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.<br/>
2. Only ED25519 SSH keys are accepted with the SSHD hardening configuration. If you do not use ED25519 keys, you will need to adjust the `/etc/ssh/sshd_config.d/10-custom.conf` file accordingly.
3. 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.
4. 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.
5. In most of these configs, the timezone is set to `America/Phoenix` and the automatic reboot time is set at 12 AM on Sunday. You need to be mindful of timezones with Daylight Savings per [Zincati documentation](https://coreos.github.io/zincati/usage/updates-strategy/).
6. The docker-compose-updater.service in `/etc/systemd/system` can be enabled to have automatic updates for your containers created by Docker Compose. Please make sure that the `WorkingDirectory` is appropriate.
# Upgrading from Fedora CoreOS 39 to 40
I am aware of a dependency issue which may cause the system to not automatically update itself to FCOS 40. To fix the problem, run:
