qemu-system-x86_64 -m 4096 -smp 2 -drive file=noble-server-cloudimg-amd64.img,format=qcow2 -net user,hostfwd=tcp::2222-:22 -net nic
| Area | Recommendation | |------|----------------| | | Use virtio-scsi + discard (TRIM support) | | Memory | Install qemu-guest-agent for ballooning | | Time sync | systemctl enable --now chrony | | Kernel | Use linux-image-virtual (lighter) | | SSH | Disable password auth, use SSH keys | | Firewall | ufw default deny incoming && ufw enable | vm image ubuntu
Virtual machine images are pre-configured disk templates containing an operating system and optional software. Ubuntu provides official, minimal, production-ready VM images for x86_64 and ARM64 architectures. These images reduce deployment time from hours (bare-metal install) to minutes. These are pre-installed disk images (usually
These are pre-installed disk images (usually .qcow2 or .img format) provided by Canonical. They are "golden images"—the OS is already installed; it just needs to be configured on first boot. format=qcow2 -net user