, which works well for servers but can be limiting with traditional network hardware that does not support agent installation. However, Puppet Bolt, an agentless task runner from Puppet Labs, addresses this gap for network devices.

Best for: Large enterprises with dedicated infrastructure teams, environments where continuous compliance enforcement is critical, and server-heavy mixed environments.

Chef: Developer-First Infrastructure Automation

Chef is the most developer-centric of the three. Configurations are written in Ruby-based DSL, and you work with concepts like cookbooks, recipes, and resources. If your team has strong development experience, Chef offers tremendous flexibility and testability through tools like Test Kitchen and ChefSpec.

Like Puppet, Chef uses a pull-based, agent model. The Chef Infra Client runs on each managed node and periodically checks in with the Chef Infra Server.

Best for: Teams with software development backgrounds, complex application infrastructure, and environments where infrastructure-as-code practices are mature.

Side-by-Side Comparison

• Architecture: Ansible is agentless (push). Puppet and Chef use agents (pull).
• Language: Ansible uses YAML. Puppet uses its own DSL. Chef uses Ruby.
• Learning curve: Ansible is lowest, then Puppet, then Chef.
• Network device support: Ansible leads here with native modules for most vendors.
• Continuous compliance: Puppet and Chef enforce drift automatically. Ansible requires scheduled runs.
• Community: All three have large communities, but Ansible's network automation community is particularly active.

Which One Should You Start With?

If you are a network engineer looking to automate Cisco, Arista, or Juniper environments, start with Ansible. It requires the least setup, the syntax is approachable, and the vendor-specific module libraries are excellent. As your automation maturity grows, you can evaluate Puppet or Chef if your organization needs continuous enforcement or has a development-heavy culture.

The honest answer is that most network teams settle on Ansible. It solves 80% of network automation problems with 20% of the complexity.

What's Next

Now that you have a handle on how these tools compare at a high level, the next post will dive into getting started with Ansible for network automation, including setting up your inventory file, writing your first playbook, and connecting to a real Cisco IOS device. If you have been waiting for a reason to actually try this hands-on, that post is your starting point.