[CentOS] lost connection during yum update

[m.roth at 5-cent.us]

Les Mikesell wrote:
> On Sun, Mar 10, 2013 at 10:45 PM, Frank Cox <theatre at melvilletheatre.com>
> wrote:
>>
>> The most maddening part of this is that all of the files and the
>> filesystems appear to be present -- I can boot off of a rescue CD and
mount the
>> whole works under /mnt/sysimage and browse to my hearts content.  I
just can't boot
>> the damn thing.
>>
>> How is a name like /dev/mapper/vg_ws195-lv_root rd_NO_LUKS determined?
>> If I knew how to read or find out what the actual name of the root
directory
>> was on the problem machines, I could compare it to what's in the grub.conf
>> file.
>
> I don't have any idea how to debug LVM stuff.  But if you can boot in
> rescue mode just on general principles I would chroot into
> /mnt/sysimage, rebuild the initrd and reinstall grub.

rd_NO_LUKS says that there are no encrypted filesystems. We *strongly*
prefer to label our filesystems.

Finally, if you can see it running via linux rescue, I'd go with Les'
thought: boot that way, chroot to /mnt/sysimage, and first do a
grub-install. If that doesn't solve it, then try the rebuild of initrd.

Oh, and check /mnt/sysimage/etc/fstab

       mark