support matrix, known working configurations

[jgotteswinter]

Currently ACS has a list of supported os for management servers and hypervisors. I know about 2 bug tickets which affect Ubuntu 24.04, one is a bug one seems to be a missing libvirt feature used by a ACS function.

The management servers are unproblematic from my point of view, the problems start with the hypervisors and many different libvirt/qemu versions. Wouldnt it be the better approach to have a matrix of known working libvirt / qemu versions which also reflects new added features that need specific libvirt or qemu versions to work? I am not the documentation fanatic, a simple spreadsheet would be my solution.

[DaanHoogland]

@jgotteswinter why not create a table here? (markdown is supported)

[jgotteswinter]

... its friday. sure :)

[tatay188]

@DaanHoogland @jgotteswinter Is it Ok for me to contribute to your table ?

[jgotteswinter]

more than welcome <3
modify it, extend it if you think it helps

[tatay188]

can you add me as a collaborator with write permissions to edit the same table just to keep it clean, instead of copying it multiple times. or you prefer to copy it.

[jgotteswinter]

Seems like i cant do this. "Only the original author and people with write access (or higher) to the apache/cloudstack repository can edit your comment."

I copied my draft to google spreadsheet until we find a final solution

https://docs.google.com/spreadsheets/d/1oZr-IWYpjQq8GUYgUnr3pzzYQlEyt2NYVXmwa-nYn5Y/edit?usp=sharing

Lets see how quick this gets vandalised :)

Maybe someone wants to add more information about the EL clones, i lost the overview after they introduced module streams and so on.

Should we separate Rocky, Alma, Oracle Linux and EL? EL is the "original", all others use different ways of reproducing EL which might end up in slightly different results. Thats my last knowledge about the EL.

I did not list SuSE, does anybody use SLES or OpenSUSE?

[jgotteswinter]

Typical Real-World KVM Combinations for Apache CloudStack (2025–2026)

Distribution	Release	libvirt	QEMU	Recommended CloudStack Versions	Notes / Known Limitations
Rocky / AlmaLinux	8.10
Rocky / AlmaLinux	9.4 / 9.5
Rocky / AlmaLinux	9.5 / 9.6
Ubuntu Server	22.04.5 LTS
Ubuntu Server	24.04 LTS	10.0	8.2.2		Modern stack, UEFI live snapshot limitation (disk+memory): Fails on libvirt 10.0 with "Operation not supported: internal snapshots of a VM with pflash based firmware are not supported". Workaround: Disable memory snapshot for running instances; full support in libvirt 10.9+. See Discussion #12427 Severe agent performance degradation over time: Thread leak in libvirt storage pool handling (affected: libvirt 10.0–10.4); causes slowdowns in VM ops, high CPU, needs frequent restarts or config tweaks (reduce agent threads, increase usage metric interval to hours). Fixed in libvirt 10.6+ (e.g. 10.6.0-1ubuntu3.3 works well). Highly recommended to use patched/backported libvirt or wait for Ubuntu fix. See Discussion #12450
Debian	12 (Bookworm)				Solid choice, but fewer community tests than Rocky/AlmaLinux
Debian	13 (Trixie)	~11.3	~10.0		Modern & stable (released Aug 2025, point releases ongoing). Excellent for new features (better UEFI, virtio, performance). Officially "expected to work" like Ubuntu/Debian 12. Community confirms good KVM host support with minor tweaks (using Adoptium JDK 17). Fewer large-scale tests vs. Rocky 9. See GitHub #12374 for tracking.