Since some Yocto releases, DNF is the default package manager for installing packages in the DUT (target machine).  The [https://en.wikipedia.org/wiki/DNF_(software) Dandified Packaging Tool (DNF)] performs runtime package management of RPM packages. In order to use DNF for runtime package management, you must perform an initial setup on the target machine for cases where the PACKAGE_FEED_* variables were not set as part of the image that is running on the target.  This application note details how to use [https://dnf.readthedocs.io/en/latest/index.html DNF ] for installing packages with a Yocto based root file system