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DevOps & Automation · Foundational

Pets vs Cattle

An analogy contrasting uniquely cared-for servers (pets) with interchangeable, replaceable servers (cattle).

Definition

Pets are hand-configured and nursed back to health when sick; cattle are identical, automated, and simply replaced when they fail. Cloud-native and immutable designs treat servers as cattle.

Example

A failed Kubernetes node is drained and replaced by the node pool autoscaler instead of being repaired.

Exam tip

Cattle-style design is the cloud-native best practice; pets indicate snowflake servers and drift risk.

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