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Kubernetes Deployments vs StatefulSets

In Kubernetes, Deployments and StatefulSets are both controllers used to manage Pods, but they serve different use cases based on whether an application is stateless or stateful.^[400-devops__06-Kubernetes__basics__README.md]

Deployments

Deployments are the standard controller for managing stateless applications.^[400-devops__06-Kubernetes__basics__README.md] They are designed for workloads that do not need to retain unique data or identity, such as web servers or APIs.^[400-devops__06-Kubernetes__basics__README.md]

Characteristics

  • Management of Stateless Apps: Deployments are intended for applications where the Pods are interchangeable and can be replaced at any time without affecting the application's state.^[400-devops__06-Kubernetes__basics__README.md]
  • Intended for Web Servers: Common examples include front-end services or web traffic handlers.^[400-devops__06-Kubernetes__basics__README.md]

StatefulSets

StatefulSets are the controller designed for stateful applications that require stable, unique identifiers and persistent storage.^[400-devops__06-Kubernetes__basics__README.md]

Characteristics

  • Management of Stateful Apps: StatefulSets are used for applications that maintain state to track user interaction or store data.^[400-devops__06-Kubernetes__basics__README.md]
  • Storage Requirements: Unlike stateless applications, databases (like MySQL) require storage to persist data files (e.g., under /var/lib/mysql) even if the container is terminated.^[400-devops__06-Kubernetes__basics__README.md]
  • Dependencies: These workloads are typically relied upon by stateless applications to persist and retrieve data.^[400-devops__06-Kubernetes__basics__README.md]

Sources

  • 400-devops__06-Kubernetes__basics__README.md