In traditional file management, you would be required to upload and distribute each file
separately, even if the distinction is nominal and the number of variations is in the hundreds or
thousands. RHN addresses this by allowing the inclusion of macros, or variables, within the
configuration files it manages for Provisioning-entitled systems. In addition to variables for
custom system information, the following standard macros are supported:
• rhn.system.sid
• rhn.system.profile_name
• rhn.system.description
• rhn.system.hostname
• rhn.system.ip_address
• rhn.system.custom_info(key_name)
• rhn.system.net_interface.ip_address(eth_device)
• rhn.system.net_interface.netmask(eth_device)
• rhn.system.net_interface.broadcast(eth_device)
• rhn.system.net_interface.hardware_address(eth_device)
• rhn.system.net_interface.driver_module(eth_device)
To use this powerful feature, either upload or create a configuration file through the
Configuration Channel Details page. Then, open its Configuration File Details page and
include the supported macros of your choosing. Ensure that the delimiters used to offset your
variables match those set in the Macro Start Delimiter and Macro End Delimiter fields and do
not conflict with other characters in the file. The delimiters must be two characters in length and
cannot contain the percent (%) symbol.
As an example, you may have a file applicable to all of your servers that differs only in IP
address and hostname. Rather than manage a separate configuration file for each server, you
may create a single file, such as
server.conf
, with the IP address and hostname macros
included, like so:
hostname={@ rhn.system.hostname @}
ip_address={@ rhn.system.net_interface.ip_address(eth0) @}
Upon delivery of the file to individual systems, whether through a scheduled action in the RHN
website or at the command line with the Red Hat Network Configuration Client
(
rhncfg-client
), the variables will be replaced with the hostname and IP address of the
system, as recorded in RHN's System Profile. In the above configuration file, for example, the
Chapter 6. Red Hat Network Website
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Summary of Contents for NETWORK SATELLITE 5.1.0 - CHANNEL MANAGEMENT
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