CoreOS Installation on a Hetzner Server
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• log into the rescue system

  ssh root@{sever-ip}

• run installimage

  • choose “Other” -> “CoreOS-XXX”
  • set the hostname
  • keep the remaining defaults in install.conf (you may have to quit with ESC 0, if F10 does not work)
  • confirm deletion of partitions

Beware: Contrary to the output info installimage does not create a software raid. CoreOS is installed on /dev/sda, /dev/sdb remains unpartitioned.

• adjust CoreOS configuration

  • mount ROOT partition

    mount /dev/sda9 /mnt

  • add keys to /mnt/home/core/.ssh/authorized_keys

  • disable root and password logins

    echo "PermitRootLogin no" > /mnt/etc/ssh/sshd_config
    echo "PasswordAuthentication no" >> /mnt/etc/ssh/sshd_config
    

  • remove user and sshd entries from coreos-install (to make above changes permanent between reboots)

    cp /mnt/var/lib/coreos-install/user_data /mnt/var/lib/coreos-install/user_data~
    sed -i '/users:/,$d' /mnt/var/lib/coreos-install/user_data
    

• reboot into CoreOS

  reboot

• log into CoreOS

  ssh core@{sever-ip}

The docker systemd service is not enabled by default, but we need it to restart docker services after a reboot:

`sudo systemctl start docker.service`
`sudo systemctl enable docker.service`

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