Hi,
On a CentOS 6 host I run Rocky 9 VM’s without any problems. Now I tried several nethods to initialize a RL 10 VM, without success. I tried virt-install with -l (location …/10/BaseOS/x86_64/os/ ), with -c (boot.iso), but all attempts end up in “no bootable disk”. I also tried a generic cloud image (converted from qcow2 v3 to qcow2 v2), resulting in the same error. Is it really impossible to run a RL 10 VM on CentOS 6?
Thanks, Jos
CentOS 6 is EOL since 2020 - 5 years ago. Seriously you should have upgraded that system. So not surprising new OS doesn’t run on it.
We don’t support CentOS 6 here.
I know the status of CentOS 6 (it’s an old host I still use for devel VM’s) and I do not consider my issue as a bug of RL 10 or so. Still, I’m curious to know what’s causing this and if there maybe is a workaround.
Could well be due to changes and advancement in KVM VM’s that CentOS 6 simply doesn’t have. It would make no sense for Rocky to provide compatible KVM images for CentOS 6 when it’s already a deprecated platform. I expect they are built for current technologies.
Maybe the VM is created for MBR when UEFI is required, maybe CentOS6 doesn’t have the UEFI requirements to boot it. Could be pretty much anything.
I would expect however for it to work the other way around, eg: install a CentOS 6 VM on a Rocky 10 KVM host. Old will mostly work on new systems, but new will pretty much be problematic to run on old systems so is to be expected. I doubt very much there will be a workaround, and TBH nobody would bother spending the time on it simply because it’s old deprecated and EOL.
Probably better, migrate/backup your VM’s, and then clean install this CentOS 6 machine with something newer.
The continued use of a CentOS 6 machine in the cybersecurity environment of 2025 for anything other than a very specialised application supporting old equipment connected to the machine that cannot be upgraded, something which this is not, is both highly unprofessional and completely reprehensible.
You are rightly going to get no support for your reckless behaviour.
My guess, given that you are running CentOS6, is that the machine does not have x86_64 v3 CPUs and thus any attempts to run a Rocky 10 based VM which like RHEL10 requires a modern CPU are doomed to failure.
That is a CPU with avx avx2 bmi1 bmi2 f16c fma abm movbe xsave instructions (and some older too, see GitHub - HenrikBengtsson/x86-64-level: x86-64-level - Get the x86-64 Microarchitecture Level on the Current Machine ) is required, and the hypervisor must pass those to the guest too.
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