Essun

Essun

Essun is the mediaserver of Calafou local network. It is running Debian, the Universal Operating System. It is providing services for the people who are on the territory of Calafou.

Name space

What does "Essun" mean?

TODO

Boot sequence: What happens when you turn on the machine?

1. BIOS
   1. Here you can press F12 to choose boot device. The default is to boot the system on the hard drive. This is useful if you want to boot a rescue or install image from a pendrive, for example.
   2. Here you can press F2 to enter the BIOS configuration, but we have to find out the BIOS password. At the moment, we have no idea what is the BIOS password! We have to search how to reset this password...
2. GRUB
   1. Here you can choose to start the system as usual, or to enter rescue mode. It is also possible to modify the kernel boot parameters. This is useful if you forgot the root password and want to reset it, for example.
3. Initramfs
   1. Here cryptsetup asks for the LUKS encryption password. The password can be typed in using a keyboard connected to essun, or through SSH if your SSH keys are installed in initramfs. For the second option, use the unlock-essun.sh script.
4. Systemd
   1. The hard drives ("block devices") specified in /etc/crypttab are unlocked, usually using key files in /etc/luks/.
   2. The hard drives ("block devices") specified in /etc/fstab are mounted, such as /mnt/3t (a big hard drive for mediateca) and /mnt/mirror (a mirrored drive for services).
   3. Systemd manages the services, so when the computer starts, it tries to turn on the web server (apache2), etc.
5. System
   1. You can log in if your SSH key is installed in the system: ssh $USERNAME@essun.calafou.org (where $USERNAME is your username).