Virtualization with QEMU/KVM & Proxmox
A practical virtualization lab covering VM creation, virtual networking, storage selection, snapshots/backups, console access, and post-deployment verification. The case study treats a VM as an operational asset rather than just a bootable disk image.
HOST & NETWORK DESIGN
The host is planned around CPU virtualization support, memory headroom, storage I/O, and bridge/network design. Management traffic is kept predictable and VM networks are documented before guests are created.
VM PROVISIONING
A VM profile records vCPU, memory, disk bus, firmware, network adapter, and installation source. The configuration is deliberately simple so performance problems can be isolated later.
COMMANDS & LIFECYCLE
QEMU/KVM hosts can be inspected with virsh while Proxmox uses tools such as qm. The examples below show safe inventory and lifecycle operations rather than destructive storage commands.
$ qm list VMID NAME STATUS MEM(MB) BOOTDISK(GB) 101 lab-web running 4096 32 102 lab-monitor stopped 4096 32 $ qm config 101 | head -n 8 cores: 2 memory: 4096 net0: virtio=XX:XX:XX:XX:XX:XX,bridge=vmbr0
$ virsh list --all Id Name State 3 lab-db running - lab-test shut off $ virsh dominfo lab-db | grep -E 'CPU|Max memory|Used memory' CPU(s): 2 Max memory: 4194304 KiB Used memory: 4194304 KiB
VALIDATION & RECOVERY
After installation, guest networking, clock synchronization, disk performance, shutdown/reboot, snapshot behavior, and backup/restore procedures are tested. A recovery test proves that the backup is actually useful.
LESSONS LEARNED
Virtualization is mostly resource management and observability. CPU overcommit, memory pressure, storage latency, and bridge configuration can all produce symptoms that look like application problems.