This has been called the age of DevOps and operating systems seem to be getting a little bit less attention than tools are. However this doesn8217t mean that there has been no innovation in operating systems. Edit The diversity of offerings from the plethora of distributions based on the Linux kernel is a fine example of this. Fedora CoreOS has a specific philosophy of what an operating system should be in this age of DevOps. .
Fedora CoreOS FCOS came from the merging of CoreOS Container Linux and Fedora Atomic Host. It is a minimal and monolithic OS focused on running containerized applications. Security being a first class citizen FCOS provides automatic updates and comes with SELinux hardening.
For automatic updates to work well they need to be very robust. The goal being that servers running FCOS won8217t break after an update. This is achieved by using different release streams stable testing and next. Each stream is released every 2 weeks and content is promoted from one stream to the other next -gt testing -gt stable. That way updates landing in the stable stream have had the opportunity to be tested over a long period of time.