An anonymous reader quotes a report from ZDNet: One reason Ubuntu is increasing its lead is that Jujo, Canonical's application modeling and deployment DevOps tool, has been gaining in popularity. In the latest OpenStack user survey, we see that OpenStack is finally gaining real momentum in private clouds. We also see that Ubuntu Linux is continuing to dominate OpenStack. As Canonical cloud marketing manager Bill Bauman said, "Ubuntu OpenStack continues to dominate the majority of deployments with 55 percent of production OpenStack clouds. The previous survey showed Ubuntu OpenStack at 33 percent of production clouds. Ubuntu has seen almost 67 percent growth in an area where Ubuntu was already the market leader. These numbers are a huge testament to the community support Ubuntu OpenStack receives every day." The Cloud Market's latest analysis of operating systems on the Amazon Elastic Compute Cloud (EC2) shows Ubuntu with just over 215,000 instances. Ubuntu is followed by Amazon's own Amazon Linux Amazon Machine Image (AMI), with 86,000 instances. Further back, you'll find Windows with 26,000 instances. In fourth and fifth place, respectively, you'll find Red Hat Enterprise Linux (RHEL) with 16,500 instances and then CentOS with 12,500 instances.