Immutable Infrastructure
Servers are never modified after deployment. To update, you build a new image and replace the old instance entirely. Eliminates configuration drift.
What is Immutable Infrastructure?
Servers are never modified after deployment. To update, you build a new image and replace the old instance entirely. Eliminates configuration drift.
Immutable Infrastructure is a intermediate-level concept that sits in the DevOps & CI/CD area of system design. Engineers reach for it whenever they need to reason about real-world trade-offs in that space — not just for textbook correctness, but because real production systems at companies like Netflix, Amazon, and Google make these decisions every day.
If you want to go deeper than this definition — with diagrams, code, and a quiz to lock it in — work through the "Immutable Infrastructure" lesson linked below. It walks through the why, the mechanism, the trade-offs, and how the giants actually use it in production.
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Full interactive lesson with diagrams, code examples, real-world references, and a quiz.
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See also
Related glossary terms you might want to look up next.
Docker
A platform for packaging applications into lightweight, portable containers. 'Works on my machine' becomes 'works everywhere.'
Infrastructure as Code
Managing servers, networks, and cloud resources through declarative configuration files instead of manual setup. Terraform, Pulumi, and CloudFormation are IaC tools.
Blue-Green Deployment
A deployment strategy using two identical environments. Traffic switches from blue (current) to green (new) instantly, with easy rollback.