What is Immutable Infrastructure?
Turkish: Değişmez Altyapı
Immutable infrastructure replaces servers with new images or instances for every change instead of patching running machines in place.
What Is Immutable Infrastructure?
Immutable infrastructure means deploying every change as a new image, container, or virtual machine instance instead of SSHing into a running server to update packages or edit files. The old instance is removed and the new, defined instance takes over.
With this model, servers stop being long-lived machines maintained by hand. Application images, configuration, dependencies, and deployment steps are defined through automation. Rolling back to a previous image or rebuilding the same environment in another region becomes more predictable.
How It Is Applied
Container images, VM image pipelines, blue-green deployment, rolling deployment, and automated health checks are common parts of immutable infrastructure. A Docker image can be built, tested, and promoted through staging and production. Teams using GitOps can track the desired infrastructure state in a Git repository.
What to Watch
Immutable infrastructure requires separating state from servers. Logs, uploads, databases, and user sessions should live in persistent storage or external services. Otherwise, replacing an instance can cause data loss. Image build time, secret handling, and cost tracking also need to be part of the design.