Cobbler

Definition

Cobbler is an open-source Linux installation server that automates network-based provisioning of operating systems onto physical or virtual machines using PXE booting, kickstart or preseed files, and DHCP/DNS/TFTP configuration. It focuses narrowly on the initial OS-installation stage of server provisioning rather than ongoing configuration management, which is typically handed off to a separate tool once a machine is installed and running.

Overview

Before configuration-management or lifecycle tools can enforce state on a server, that server needs an operating system installed in the first place, and doing this manually for each new machine in a data center does not scale. Cobbler was built to automate this specific step: a new machine network-boots via PXE, requests an installation profile from Cobbler, and receives an automated, unattended OS install driven by a kickstart file (for Red Hat-based systems) or preseed file (for Debian-based systems), with no manual interaction required at the console. Mechanically, Cobbler manages the pieces that make PXE-based network installation work together: it configures a TFTP server to serve boot images, integrates with or manages DHCP so machines receive the right boot instructions, mirrors or references distribution installation media, and generates kickstart or preseed files from templates that Cobbler manages centrally. An administrator defines profiles combining a distribution, a kickstart template, and any post-install customization, then associates specific physical or virtual systems with a profile, after which Cobbler handles the automated installation whenever that system network-boots. Cobbler occupies a narrower slice of the provisioning problem than Foreman, which built PXE-based provisioning support similar to Cobbler's but also layers in configuration-management integration, reporting, and lifecycle management on top. Some Foreman deployments have historically used Cobbler as a provisioning backend before Foreman developed more of that functionality natively. Cobbler is more comparable in scope to MAAS, Canonical's bare-metal provisioning tool, though MAAS is more tightly integrated with Ubuntu and cloud-style machine management workflows. In practice, Cobbler is used in data centers and labs that need to reimage or provision many physical machines with a specific OS quickly and consistently, often as a step that precedes handoff to a configuration-management tool like Puppet or Ansible for ongoing state enforcement. The main limitation is scope: Cobbler stops at OS installation and does not manage configuration drift or ongoing compliance afterward, so it is typically paired with another tool for that purpose. It has also seen less active development in recent years compared to more actively maintained provisioning tools, and organizations evaluating new provisioning infrastructure today often consider Foreman or MAAS as more actively supported alternatives covering similar or broader ground, particularly when long-term maintenance and community responsiveness matter as much as the initial feature set. Existing Cobbler deployments continue to work reliably for their narrow purpose, but they are rarely the starting point for a new provisioning build-out today.

Key Features

• Automates PXE-based network installation of operating systems
• Generates kickstart and preseed files from centrally managed templates
• Manages or integrates with DHCP and TFTP services for network booting
• Mirrors distribution installation media for local network installs
• Associates physical or virtual systems with reusable provisioning profiles
• Supports both Red Hat-based and Debian-based installation formats
• Provides a command-line and web interface for managing profiles and systems
• Can serve as a provisioning backend for other lifecycle tools

Use Cases

Alternatives

Frequently Asked Questions

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