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Yum kernel upgrades don't boot

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It appears the when a kernel upgrade is applied by yum, the rebuild of grub2.conf seems to reset the kernel command lines to default, dropping options to use working video and network drivers and stable clocks. Even the vital "nomodeset" option is dropped from the old stanzas in the original grub2.config.

Is this part of the war on using vendor drivers? Booting into a system with an unstable clock, no video even text in runlevel 3, and no working network doesn't make a upgrade easy.

So is dropping the kernel command line options a bug, or deliberate policy?

posted May 19, 2013 by anonymous

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2 Answers

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Neither. When you install a new kernel, the file is rebuilt, using /etc/default/grub as a template. If you need to add something permanently, you need to add it there.

answer May 19, 2013 by anonymous
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It's actually not. ;) Kernel updates don't run grub2-mkconfig, they use grubby which just copies the last existing entry.

It should re-use the options from the previous top existing kernel. Did you have those options in that kernel entry?

answer May 19, 2013 by anonymous
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