OpenEBS - Cloud Native Storage

Overview

OpenEBS is an open-source Container Native Storage solution that provides persistent storage for Kubernetes workloads. It enables dynamic provisioning of storage resources using containerized storage controllers, making it highly flexible and cloud-native. OpenEBS supports various storage engines, including LocalPVs for direct node storage and Replicated PV advanced data replication and resilience. It is designed to integrate seamlessly with Kubernetes, offering benefits like storage policies, resize, thin-provisioning, snapshots, and restore capabilities, making it an ideal choice for stateful applications.

OpenEBS offers two primary storage approaches for Kubernetes workloads: Local Storage and Replicated Storage. Below is a comparative overview:

Feature	Local Storage	Replicated Storage
Data Availability	Limited to the node where the volume is provisioned; not suitable for high-availability requirements.	Synchronously replicates data across multiple nodes, ensuring high availability and durability.
Use Cases	Ideal for applications managing their own replication and availability, such as distributed databases like MongoDB and Cassandra.	Suitable for stateful workloads requiring storage-level replication and high availability, like Percona/ Standalone DBs, and GitLab.
Performance	Provides near-disk performance with minimal overhead.	Designed for high performance, leveraging NVMe-oF semantics for low-latency access.
Limitations	Not highly available; node failure leads to data unavailability.	Requires sufficient resources (CPU, RAM, NVMe) for optimal performance.
Snapshot and Cloning	Supported when backed by advanced filesystems like LVM or ZFS.	Supported, providing enterprise storage capabilities.
Backup and Restore	Supported via Velero, using Restic for local volumes.	Supported via Velero, ensuring data protection and recovery.

In summary, Local Storage is a good choice when your application can manage its own replication and high availability, and Replicated Storage when you require storage-level replication, enhanced data durability and network-based storage access.

Below are the sub-projects or the major storage solutions under the OpenEBS Umbrella. Visit the individual repositories to learn more about their usage and architecture.

Sub-Project	Local PV Hostpath	Local PV ZFS	Local PV LVM	Local PV Rawfile (Experimental)	Mayastor
Type	Single-node	Single-node	Single-node	Single-node	Multi-node
What is it for?	Replacement for in-Tree Kubernetes CSI Hostpath	Storage engine for ZFS managed backend storage	Storage engine for LVM2 managed backend storage	Experimental engine for using an extent file as block storage	General purpose replicated enterprise storage
Designed for	Developers or DevOps	ZFS users and production deployments	LVM2 users and production deployments	Developers	Enterprises and production deployments
Features	Everything in Kubernetes Hostpath, plus: - Dynamic provisioning, Zero configuration, No CSI driver	Provision ZFS datasets, Provision ZFS volumes, Dynamic provisioning, ZFS resilience, ZFS RAID protection, CSI driver	Provision LVM2 volumes, Dynamic provisioning, LVM2 RAID protection, CSI driver	Provision file system from local files as persistent volumes, CSI driver	Replicated storage NVMe / RDMA, Snapshots, Clones, High availability, CSI driver
Status	Stable, deployable in PROD	Stable, deployable in PROD	Stable, deployable in PROD	Beta, undergoing evaluation & integration	Stable, deployable in PROD
Current Version				release v0.80

Why OpenEBS?

OpenEBS offers several compelling advantages for managing storage in Kubernetes environments:

Cloud-Native Architecture: Designed as a cloud-native solution, OpenEBS integrates seamlessly with Kubernetes, most of the storage engines are CSI compliant.
Solutions for wide range of workloads: Solutions for both workloads which need or may not need replication.
Avoidance of Cloud Lock-In: By abstracting storage management, OpenEBS facilitates the movement of data across various Kubernetes environments, whether on-premises or in the cloud, thereby reducing dependency on a single cloud provider.
Cost Efficiency: With features like thin provisioning OpenEBS enables dynamic allocation of storage resources, potentially reducing storage by preventing overprovisioning and allowing for on-the-fly storage expansion.
High Availability with Lower Blast Radius: OpenEBS enhances application resilience by synchronously replicating data across multiple nodes, ensuring high availability. In the event of a node failure, only the data on that specific node is affected, minimizing the impact on the overall system.

These features make OpenEBS a robust and flexible solution for managing persistent storage in Kubernetes environments.

Documents

Community

Homepage: openebs.io
Maintainers' email: openebs-team@googlegroups.com
Slack:
- #openebs
- #openebs-dev
Twitter: @openebs
Community Meeting: OpenEBS holds a monthly community meeting via Zoom on the last Thursday of the month, at 14:00 UTC.
- Add to calendar
Community Meeting Recordings: Youtube

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License Compliance

OpenEBS is a CNCF Sandbox Project

License

gogo-aiai/openebs

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