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

On Wednesday, 4 August 2021 03:54:36 CEST KK CHN wrote: > On Wed, Aug 4, 2021 at 1:38 AM Nir Soffer <nsoffer(a)redhat.com&gt; wrote: > > 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 > > 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(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