I am running Fedora 21 right now and it happens that fedora has an official upgrade tool called fedup. Install fedup by:
#yum install fedup
I'm using fedup for the first time since using Fedora Core. So I started by:
#yum update fedup fedora-release
to update the existing system.
Then start fedup by:
#fedup --network 22
which tells fedup to create the necessary repo links to fedora 22 and the boot image.
What's so special about my case is that my Internet connectivity is limited by a data cap. I know that I won't be able to run fedup in one sitting. So I had to stop the upgrade process along the way and continue the next day. fedup is happening in the terminal. So just stop the process and fedup remembers where to continue.
So far no glitches, no problems in the logs.
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