CoreOS Container Linux Alternatives
Yes, it’s true.
Six years since the first CoreOS release, our favorite container-optimized operating system is reaching end-of-life.
So what's next?
CoreOS End-of-Life: Key Dates
Clearly, if you are using CoreOS today, or are looking for a container-optimized Linux, you need to make a plan. But what are your options? Let's look at the alternatives and the facts you need to make that plan, depending on your use case and needs. Check out the leading CoreOS Container Linux alternatives below, or jump straight to our summary and conclusion.
So what options are available to you?
Fedora CoreOS
Fedora CoreOS is Red Hat’s official successor to CoreOS Container Linux. However, it is not a simple continuation of the original CoreOS: it is rather a merging of the former Red Hat Atomic Host with CoreOS Container Linux, with some key differences you should understand.
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Flatcar Container Linux
Flatcar Container Linux is a “friendly fork” of CoreOS Container Linux, so is essentially identical. Maintained by Kinvolk, a company that worked closely with CoreOS in the early days, Flatcar is so close to CoreOS that in-place updates are practically seamless.
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Red Hat Enterprise Linux CoreOS
Red Hat Enterprise Linux CoreOS (RHCOS) is Red Hat’s flagship container-optimized operating system. It is based on Fedora CoreOS, with each release subject to additional hardening/testing, and integration with OpenShift.
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AWS Bottlerocket
Bottlerocket is a new offering in the container-optimized Linux space, from Amazon Web Services (AWS). It follows a lot of the CoreOS philosophy — minimal OS for container workloads with automatic atomic updates — but is primarily targeted at AWS's EC2 environment and EKS Kubernetes offering.
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