7.10. Extending the Discovery Image

Procedure

1. Create the following directory structure:

   .
   ├── autostart.d
   │   └── 01_zip.sh
   ├── bin
   │   └── ntpdate
   ├── facts
   │   └── test.rb
   └── lib
       ├── libcrypto.so.1.0.0
       └── ruby
           └── test.rb

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   • The autostart.d directory contains scripts that are executed in POSIX order by the image when it starts, but before the host is registered to Satellite.
   • The bin directory is added to the $PATH variable; you can place binary files in this directory and use them in the autostart scripts.
   • The facts directory is added to the FACTERLIB variable so that custom facts can be configured and sent to Satellite.
   • The lib directory is added to the LD_LIBRARY_PATH variable and lib/ruby is added to the RUBYLIB variable, so that binary files in /bin can be executed correctly.

2. After creating the directory structure, create a .zip file archive with the following command:

   zip -r my_extension.zip .

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3. To inform the Discovery image of the extensions it must use, place your zip files on your TFTP server with the Discovery image, and then update the APPEND line of the PXELinux template with the fdi.zips option where the paths are relative to the TFTP root. For example, if you have two archives at $TFTP/zip1.zip and $TFTP/boot/zip2.zip, use the following syntax:

   fdi.zips=zip1.zip,boot/zip2.zip

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