Open source cloud infrastructure automation specialist Opscode has gotten a $19.5 million C round from new backer Ignition Partners with follow-on investments from existing financiers Battery Ventures and Draper Fisher Jurvetson.

The new money means the not-yet-four-year-old start-up has seen a total of $33 million in funding. It says the round was oversubscribed.

Ignition partner and former Microsoft CFO John Connors will join the Opscode board.

CEO Mitch Hill said the start-up is seeing rapid enterprise adoption and attracting Fortune 500s at an "unprecedented rate for a company at our stage."

The money is earmarked for the expansion of Opscode's software engineering, sales, marketing and business development efforts. It expects the underwriting will let it advance the innovation curve in cloud infrastructure automation and dramatically expand its market opportunity.

"The widespread adoption of scale-out IT infrastructure, including virtualization and cloud computing, has created significant IT complexity and a skills shortage in the enterprise. While today's next-generation technologies have made accessing vast compute resources as easy as swiping a credit card, they have also created new challenges in managing these complex IT environments, requiring both new skills and solutions for managing and automating infrastructure."

It expects to be hiring and to go to Europe.