Re: [ovirt-users] Use an oVirt-VM as a VDSM server
Hi, You will need to enable nested virtualization in your physical host. To check if enable: cat /sys/module/kvm_intel/parameters/nested If the output is "N", you will need to add a file /etc/modprobe.d/kvm_intel.conf with the content: options kvm-intel nested=Y Then reboot, or reload the KVM module. Note that the performance of the nested VMs will be impacted. Regards, Fred [1] https://www.linux-kvm.org/page/Nested_Guests [2] https://www.linuxtechi.com/enable-nested-virtualization-kvm-centos-7-rhel-7/ On Mon, Apr 30, 2018 at 4:02 PM, James Michels < karma.sometimes.hu...@gmail.com> wrote: > Greetings. > > In terms of teaching our students how to create and configure an oVirt > infrastructure, we're planning to provide each of them a VM that will act > as a Manager server, which has no issues so far. The problem is that we > don't have enough physical machines to use as virtualization servers > (VDSM), therefore we have been trying to use a CentOS7 based oVirt guest to > run as a VDSM server. > > However, when trying to add it as a host, a (logical) error message shows > up saying that the VM doesn't allow virtualization. > > The question is simple: Is there a way to enable virtualization on an > oVirt VM, so we can deploy them as VDSM servers? > > This is oVirt 4.2.2 FWIW. > > Thanks > > James > > ___ > Users mailing list > Users@ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > > ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] Use an oVirt-VM as a VDSM server
On Monday, April 30, 2018 9:02:35 AM EDT James Michels wrote: > Greetings. > > In terms of teaching our students how to create and configure an oVirt > infrastructure, we're planning to provide each of them a VM that will act > as a Manager server, which has no issues so far. The problem is that we > don't have enough physical machines to use as virtualization servers > (VDSM), therefore we have been trying to use a CentOS7 based oVirt guest to > run as a VDSM server. > > However, when trying to add it as a host, a (logical) error message shows > up saying that the VM doesn't allow virtualization. > > The question is simple: Is there a way to enable virtualization on an oVirt > VM, so we can deploy them as VDSM servers? > > This is oVirt 4.2.2 FWIW. > > Thanks > > James James, Yes its possible, when you install (or re-install) a PHYSICAL host, in the host popup dialog there is a kernel tab. Enable 'Nested Virtualization' kernel parameter. Once that is enabled and the host is rebooted then you can use VMs as VDSM hosts for your setup. Some gotchas: - Make sure your cluster cpu type actually matches your physical hosts, if you select a wrong one then the exposed CPU options will be wrong and the nested virtualization will not work properly. - You will need to enable mac spoofing for the networking to work correctly. - VMs running inside a host that is a VM itself will likely have a fairly significant performance hit due to the nested virtualization. ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
