What are the characteristics of StatefulSets in Kuberne…
StatefulSet is a resource object in Kubernetes used for managing the deployment and scaling of stateful applications. Here are some features of StatefulSet:
- Stable unique network identifiers: Each Pod within a StatefulSet is assigned a stable network identifier automatically generated by the controller, which remains associated with the Pod’s lifecycle. This makes it easier to access and discover stateful applications.
- Ordered deployment and scaling: StatefulSets will create and update Pods sequentially according to the specified order. Each Pod has a unique number that can be used to identify its position in the cluster. When scaling, new Pods will be created in the same order, ensuring consistency and availability of data for stateful applications.
- Stable storage: Each Pod in a StatefulSet can utilize persistent volume storage to keep data consistent even when the Pod is restarted or moved, allowing stateful applications to continue using their previous data.
- Domain resolution: Each Pod in a StatefulSet has a stable domain name that can be used for access. The format of the domain name is
. . .svc.cluster.local, allowing stateful applications to discover and communicate through domain names. - Ordered deletion: When deleting a StatefulSet, the controller will delete Pods one by one in the specified order. This ensures that stateful applications do not lose data during the deletion process.
In summary, StatefulSet in Kubernetes offers stable network identifiers, ordered deployment and scaling, stable storage, domain name resolution, and ordered deletion for stateful applications, making it easier to run and manage them within the platform.
