[ovirt-users] Re: Combining Virtual machine image with multiple disks attached

On Tue, Aug 3, 2021 at 7:29 PM KK CHN <kkchn.in(a)gmail.com&gt; 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

$ 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&gt; wrote: >> >> On Mon, Aug 2, 2021 at 12:22 PM <kkchn.in(a)gmail.com&gt; 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 >>