CoreOS was based on ChromeOS/Gentoo. With the Red Hat acquisition of CoreOS, it will be merged with Atomic and based on Fedora/RHEL. I think GKE's 'cos' is bas

CoreOS was based on ChromeOS/Gentoo. With the Red Hat acquisition of CoreOS, it will be merged with Atomic and based on Fedora/RHEL. I think GKE's 'cos' is based on the ChromeOS/Gentoo version of CoreOS.