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README.md

System Initialization for CoreOS

CoreOS uses systemd for init and process management. This repo is divided into three collections of files:

  • configs: Customized daemon configuration files, usually installed into /etc but really the sky is the limit there.
  • scripts: Helper scripts for init and service startup. These are generally to be used as systemd oneshot services and installed into /usr/lib/coreos.
  • systemd: Unit files for mount points, our helper scripts, or other services that don't install their own unit files.

The coreos-base/coreos-init ebuild handles the install process.

Important Steps

A few notes on things that must happen which are unique to CoreOS.

  • resize btrfs: Support easy VM growth by checking if there is unused space at the end of the disk and expanding the filesystem to use it.
  • mount /: This directory can be completely empty.
  • initialize /: The / partition can be completely formatted by the user. Run systemd-tmpfiles to set everything up into a known state.
  • mount /usr: The entire distro lives in this directory.
  • mount /usr/share/oem: If an OEM is available on disk make sure it gets mounted here.
  • generate ssh keys: The stock sshd units do not handle this so we need to.

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