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docs/os-deployment.md

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-# OS Deployment
-
-## Image creation steps
-
-- [Installation of Ubuntu](ubuntu-installation.md)
-  - minimal OS installation (downloads ~200 MB)
-  - Software installation (downloads ~900 MB)
-  - Optimization
-    - improve speed
-    - reduce image size
-    - reduce power (CPU) & memory usage
-    - reduce surface of attack
-    - reduce bandwidth usage
-  - Customization
-    - machine-dependent (drivers, bug workarounds...)
-    - time zone of the school
-    - school scripts
-  - Cleaning
-    - logs
-    - temporary files
-    - histories
-    - caches
-    - auto-generated IDs
-- Preparation of the disk image
-  - zero unallocated space of filesystem (~7 GB of data remains)
-  - (optional) create compressed image with [lz4](https://lz4.github.io/lz4) (the resulting image is ~3.2 GB)
-
-## Network installation
-
-- Boot through PXE [UDPcast](http://udpcast.linux.lu) which allows an efficient transfer of the disk image (using multicast or broadcast)