A stateful application stores critical data where each instance has its own data, role, and position in the cluster (like databases), and unlike stateless applications, it cannot tolerate pod restarts because Kubernetes treats pods as disposable by default, which can cause data loss or application failure when a stateful pod is restarted with a new identity.
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What is a Stateful Application in Kubernetes?Added:
A stateful application is different.
It stores data that matters. Each instance may have its own data, its own role, and its own position in the cluster. Databases are classic example for this. If one database pod is restarted and comes back as a completely new pod with a new identity, the application can break or lose data. This difference is critical in Kubernetes because the platform by default treats pods as disposable.
That's where problems start.
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