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1.3.4. Including Macros in Configuration Files

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. Red Hat Satellite 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 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. We recommend that the delimiters be two characters in length and must not 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) |}
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Upon delivery of the file to individual systems, whether through a scheduled action in the Red Hat Network 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 the Satellite's System Profile. In the above configuration file, for example, the deployed version resembles the following: 
hostname=test.example.domain.com
ip_address=177.18.54.7
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To capture custom system information, insert the key label into the custom information macro (rhn.system.custom_info). For instance, if you developed a key labeled "asset" you can add it to the custom information macro in a configuration file to have the value substituted on any system containing it. The macro would look like this: 
asset={@ rhn.system.custom_info(asset) @}
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Upon deployment of the file to a system containing a value for that key, the macro gets translated, resulting in a string similar to the following: 
asset=Example#456
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To include a default value, for instance if one is required to prevent errors, you can append it to the custom information macro, like so: 
asset={@ rhn.system.custom_info(asset) = 'Asset #' @}
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This default is overridden by the value on any system containing it.
Using the Red Hat Network Configuration Manager (rhncfg-manager) will not translate or alter the files, as that tool is system agnostic. rhncfg-manager does not depend on system settings.

Note

This features only inserts macros into text files. Binary files cannot be interpolated.
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