So last thursday, we were doing normal maintenance activities, patching etc... when 2 nodes of a cluster were patched and sent down for reboot. Neither host came back online. I can access them via iLO and I keep getting sent over to a no OS found prompt and it tries to boot from PXE.
I booted to the install disk, and tried to reinstall grub with no change in behavior.
I am trying to not reinstall these hosts as they are very poorly documented, not backed up. And the setup of them is quite complex.
I am looking for any advice on how to restore these hosts to production if at all possible. Thanks.
Unbootable host after updates. Not even getting to grub?
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- Posts: 12
- Joined: 2014/09/23 20:59:25
Re: Unbootable host after updates. Not even getting to grub?
Boot from the install media in rescue mode and get it to mount the system partitions for the installed system under /mnt/sysimage and explore there.
The future appears to be RHEL or Debian. I think I'm going Debian.
Info for USB installs on http://wiki.centos.org/HowTos/InstallFromUSBkey
CentOS 5 and 6 are deadest, do not use them.
Use the FAQ Luke
Info for USB installs on http://wiki.centos.org/HowTos/InstallFromUSBkey
CentOS 5 and 6 are deadest, do not use them.
Use the FAQ Luke
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- Posts: 12
- Joined: 2014/09/23 20:59:25
Re: Unbootable host after updates. Not even getting to grub?
Been there, done that, bought the T shirt. The big issue is, these are UEFI hosts, and documentation on reinstalling grub on UEFI is a bit sketchy... Been looking, but no joy.
Re: Unbootable host after updates. Not even getting to grub?
Yes but you need to mount the partitions to look at what's there. For a start is there anything there at all? Is the disk still partitioned? Does it recognise any LVM LVs? Can you run fdisk -lu /dev/sd[a-z] and post the results?
The future appears to be RHEL or Debian. I think I'm going Debian.
Info for USB installs on http://wiki.centos.org/HowTos/InstallFromUSBkey
CentOS 5 and 6 are deadest, do not use them.
Use the FAQ Luke
Info for USB installs on http://wiki.centos.org/HowTos/InstallFromUSBkey
CentOS 5 and 6 are deadest, do not use them.
Use the FAQ Luke