CoreOS is a container-optimized Linux operating system to be used under docker/Kubernetes.
On January 30, 2018, Red Hat, Inc. announced that it is acquiring CoreOS for $250 million.
Founded in 2013, CoreOS was created with a goal of building and delivering infrastructure for organizations of all sizes that mirrored that of large-scale software companies, automatically updating and patching servers and helping to solve pain points like downtime, security and resilience. Since its early work to popularize lightweight Linux operating systems optimized for containers, CoreOS has become well-regarded as a leader behind award-winning technologies that are enabling the broad adoption of scalable and resilient containerized applications.
CoreOS is the creator of CoreOS Tectonic, an enterprise-ready Kubernetes platform that provides automated operations, enables portability across private and public cloud providers, and is based on open source software. It also offers CoreOS Quay, an enterprise-ready container registry. CoreOS is also well-known for helping to drive many of the open source innovations that are at the heart of containerized applications, including Kubernetes, where it is a leading contributor; Container Linux, a lightweight Linux distribution created and maintained by CoreOS that automates software updates and is streamlined for running containers; etcd, the distributed data store for Kubernetes; and rkt, an application container engine, donated to the Cloud Native Computing Foundation (CNCF), that helped drive the current Open Container Initiative (OCI) standard.