On Wednesday, 4 August 2021 03:54:36 CEST KK CHN wrote:
On Wed, Aug 4, 2021 at 1:38 AM Nir Soffer <nsoffer@redhat.com> wrote:
On Tue, Aug 3, 2021 at 7:29 PM KK CHN <kkchn.in@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
To perform this which modules/packages need to be installed in the rhevm
host node ? Does the rhevm hosts come with python3 installed by default ? or I need to install python3 on rhevm node ?
You don't have to install anything on oVirt hosts. SDK has to be installed on the machine from which you run the script. See https://github.com/oVirt/ovirt-engine-sdk/blob/master/sdk/README.adoc for more details, how to install and use it.
Then using pip3 to install the download_disk.py / what the module name to install this sdk ? any dependency before installing this sdk ? like java need to be installed on the rhevm node ?
One doubt: came across virt v2v while google search, can virtv2v be used in rhevm node to export VMs to images ? or only from other hypervisors to rhevm only virt v2v supports ?
This requires ovirt.conf file: // ovirt.conf file need to be created ? or already there in any rhevm node?
again, this has to be on the machine from which you run the script
$ 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@redhat.com> wrote:
On Mon, Aug 2, 2021 at 12:22 PM <kkchn.in@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