Cattle vs. Pets: A Modern Approach to Server Management

Rethinking How We Treat Our Servers

In the world of server administration, a crucial concept discussed in the ‘Ubuntu System Administration Guide’ is the ‘cattle vs. pets’ analogy. Traditionally, servers were treated like pets: each one was unique, lovingly cared for, and manually updated. The modern, more resilient approach treats servers like cattle: they are uniform, automated, and disposable.

The ‘Pets’ Approach (The Old Way)

A ‘pet’ server is maintained for a long time. You log in to it, install software, apply patches, and fix issues as they arise. This makes the server unique and often difficult to replace quickly if something goes wrong.

The ‘Cattle’ Approach (The New Way)

With the ‘cattle’ approach, servers are designed to be identical and easily replaceable. Instead of logging in to fix a problem or apply an update, you simply destroy the old server and deploy a new, updated one from a standard image. This method, which is the foundation of cloud computing and automation, leads to more robust and predictable systems.

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This post is based from content of the book Ubuntu System adminstration guide. And the book can be found here https://www.amazon.com/stores/Mattias-Hemmingsson/author/B0FF5CQX13