I’m assuming running all on one node (management, DB, Usage and KVM host), this is not ideal and not recommended at all, I’d suggest add another node and migrate management, db and usage to it, then you can reinstall your current compute node (also assuming you have shared storage, this will not work for local storage).
Regards, Boris. From: Fariborz Navidan <[email protected]> Date: Tuesday, 16 June 2026 at 1:57 pm To: [email protected] <[email protected]> Subject: Re: URGENT: KVM Host freezes even in emergency mode Hi This is a single node cloudstack setup. If I take a backup of all VM volumes and cloudstack database, can I get them running on a fresh cloudstack installation? Regards On Tue, Jun 16, 2026 at 12:23 PM Boris Stoyanov < [email protected]> wrote: > Hi Fariborz, > > This does not look like a Cloudstack issue, assuming this is a compute > host and storage is somewhere else, why don’t you reinstall it to a stock > version of the linux distro you are running and try again? > > Thanks, > Boris. > > > <https://www.cloudstackcollab.org> > *From: *Fariborz Navidan <[email protected]> > *Date: *Tuesday, 16 June 2026 at 12:25 pm > *To: *[email protected] <[email protected]> > *Subject: *URGENT: KVM Host freezes even in emergency mode > > Hi Everbody > > I have a very odd issue on the KVm host where both agent and management is > installed. > > Recently I have tried to mirror outbound smtp traffic from a test vm to IFB > device to analyze it using zeek for spam filtering. I did the mirroring > using tc filters. Everything was working before I added a custom libvirt > hook inside */etc/libvirt/hooks/qemu.d* and restarted libvirtd service to > add tc filter rule to any new VM being created. > > Once I restarted libvirtd host freezed and afterwards everytime host boots > it freezes not accepting any input even in emergency mode. When I enter > emergency mode, it only allows me a few seconds to issue a command and then > freezes. This happens even if I mask NetworkManager, libvirtd and > cloudstack-agent during boot to disable any service that cause system > freeze > > I have reverted back everything but still kernel freezes > > As I needed to analyze existing smtp traffic I needed to do on the > production server but everything is down. > > Please help! > > Best Regards >
