wiki:WikiStart

Version 39 (modified by dennis, 10 years ago) (diff)

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WORK IN PROGRESS

Welcome to SALI!

Here at Sara we use SystemImager to install our nodes on different types of clusters. SystemImager allows you to create a clone of your running system. This clone can than be distributed by various protocols, eg:

  • rsync
  • bittorrent
  • flamethrower

When installing an image the target system shall be booted with a kernel/initrd which contains the needed utilities for initializing a SystemImager installation. When the system is booted it will fetch the BOEL utilities. The BOEL utilites contains, eg:

  • kernel modules
  • partition utility
  • formatting utilities for ext2, ext3, xfs, ...
  • various protocols to get the image

Why SALI

Sali is created due the fact that the current initrd/kernel and BOEL utilities are outdated. The trigger was that there is no grub2 support. We thought this could be easily added, but during this process we decided to upgrade all software to the newest levels and replace some software components. The biggest hurdle was detecting of which hardware is in the system (udev). We believe that SALI is better in detecting which hardware is in the system then the SystemImager setup. The focus for this project is/was:

  • Easily create a new kernel/initrd when a new kernel is released or one of the software components is updated, eg: busybox. The SALI initrd contains all kernel modules and software utilities. In SystemImager this software is distributed as a separate package (BOEL binaries).
  • PXE installations with various protocols, see aria2:
    • rsync
    • Bittorent
    • ftp
    • http/https
    • metalink
  • Drop support for flamethrower/multicast and floppy disk support.
  • Support for the old generated SystemImager scripts. These scripts uses /etc/init.d/functions which is included in the initrd. We have added/changed a lot of functions to hide the complexity. We have reduced the code of the SystemImager scripts significantly, See Functions Documentations
  • For detailed overview of the changes read this changelog

Documentation

Visit our online documentation here:

Download

You can read the changelog here

Source code

You can browse the current code here:

Or you can check out code through subversion:

  • Release tree: svn co https://subtrac.sara.nl/oss/svn/sali/tags
  • Development tree: svn co https://subtrac.sara.nl/oss/svn/sali/trunk

Authors / Contributers

Authors

  • Bas van der Vlies
  • Dennis Stam