Stuart McGraw writes:
I made a mistake when I installed my Fedora 21 system -- I specified a /boot partition size of 200MB rather than the recommended 500MB -- and didn't notice my mistake until I had too much time invested in the install to redo it to correct the size. (I am using plain vanilla ext4 partitions not lvm). When I tried to do a yum upgrade today (which includes a new kernel) it failed with a message that my boot partition space was short by 6MB. What can I do to fix or mitigate this problem? There are currently 3 kernels and a forth (the biggest) with "rescue" in its name. Do I need that if I create a rescue CD to boot from? Can I arrange things to keep only one extra kernel instead of two? How?
Your only practical option is to remove the oldest kernel, which should allow you to update, and change the installonly_limit setting in /etc/yum.conf
Unless your /boot partition is the physically last one on your hard drive, which is unlikely, reformatting and reinstalling is pretty much the easiest way to rearrange your partitions, and give /boot enough space. It is also possible to do this if one was actually using RAID-1 across two disks, but, of course, that means nothing to you.
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