Vitual machines not running after kernel upgrade
 

System: Red Hat Enterprise Linux (v. 5 for 64-bit x86_64)
with 1 virtual machine server and this one has 4 virtual machines


Updated: through Red Hat network.

(Bare with me, im not the administrator of the server, but we are so screwed right now, so need help :))

After an update through the rhn interface, the 4 vm stopped responding to the vmserver. Basicly it just says the network is not responding. The WMserver responds without any problem.

Any advice?

(sorry im doing my best to describe the problem)

RE: Virtual machines not running after kernel upgrade
 

I have some experience with VMWare Server - not much. I think you need to either:

1) Rollback to the previous Kernel. You can do this using GRUB. Sorry can't remember exactly how.

or

2) Run vmware-config.pl to re-compile the VMWare modules for the new kernel.

Good Luck!

Yeah, the kernel modules any of the VMs use is specific to that kernel, as it needs to be able to talk to the hardware too. Change the kernel, and you change the module's interface, making it impossible for the VM to communicate with the kernel, therefore the hardware.

As for how to do a rollback with GRUB, I would have to advise against it, but if you really need to, check to see if /boot has any of the old kernel binaries (normally something like vmlinuz-2.6.x.x, system.map-2.6.x.x, etc). Then, change the boot option in /boot/grub/menu.lst from whatever the kernel it's using to the desired on. Althogh, as I said, not recommended, especially if you don't know exactly what you're doing.

Hi
Thanks for you help so far.
We have tried the kernel rollback, that didn't solve the problem.

Regarding the re-compilation of the kernel modules:
It isn't VMware we are running, but Xen. Do any of you know, how to re-compile the modules into the kernel, is there a script? Like the one #2 refered to in VMware.

try
They should start showing bootup in virt-manager

Also to make sure it comes up after reboot