4:04 a.m.
When attempting to create a template the process fails. It has been suggested to run
virt-sysprep manually and see why it it failed. Specifically, I have an Ubuntu 20.04
machine that doesn't boot properly even if the the template process does finish
without error. I have tried creating the template several times as a test. about 80% of
the time the template creation fails outright for qemu errors. The other 20%
"appear" to work but the system boots to a grub emergency prompt
Can someone clarify the process?
I know you can run the command: virt-sysprep -d <name_of_vm>
1. Where do you run it from? The hypervisor host or the management engine?
2. What account do you need to use? What is the authentication username and password?
I also think I read somewhere that you should refrain from using root. Anything else to
know?
Anything else to try regarding the grub prompt?
Thanks.
3:33 p.m.
New subject: How to run virt-sysprep / How to troubleshoot template creation failure
On Wed, May 25, 2022 at 01:04:11AM -0000, jeremy_tourville(a)hotmail.com wrote:
When attempting to create a template the process fails. It has been
suggested to run virt-sysprep manually and see why it it failed. Specifically, I have an
Ubuntu 20.04 machine that doesn't boot properly even if the the template process does
finish without error.
I wonder if that something tells about the template itself. How did you
create the template? Did the original VM work fine?
I have tried creating the template several times as a test. about
80% of the time the template creation fails outright for qemu errors. The other 20%
"appear" to work but the system boots to a grub emergency prompt
Can someone clarify the process?
I know you can run the command: virt-sysprep -d <name_of_vm>
This works for powered off libvirt domains but is not usable in oVirt
environment.
1. Where do you run it from? The hypervisor host or the management
engine?
It's not completely trivial to run manually and may not be the best
approach (just yet). If you have NFS domains you may be able to figure
out paths to all disks of your newly created VM and run virt-sysprep on
it. If you have block storage you need to prepare the disk images first.
For start, please provide vdsm.log. You should also see a log file
for the virt-sysprep run in /var/log/vdsm/commands/, please provide that
too.
2. What account do you need to use? What is the authentication
username and password?
I also think I read somewhere that you should refrain from using root. Anything else to
know?
I beleve we run all virt-* commands as vdsm user.
Anything else to try regarding the grub prompt?
Is the template worth fixing or would it make more sense to recreate it?
If the original VM/template is broken it may explain the virt-sysprep
failures.
Tomas
Thanks.
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Tomáš Golembiovský <tgolembi(a)redhat.com>
5:09 p.m.
New subject: How to run virt-sysprep / How to troubleshoot template creation failure
Tomas, thank you for your input.
I am creating the template from a new Ubuntu VM that I have created. I have noted that
generally my centos/rocky VMs can be created from VMs without issue. It has only been
Ubuntu that is giving me grief. That being said, I only have one Ubuntu VM in my
environment that needs to be made into a template. Fix the template or recreate it makes
no difference to me. As long as the template is usable that's all that matters.
I have block storage, not NFS. You mention needing to prepare the disk images first...
how? In my experience I didn't need to do that for any centos VMs. I just clicked
make template in GUI, selected QCOW image type and seal VM option. In a few minutes
everything was done and I could use the new template.
3:11 a.m.
New subject: How to run virt-sysprep / How to troubleshoot template creation failure
I was able to gather a VDSM log. Would you still like the VDSM logs? The template
creation process seems to be working in the sense that the template always gets created.
Now my problem has changed to having trouble with the system booting to a grub prompt as
mentioned in the first post. Would the logs be of any use if the template creation
process finishes?
I don't understand why any VMs created from the template boot to the grub prompt.
2:21 p.m.
New subject: How to run virt-sysprep / How to troubleshoot template creation failure
On Sun, Jun 05, 2022 at 12:11:47AM -0000, jeremy_tourville(a)hotmail.com wrote:
I was able to gather a VDSM log. Would you still like the VDSM logs?
The template creation process seems to be working in the sense that the template always
gets created.
I don't expect to find there much if the process finishes ok, but feel
free to send it to me. You don't have to post it to the mailing list.
Now my problem has changed to having trouble with the system booting
to a grub prompt as mentioned in the first post. Would the logs be of any use if the
template creation process finishes?
I don't understand why any VMs created from the template boot to the grub prompt.
Could you please confirm that the VM that you use to create the template
works fine?
* Does the original VM boot *before* creating the template?
* Does the original VM boot *after* creating the template?
* If you clone the VM, does the clone boot?
Tomas
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Tomáš Golembiovský <tgolembi(a)redhat.com>
6:55 p.m.
New subject: How to run virt-sysprep / How to troubleshoot template creation failure
I'll send you the VDSM log.
To answer you questions:
Yes
Yes
No, the cloned VM boots to the grub prompt.
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Tomáš Golembiovský