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OpenEBS - Containerized Storage for Containers
- 1. OpenEBS Containerized storage for containers Containerization Meet, Digital Ocean, Bangalore 14-January-2017 @uma_mukkara @openebs
- 2. Persistent storage is a need for stateful applications in containers Storage should be always available (yes, always) Scalable, flexible, software defined Hybrid cloud is a reality (Multiple clouds and a Data center in your IT). Block storage but backup to S3 Orchestration of storage volumes at large scale (10,000 + ) (provisioning, scheduling among tiers, hosts, migration, backup, restore, upgrade) Storage requirements in Container world
- 3. Infrastructure and containerization Compute Networking Storage Containerized Towards containerization ? Towards containerization
- 4. Why containerization of storage? Applications Persistent storage volumes
- 5. Why containerization of storage? Applications Persistent storage volumes Upgrade each app (relaunch container).. One by one Storage upgrade ? Volumes are part of monolithic storage
- 6. Why containerization of storage? Applications Persistent storage volumes Upgrade each app (relaunch container).. One by one Storage volumes are containerized ● Storage functionality in userspace
- 7. Containerized storage Monolithic Storage Kernel iSCSI Software A Replication Snapshot Encryption B QoS & Mgmt C volume 1 volume 2 Containerized Storage Kernel (OpenEBS) volume 1 Storage Container VSM 1 Software A, B, C volume 2 Storage Container VSM 2 Software A’, B’, C Storage software is same for all volumes
- 8. OpenEBS Building blocks and integration For provisioning Exposes EBS API Building blocks Integration
- 9. OpenEBS - Containerized storage Truly non disruptive storage upgrades, at volume level Easy provisioning and connectivity via k8s (storage volume is part of k8s pod yaml config file) Easy connectivity via k8s (OpenEBS exposes AWS EBS API, connect from k8s via “awsElasticBlockStore” API ) Tier-to-anything caching. Can serve the block storage from remote storage with high performance
- 10. OpenEBS - Status Started in late 2016 Alpha state, github already has the working elements (Maya- Storage scheduler, storage containerization using docker) Currently hacking EBS API, Snap/restore to S3, flannel type networking integration Launched “Bangalore OpenEBS Meetup” group First meetup is on “25th January, 6 PM” Hiring Go warriors, k8s enthusiasts, network and file system experts, linux hackers. Contribute to design and code.
- 11. Remote Storage Local Storage OpenEBS Storage Hosts Data Storage Driver HTTPS (manage) Overview & Terminology K8s master K8s minions OpenEBS Maya master OpenEBS VSMs / Storage Pod Pod Network (Flannel*) Network (Flannel)
- 12. VSM - Storage in Containers Local Disks NAS or SAN Cloud Storage NVMe Flash Maya Storage Orchestrator Backend Containers to Persist Data (Cached, Protected) Frontend ContainersVSM / Storage Pod OpenEBS Storage Hosts Storage Data (iSCSI/TCMU) Container (Docker) Inline Replication Multiple Storage Backends
Editor's Notes
- This presentation is done at the containerization meet-up organized in Bangalore by the Digital ocean meet-up group. The presentation talks about how containers are used to provide truly non-disruptive storage upgrade capability at volume level
- Compute layer is well on track to adopt the micro services architecture. Containerization can help the other layers such as networking and storage as well. Weave works talk about containerized networking. Storage is definitely moving towards that as storage is always a bulky layer and at scale have lots of dependencies on application maintenance windows during upgrade planning.
- This slide shows the difference between applications that are containerized and storage volumes that are on top of monolithic storage.
- For any upgrade planning of applications, the maintenance windows can be planned easily. But same is not the case with storage software updates. During upgrade of monolithic storage appliance, as shown in this slide, all storage volumes are affected.
- In the containerized storage, the software updates can be done at the storage volumes level. Just like each application in compute layer is containerized, each storage volume is containerized. Now, the software maintenance for the storage layer is very simple and similar to how it is done at the compute layer
- For storage to be containerized, the storage functionality need to be containerized, which means it needs to be moved from kernel to user space. In the containerized storage model, replication, snapshotting, encryption and storage protocols (iSCSI/NBD) are moved to user land. Each storage volume is represented by one or more containers.
- OpenEBS builds containerization and orchestration using the known stable infrastructure components. For containerization, Docker is used. For block storage functionality (replication, encryption, easy connectivity to containers), Rancher longhorn is used. For the Maya orchestration platform Nomad (for clustering), consul (for cluster database) and flannel logic sans flannel db (for networking intelligence) are used. The provisioning integration is done into k8s, this means that the containerized storage volumes are provisioned right from the kubernetes along with the application containers. As amazon EBS is one of the most common storage infrastructures that the applications and orchestration systems are used to, OpenEBS exposes the AWS EBS APIs.
- This slide summarizes the OpenEBS features at a high level.
- This slide shows the dedication storage deployment model. Another model is hyper-converged model where the openebs components are deployed on the k8s minions.
- Each storage pod or a VSM consists of two or more containers. The backend store for OpenEBS can be the regular local disks, remote SAN disks or the remote cloud storage disks such as AWS EBS or Google persistence disks or even S3 disks. In case the backend storage is plain local disks, OpenEBS provides a managed services for the backend (setting up a storage pool on them using RAID, hot spare replacement etc)
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