It's unlikely that hordes of VMware, Citrix or Microsoft Hyper-V users will flock to open-source virtualization or cloud-computing platform as an alternative to the hypervisors and virtualized infrastructure-management software they've already chosen, analysts say. So where does open source fit in the cloud world? Think lock-in and migration flexibility.
Cloud computing customers will want to investigate open-source cloud software for the same reason they are eager to have cloud- interoperability standards developed -- to help them avoid being locked in to a single cloud vendor and to make it easier to integrate apps, virtual machines or other elements from external clouds or those of its business partners, says James Staten, vice president and principle analyst at Forrester.
More intriguing: There's a good possibility the introduction of a second major open-source cloud product, CloudFoundry, from the leading proprietary cloud vendor, VMware, indicates there will be a major structural change in the market for cloud computing that will make cloud services viable while cloud software becomes a commodity, says Chris Wolf, research VP at Gartner.
Announced on April 12, VMware's CloudFoundry platform, an open-source platform-as-a-service (PaaS) product, aims to give developers an easy way to deploy applications without worrying about the underlying infrastructure.
CloudFoundry runs on top of VMware's proprietary vSphere virtualization software, but isn't locked into the same licensing structures. VMware will sell a proprietary version, and host or license others to host public proprietary versions of CloudFoundry, but will also offer the source code to customers wanting to develop their own PaaS platform, according to a blog announcing the product from VMware CTO Steve Herrod.
It's still very VMware-centric, and its open-source credibility has yet to be demonstrated, but an "Open PaaS" offering based on the open-source Apache applications, Hyperic, Groovy and Grails products that VMware bought along with SpringSource expand the development environment and migration options for its customers, Wolf says.
CloudFoundry will natively run apps built in Spring for Java, Rails and Sinatra for Ruby and Node as well as other Java frameworks.
OpenStack and the Migration Angle
The other major open-source alternative is OpenStack, an open-source cloud platform built for NASA by Rackspace, which combined its proprietary products with NASA's previous development on a cloud system.
OpenStack is available as open source from the Openstack project as well as in proprietary, better-supported editions from Rackspace and from Cloud.com, which offers a part open, part-proprietary set of services called CloudStack. Cloud.com's version includes interfaces designed to connect its clouds with Amazon's EC2 and supports hypervisors from VMware, Citrix and the open-source KVM.
All those options make it more likely customers will be able to move applications, data and virtual machines from one cloud to another if they decide to change service providers or platform vendors, but not a lot more likely, Staten says.
Both interoperability standards and open-source platforms define too little about an application's requirements, connectivity and security to provide a smooth transition, and likely won't for at least a couple of years, Staten says.
Cloud Foundry does open the PaaS market by adding a big player that supports more than the .NET applications Microsoft's Azure does, Wolf says. But it also sets the stage for a big shakeup in the cloud-computing market.
VMware's Tricky Competitive Balance
VMware has had to maintain a careful competitive balance for years among the hosting providers to whom it both supplies software and potentially competes with in the services market, and with its parent company EMC, which partners closely with VMware's biggest competitors -- Microsoft and Citrix.
CloudFoundry software and the plan to offer it as a service upsets that balance by pushing VMware squarely into the service-provider market, which could drive a wedge between it and its biggest customers, Wolf says.
That could splinter the market for cloud software -- about three-quarters of which runs on VMware products -- as those former partners look for less-conflicted arrangements.
It could also signal that VMware executives see the cloud market consolidating in the near future as virtualization functions become more common and developers like VMware face a bigger challenge in making products customers are willing to buy separately from their operating systems. That's why it took over management of the low-cost cloud-based Mozy online storage service from EMC, Wolf says.
"Virtualization at the most basic level is a function at the level of the operating system and VMware is competing against an operating-system company," Wolf says. "It's ahead now but won't always be able to stay that way, so it has to move toward providing the infrastructure itself as well. Cloud Foundry and Mozy are a way to set itself up as more than just a software provider."