Persistent Volume
A storage resource in Kubernetes that remains available beyond the lifecycle of individual pods.
Description
In the context of AWS, a Persistent Volume (PV) is a key component of Kubernetes for managing storage that is independent of the lifecycle of pods. Unlike ephemeral storage that gets deleted when a pod is terminated, a Persistent Volume allows for data to persist even when applications or containers are restarted or rescheduled. PVs can be backed by various types of storage solutions available in AWS, such as Amazon Elastic Block Store (EBS) or Amazon S3. This persistent nature is crucial for applications that require consistent storage, such as databases or user-generated content applications. By decoupling storage from compute resources, Kubernetes simplifies the management of stateful applications. PVs are created by an administrator, and they can be dynamically provisioned based on storage classes, allowing developers to request storage via Persistent Volume Claims (PVCs). This ensures not only data durability but also ease of management in cloud-native applications.
Examples
- Using Amazon EBS as a Persistent Volume for a PostgreSQL database in a Kubernetes cluster, ensuring data integrity.
- Leveraging Amazon S3 as a backing store for a Persistent Volume to manage large datasets for a data analysis application.
Additional Information
- Persistent Volumes can be statically or dynamically provisioned based on the requirements of the application.
- Kubernetes supports multiple access modes for Persistent Volumes, such as ReadWriteOnce, ReadOnlyMany, and ReadWriteMany, providing flexibility in how storage can be accessed.