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1.2.1 Configuring Software Channels Using ULN

Spacewalk contains a ULN plug-in for the spacewalk-repo-sync tool. The plug-in enables you to synchronize ULN channels directly into Spacewalk channels without requiring the Spacewalk server to be registered with ULN.

To configure the ULN plug-in, edit the /etc/rhn/spacewalk-repo-sync/uln.conf file and add login credentials for ULN. By default, this file is read-only by root.

username = <ULN SSO username> 
password = <ULN SSO password>

After you edit the configuration file, ensure that the file permissions are read-only (0400) by root. This is an important security step to protect the ULN credentials.

Once the ULN plug-in is configured, you create the Spacewalk software channels and repositories in the normal way using the Spacewalk web interface. When you specify the URL for a ULN repository, use a URL in the following format:

uln:///<ULN channel label>


The URL must contain three forward slash (/) characters. For example:


You can get a list of available ULN channel labels by logging in to ULN ( and selecting the Channels tab.