# NixOS server

This is my homeserver running NixOS. It makes heavy use of containers in order to organize processes.

## Containers

The file `host.nix` has a whole load of code which basically allows one to specify services in the `service/` directiory, which are then ran in seperate NixOS containers.

## Disk setup

* root filesystem
    - The root FS is on a 128GB SATA SSD running EXT4. (also used for vfat boot partiotion)
    - Nothing fancy, just reliable and slightly faster root.

* container storage
    - The container storage is a ZFS pool
    - Its running on a mirror configuration with 1TB disk pairs (currently one pair)
    - It has a blocksize of 1M to accomodate serving large media files (FLAC music, 4K movies, series, etc). This is deemed more important than DB performance in this application
    - It is compressed using ZFS standard LZ4 compression to save space
    - A 7 day window of snapshots are kept on the drive
    - A lot of inspiration where taken from the following sources
        - Official OpenZFS docs
        - https://jrs-s.net/2018/08/17/zfs-tuning-cheat-sheet/
        - https://wiki.nixos.org/wiki/ZFS
        - https://jrs-s.net/2015/02/06/zfs-you-should-use-mirror-vdevs-not-raidz/
        - https://openzfs.github.io/openzfs-docs/Getting%20Started/NixOS/index.html

* backups
    - Backups are made to a second pool on an external drive
    - All snapshots are sent over to this drive, and they are not deleted
    - It runs slower GZ based compression to minimize space taken
    - TODO: what do I do when this is full?