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Add missing sed in-place flag (#1) 
* Add missing sed in-place flag

* Update README to warn passwordless users
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Fedora-CoreOS-Ignition

Ignition configurations for Fedora CoreOS

Notes

  1. These are the configs I personally use on my systems. You MUST edit the files before you use them. At the very least, you should add your SSH keys or password hash.
  2. If you create a passwordless user that requires administrative privileges, ensure that it is part of the sudo group (CoreOS allows this group to use sudo without a password) as the configs will disable empty password system authentication.
  3. These configurations are made with a VPS in mind. You should adapt it for a bare metal deployment if that is what you are using (adding additional kernel parameters, configuring drive encryption, configuring storage, etc). You should also change the tuned profile from virtual-guest appropriately.
  4. In most of these configs, the timezone is set to America/New_York and the automatic reboot time is set at 12 AM on Sunday. Watchtower will kick in 5-10 minutes after the reboot to update and redeploy the containers. You should change it according to your needs. The Docker-Compose.yml file does not include Watchtower.
  5. The auto-updater.service could be put in /etc/systemd/system and enable to have automatic updates for your docker-compose and its containers. Please make sure that the WorkingDir is appropriate.