4:07 p.m.
On Tue, Aug 3, 2021 at 7:29 PM KK CHN <kkchn.in(a)gmail.com> wrote:
I have asked our VM maintainer to run the command
# virsh -r dumpxml vm-name_blah //as Super user
But no output : No matching domains found that was the TTY output on that rhevm node
when I executed the command.
Then I tried to execute # virsh list // it doesn't list any VMs !!! ( How
come this ? Does the Rhevm node need to enable any CLI with License key or something to
list Vms or to dumpxml with virsh ? or its CLI commands ?
RHV undefine the vms when they are not running.
Any way I want to know what I have to ask the maintainer to
provide a working a working CLI or ? which do the tasks expected to do with command
line utilities in rhevm.
If the vm is not running you can get the vm configuration from ovirt
using the API:
GET /api/vms/{vm-id}
You may need more API calls to get info about the disks, follow the <links>
in the returned xml.
I have one more question : Which command can I execute on an rhevm
node to manually export ( not through GUI portal) a VMs to required format ?
For example; 1. I need to get one VM and disks attached to it as raw images. Is
this possible how?
and another 2. VM and disk attached to it as Ova or( what other good format) which
suitable to upload to glance ?
Arik can add more info on exporting.
Each VMs are around 200 to 300 GB with disk volumes ( so where
should be the images exported to which path to specify ? to the host node(if the host
doesn't have space or NFS mount ? how to specify the target location where the VM
image get stored in case of NFS mount ( available ?)
You have 2 options:
- Download the disks using the SDK
- Export the VM to OVA
When exporting to OVA, you will always get qcow2 images, which you can later
convert to raw using "qemu-img convert"
When downloading the disks, you control the image format, for example
this will download
the disk in any format, collapsing all snapshots to the raw format:
$ python3 /usr/share/doc/python3-ovirt-engine-sdk4/examples/download_disk.py
-c engine-dev 3649d84b-6f35-4314-900a-5e8024e3905c /var/tmp/disk1.raw
This requires ovirt.conf file:
$ cat ~/.config/ovirt.conf
[engine-dev]
engine_url = https://engine-dev
username = admin@internal
password = mypassword
cafile = /etc/pki/vdsm/certs/cacert.pem
Nir
Thanks in advance
On Mon, Aug 2, 2021 at 8:22 PM Nir Soffer <nsoffer(a)redhat.com> wrote:
>
> On Mon, Aug 2, 2021 at 12:22 PM <kkchn.in(a)gmail.com> wrote:
> >
> > I have few VMs in Redhat Virtualisation environment RHeV ( using Rhevm4.1 )
managed by a third party
> >
> > Now I am in the process of migrating those VMs to my cloud setup with
OpenStack ussuri version with KVM hypervisor and Glance storage.
> >
> > The third party is making down each VM and giving the each VM image with their
attached volume disks along with it.
> >
> > There are three folders which contain images for each VM .
> > These folders contain the base OS image, and attached LVM disk images ( from
time to time they added hard disks and used LVM for storing data ) where data is stored.
> >
> > Is there a way to get all these images to be exported as Single image file
Instead of multiple image files from Rhevm it self. Is this possible ?
> >
> > If possible how to combine e all these disk images to a single image and that
image can upload to our cloud glance storage as a single image ?
>
> It is not clear what is the vm you are trying to export. If you share
> the libvirt xml
> of this vm it will be more clear. You can use "sudo virsh -r dumpxml
vm-name".
>
> RHV supports download of disks to one image per disk, which you can move
> to another system.
>
> We also have export to ova, which creates one tar file with all exported disks,
> if this helps.
>
> Nir
>