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docs: Consolidate related projects

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# Relationship with CoreOS
The CoreOS Container Linux project was very successful, spawning multiple projects
and derivatives that continue to see widespread use today.
An aim of this project is to share code and logic with Fedora CoreOS and its derivatives,
such as Red Hat Enterprise Linux CoreOS. At the current time, these systems continue
to exist and success for this project will include sharing as much code as possible
with them.

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See [install.md](./install.md). See [install.md](./install.md).
## Differences from Fedora CoreOS
Fedora CoreOS today is not small; there are multiple reasons for this, but
primarily because it was created in a pre-bootable-container time. Not everyone
wants e.g. moby-engine.
But going beyond size, the images produced by this project will focus
on a container-native flow. We will ship a (container) image that does not
include Ignition for example.
## Differences from RHEL CoreOS
We sometimes say that RHEL CoreOS
[has FCOS as an upstream](https://github.com/openshift/os/blob/master/docs/faq.md#q-what-is-coreos)
but this is only kind of true; RHEL CoreOS includes a subset of FCOS content,
and is lifecycled with OCP.
An explicit goal of this project is to produce bootable container images
that can be used as *base images* for RHEL CoreOS; for more on this, see e.g.
<https://github.com/openshift/os/issues/799>
## Differences from RHEL for Edge
It is an explicit goal that CentOS boot also becomes a "base input" to RHEL for Edge.
## Understanding "tiers" ## Understanding "tiers"
There is a "tier-0" image, but it is not yet being automatically built. The "tier-0" There is a "tier-0" image, but it is not yet being automatically built. The "tier-0"

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# Relationship with other projects
## Fedora CoreOS
The primary focus of Fedora CoreOS is on being a "golden image" that
can be configured via Ignition to run containers. In the Fedora CoreOS
model, the OS is "lifecycled" separately from the workload and configuration.
This project is explicitly designed to be derived from via container
tooling, not Ignition. While we will support a "just run the golden image" flow,
ading and customizing the base image with extra packages and content is the expected
norm. An important corrollary to this is that OS updates are "lifecycled" with the
workload and configuration.
## RHEL CoreOS
We sometimes say that RHEL CoreOS
[has FCOS as an upstream](https://github.com/openshift/os/blob/master/docs/faq.md#q-what-is-coreos)
but this is only kind of true; RHEL CoreOS includes a subset of FCOS content,
and is lifecycled with OCP.
An explicit goal of this project is to produce bootable container images
lifecycled with the base OS, that can be used as *base images* for RHEL CoreOS.
For more on this, see e.g.
<https://github.com/openshift/os/issues/799>
## RHEL for Edge
It is an explicit goal that CentOS boot also becomes a "base input" to RHEL for Edge.