What is the difference between Deployment, StatefulSet, and DaemonSet in Kubernetes?
sobes.tech AI
Answer from AI
In Kubernetes, there are several types of controllers for managing pods, each solving different tasks:
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Deployment — used for managing stateless applications. It provides declarative updates for pods, scaling, and rollbacks. It supports creating a ReplicaSet that monitors the number of replicas.
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StatefulSet — designed for stateful applications where a stable pod identity, startup and shutdown order, and persistent storage are important. For example, databases, cache services. StatefulSet guarantees that pods will have persistent names and retain their storage attachment.
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DaemonSet — ensures a copy of a pod runs on each (or selected) node in the cluster. Used for system services such as logging, monitoring, network agents.
Briefly:
| Controller | Purpose | Features |
|---|---|---|
| Deployment | Stateless applications | Scaling, updates, rollback |
| StatefulSet | Stateful applications | Persistent names, order, storage |
| DaemonSet | System agents on each node | Running a pod on all/selected nodes |