Re: OLVM on VirtualBox

Hey Uwe,
I was planning to blog about it sometime soon but here you are asking questions .
I see you have managed to enable nested virtualization in virtualbox which is possible since vbox 6.1.4 ish.
 For those who want to know how to do that, they can check my other BlogPost
<https://brokedba.blogspot.com/2020/04/how-to-enable-nested-virtualization-in.html>
.

 The problem with nested virtualization here (KVM inside Vbox) is that

• virtualbox doesn't support *kvm* domain type (kernel based hypervisor) .
  • This issue is similar to what openstak <https://community.brightcomputing.com/question/5d6614ba08e8e81e885f1a97> and miniduke <https://github.com/kubernetes/minikube/issues/2991> users encounter when they use kvm within vbox *"could not find capabilities for domaintype=kvm"*
    • The only flavor you'll have left to use is the emulated version of kvm called qemu which is less efficient(slower) since it emulates both CPU and hardware (unlike kvm).
    • The workaround, for instance, when using virsh is to change the domain type to qemu so the vm can start.

$virsh edit My-vm<domain type='kvm'> ===== replace 'kvm' by 'qemu'
<name>My-vm</name>

...

• Now OLVM which is a fork of ovirt under virtualbox is another story as installing the host engine and kvm all in one same box is not a good idea. Why? because I tried and failed like you a few months ago(see pic).
  • Try asking in their community space
    <https://community.oracle.com/community/groundbreakers/server_&_storage_systems/linux/oracle-linux-kvm>
    or leave a comment here
    <https://blogs.oracle.com/virtualization/getting-started-with-oracle-linux-virtualization-manager>
    Good luck with that though, as I was quite frankly disappointed by the (lack of) responsiveness of OLVM PMs. Who knows, you may be luckier than me if you know someone from the inside. I myself gave up on them and decided to ask help from the OVirt community (they're more laid-back) .

That being said, you could always try to install the engine in another vm, link it to your kvm box and restart spinning vms again (if . But I agree with you, it's not a popular topic yet.

Koss

>
> On Sat, Jun 27, 2020 at 4:36 PM Uwe Küchler <uwe_at_kuechler.org> wrote:
>
>> Dear oracle-l'ers,
>>
>> I'm astonished there's not post at all on OLVM yet to be found on this
>> list. Well, here's the first one, then! :-)
>>
>> I'm trying to get an R&D environment for OLVM running on my Laptop in
>> VirtualBox (6.1.8).
>> Installation of the engine and one KVM host works, but as soon as I try
>> to start the first VM, an error is thrown and the VM remains in pause
>> mode.
>>
>> The Laptop runs on an Intel Core i7 8565U CPU, which features VT-x and
>> VT-d, the virtualization features necessary to run nested
>> virtualization.
>> Nested virtualization is turned on for the KVM Host VM. "grep vmx
>> /proc/cpuinfo" shows vmx is available.
>>
>> Before i bore the heck out of you with a log file:
>>
>> Has anyone here managed to run OLVM on VirtualBox?
>>
>> Cheers,
>> Uwe
>> --
>> http://www.freelists.org/webpage/oracle-l
>>
>>
>>

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