On Tue, Aug 3, 2021 at 7:29 PM KK CHN <[email protected]> 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 <[email protected]> wrote:
>>
>> On Mon, Aug 2, 2021 at 12:22 PM <[email protected]> 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
>>
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