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# OS Deployment
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## Image creation steps
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Refactor & Beautify & destruction commit
return early, remove else branches, reorder conditions and top-level functions, remove empty lines, remove unnecessary append(), fix typos, stop using testing package, remove dead code, fix mistakes in subjects, tests and solutions, remove disclaimers, reformat comments, simplify solutions, tests, add more instructions to subjects, remove obsolete files, etc.
Some of the reasons behind those modifications will be added to good-practices.en.md
Some of the exercises are now broken, they will have to be fixed, most of them have a "TODO:" comment.
5 years ago
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- [Installation of Ubuntu](ubuntu-installation.md)
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- minimal OS installation (downloads ~200 MB)
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- Software installation (downloads ~900 MB)
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- Optimization
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- improve speed
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- reduce image size
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- reduce power (CPU) & memory usage
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- reduce surface of attack
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- reduce bandwidth usage
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- Customization
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- machine-dependent (drivers, bug workarounds...)
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- time zone of the school
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- school scripts
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- Cleaning
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- logs
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- temporary files
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- histories
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- caches
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- auto-generated IDs
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- Preparation of the disk image
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- zero unallocated space of filesystem (~7 GB of data remains)
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- (optional) create compressed image with [lz4](https://lz4.github.io/lz4) (the resulting image is ~3.2 GB)
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## Network installation
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Refactor & Beautify & destruction commit
return early, remove else branches, reorder conditions and top-level functions, remove empty lines, remove unnecessary append(), fix typos, stop using testing package, remove dead code, fix mistakes in subjects, tests and solutions, remove disclaimers, reformat comments, simplify solutions, tests, add more instructions to subjects, remove obsolete files, etc.
Some of the reasons behind those modifications will be added to good-practices.en.md
Some of the exercises are now broken, they will have to be fixed, most of them have a "TODO:" comment.
5 years ago
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- Boot through PXE [UDPcast](http://udpcast.linux.lu) which allows an efficient transfer of the disk image (using multicast or broadcast)
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