Administration OpenStack Project
published a study of its own audience. Among other things, the document is interesting because it allows you to explore current trends in the Iaas market, and, for example, understand which operating systems are most popular in this area.
For several years now, the server version of Ubuntu has been at the top of the list of the most popular, but compared to 2016, its popularity has fallen by 22% - if a year ago it
was used by 74% of OpenStack
users , then in 2017 only 52% turned out to be.

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If we analyze the distribution of OS popularity only among large projects (1000 cores or more), here Ubuntu also comes first, and CentOS gained serious popularity over the year. If then the second place in popularity in large infrastructures was occupied by Red Hat Enterprise Linux (21%), and CentOS had only 13%, then in the new year the situation changed dramatically - now only 10% of projects use RHEL, and CentOS has grown to 31%:
The popularity of Ubuntu in the clouds has been
spoken for several years already - since back in 2015, Amazon said that it is on this OS that Elastic Compute Cloud (EC2) works most of all, ahead of even Linux’s own development Amazon Machine Image ( AMI):

What do we have
To understand how the interests of users of cloud services differ from the needs of users of VDS, we conducted a little of our own research. Analysis of the statistics showed the following picture: Centos 7.x was the most popular with customers (more than 33% of clients use it), also more than 17% of them work with Debian 8, and Ubuntu 16 is not far behind (12.64%). Among the Microsoft operating systems in
our cloud , Windows 7 is the most popular (7.94%).

As you can see, in general, the preferences of our users are in line with global trends, but there are some differences - for example, CentOS has become the most popular OS, Ubuntu is only the second. In addition, there is a much larger percentage of the use of the OS from Microsoft.
Bonus: links and materials from King Servers :