Virtual Machine kernel Boot repair

virtual machine kernel boot repair

Failure Reason: Business feedback after a machine restarts, I can't log in. The AWS Platform Foundation Cloud VNC looked down, see the kernel error, the original business did a kernel upgrade operation. The upgraded kernel is not suitable for this system. Need to adjust back to the original kernel boot.

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1: Confirm which machine, the current instance of the fault machine is confirmed: i-23c0f47e . Virsh list to see if it is powered on, if it is turned on first.

[Email protected]_234_107 ~]# Virsh List

Id Name State

----------------------------------

0 Domain-0 Running

Ten I-10D7FDD5 no State

2: Our platform is a sub-machine disk made of logical volume

[Email protected]_234_107 ~]# LVS

LV VG Attr lsize Origin snap% Move Log copy% Convert

I-10d7fdd5.extend.file Vg_bc_local-wi-ao 89.01g

i-10d7fdd5.instance Vg_bc_local-wi-ao 18.00g

I-23c0f47e.extend.file vg_bc_local-wi-a-140.01g

i-23c0f47e.instance vg_bc_local-wi-a-18.00g

3:kpartx untie the disk and mount the first disc because the first block is the machine's/partition, mounted to the/MNT

[[Email protected]_234_107~]# kpartx-av/dev/mapper/vg_bc_local-i--23c0f47e.instance

[Email protected]_234_107 ~]# mount/dev/mapper/vg_bc_local-i--23c0f47e.instance1/mnt/

4: Make a backup before making a change, form a good habit

[Email protected]_234_107 ~]# cp/mnt/boot/grub/grub.conf/tmp/.

5: Remove the incorrect boot dd, or adjust the boot

[Email protected]_234_107 ~]# vim/mnt/boot/grub/grub.conf

Since the kernel and version are customized by the company, it is not for everyone to see, modify the correct guidance can be.

6: Restore the disk after modification, start the virtual machine

[Email protected]_234_107 ~]# kpartx-dv/dev/mapper/vg_bc_local-i--23c0f47e.instance

[[Email protected]_234_107 ~]# Virsh Create (startup script)

To summarize:

If you are a physical opportunity to this kind of problem, the incoming single user adjusts

If your virtual machine disk is using a hard disk partition, use Losetup

Operation is very simple, need to according to their own structure of the different, can be changed under

Virtual Machine kernel Boot repair