$ cat /etc/dnf/dnf.conf
[main]
gpgcheck=1
installonly_limit=3
clean_requirements_on_remove=True
exclude=kernel
Excerpt from man dnf.conf:
installonlypkgs
list
List of provide names of packages that should only ever be
installed, never upgraded. Kernels in particular fall into this
category. These packages are never removed by dnf autoremove
even if they were installed as dependencies (see
clean_requirements_on_remove for auto removal details). The num‐
ber of kept package versions is regulated by installonly_limit.
installonly_limit
integer
Number of installonly packages allowed to be installed concur‐
rently. Defaults to 3.
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