That depends on what you plan on doing with the host. IIRC live VM
migrations use host CPU time, and depending on transport can use quite a
bit of CPU (for encryption/compression). Same with storage, if you have
a ZFS/btrfs/LVM2/RAID/encryption setup that requires a lot of CPU,
that's also counted against host CPU time.
libvirtd itself doesn't need all that much resources for itself, that
said. 2 cores and 2GB RAM should suffice as baseline? Plus whatever you
need to meet above needs, if any apply.
Hi Sven,
So for host OS, 2 vCPU's with 2GB Memory is enough. Please comment. I have spawned 10 KVM based VM's with CentOS 7.6 on the bare metal server (Dell R630 Poweredge 1U with 32 cores vCPU's and 96 GB RAM.) Is there a way to find out the system resources utilization for all the 10 VM's?
Best Regards,