Polly is still considered work in progress. We will have a first release shortly.
Polly
implements a centralized storage scheduling service that integrates with popular container schedulers
of different application platforms for containerized workloads. It is an open source framework that supports use of external storage, with scheduled containerized workloads, at scale. It can be used to centralize the control of creating, mapping, snapshotting and deleting persistent data volumes on a multitude of storage platforms.
- Centralized control and distribution of storage resources
- Offer based mechanism for advertising storage to container schedulers
- Framework supporting direct integration to any container scheduler, storage orchestrator, and storage platform
Container runtime schedulers need to be integrated with every aspect of available hardware resources, including persistent storage. When requesting resources for an application the scheduler gets offers for CPU, RAM and disk.
To be able to offer persistent storage in a scalable way, the application and container scheduler needs awareness of the available resources from the underlying storage infrastructure.
- An application requires highly available storage with a specific set of policies applied
- The scheduler receives a request to start the application
- The scheduler checks with Polly or already has an off from Polly for storage resources
- Polly requests the volume(s) to be mapped to the container
- Scheduler issues request to start the container with persistent storage
- Container runtime orchestrates process of starting container and attaching persistent storage
Polly provides an open framework to enable integration to any container, cloud, or storage platform.
Container runtime schedulers:
- Docker Swarm
- Mesos
- Kubernetes
- Cloud Foundry
Cloud platforms:
- AWS EC2 (EBS)
- Google Compute Engine
- OpenStack
- Private Cloud
- Public Cloud (RackSpace, and others)
Planned supported storage platforms:
- EMC ScaleIO
- XtremIO
- VMAX
- Isilon
- Others
- VirtualBox
The following command will install Polly. If using
CentOS
, RedHat
, Ubuntu
, or Debian
the necessary service manager is used
to bootstrap the process on startup.
curl -sSL https://dl.bintray.com/emccode/polly/install | sh -
Polly makes use of the open source storage plugin framework libStorage to enable storage orchestrator tools and container runtimes to make requests of storage. Any storage platform that has a driver implementation for the libStorage framework will work with Polly.