According to the Cloud Market which looked at operating systems on the Amazon Elastic Compute Cloud (EC2), Ubuntu has approximately 135,000 instances. In second place is Amazon’s own Amazon Linux Amazon Machine Image (AMI), with 54,000. Windows is third with 17,600 instances.
By dominating AWS, Ubuntu is the most popular cloud Linux.
Ubuntu has been available on HP Cloud, and Microsoft Azure since 2013. It’s also now available on Google Cloud Platform, Fujitsu, and Joyent.
Canonical, Ubuntu’s parent company, is also putting considerable efforts behind OpenStack for the private and hybrid cloud. Indeed, Canonical has also worked with Microsoft to bring Windows Server to OpenStack and with Oracle to bring Oracle Linux to the Ubuntu take on OpenStack.
Apparently, 53 percent of all production OpenStack clouds are running Ubuntu. CentOS is far in the back with 29 percent.