How to upgrade safely between Red Hat Enterprise Linux X.Y and X.Z
Updated -
Do not use Anaconda to apply the update
Anaconda must be avoided when applying upgrades as much as possible as it will only use a limited set of packages to apply the updates, will ignore custom yum repositories and may in some versions not keep the old kernel.
Instead, use yum ; it will keep the old kernel and will use all your existing and configured repositories....
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