San Francisco-based PaaS provider DotCloud has acquired Duostack, another San Francisco PaaS provider, for an undisclosed sum. Duostack is a start-up which offers support for the non-SQL MongoDB database as part of its offering – a feature that will be integrated with DotCloud’s own product. Duostack founder and CEO David Chen will join DotCloud.

From an official release:

“DotCloud’s overall mission will be further reinforced with David and the Duostack developer community coming on board. And, with support for MongoDB, our collective users will see immediate benefits from this acquisition,” said Solomon Hykes, CEO of DotCloud. “

In addition to broadening its database support, the Duostack acquisition also extended DotCloud’s customer base. Existing users of Duostack will be migrated to DotCloud in a matter of weeks, according to the company.

This acquisitions is a big advancement for DotCloud, and comes a couple months after a hefty round of funding. The company secured $10 million from Benchmark Capital and Trinity Ventures.

Companies all throughout the cloud have been making acquisitions lately to extend their portfolios, and consequently sales figures. One the most recent example is the Citrix-Kaviza deal. The latter is a maker of VDI solutions for SMBs, and its offering represents a milestone extension to Citrix’s XenDesktop VDI lineup, designed solely for enterprise customers. The deal represents a major milestone for Citrix, which now has a desktop virtualization offering available to a whole new market segment.

VMware also made a similar acquisition lately, and recently announced it has entered into a definitive agreement to acquire Shavlik, a developer of SMB-fitted SaaS management solutions. The two companies already had a strong partnership centered around a joint offering.