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Snippets

For more information, refer to https://fedorahosted.org/cobbler/wiki/KickstartSnippets.

7.3.1. Default Snippets

There are many snippets that ship by default and may be used in kickstarts written on or uploaded to

the Satellite server. You may want to look at a template from a wizard style kickstart located in /var/

lib/rhn/kickstarts/wizard/ and see what default snippets are used and how they are used.

One of the most useful ones is redhat_register.

The redhat_register snippet can be used to register machines to a Satellite server as

part of the kickstart. It uses a special variable called redhat_management_key to register it

to the server. Simply set that variable at either the system, profile, or distro level and then add

$SNIPPET('redhat_register') to a %post section of your kickstart. Any wizard style kickstarts

that are generated by the Satellite server will already include this snippet in it's pre-made %post

section.

7.3.2. Escaping Special Characeters

Since the $ and # characters are used during templating for specifying variables and control flow, you

should not use these characters within scripts without escaping them.

So for example, if you were writing a bash script in a %post section:

%post

echo $foo > /tmp/foo.txt

The templating engine would try to find a variable named $foo and would fail if foo did not exist

as a variable. There are a few ways to escape the $ symbol so it shows up as a bash variable. The

simplest is with a backslash:

%post

echo \$foo > /tmp/foo.txt

\$foo will be rendered as $foo within the kickstart.

A second method is to wrap the entire script in #raw ... #endraw :

%post

#raw

echo \$foo > /tmp/foo.txt

#endraw

All %pre and %post scripts created using the wizard style kickstarts are wrapped with

#raw...#endraw by default. This can be toggled using the Template checkbox available when

editing a %post or %pre script.

The final method is simply by including #errorCatcher Echo in the first line of your kickstart. This

instructs the templating engine to ignore any variables that do not exist and print out the text as is.

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Red Hat SATELLITE 5.3.0 RELEASE NOTES Guida di Installazione Pagina 13