Introduction

Two ways to create virtual machines.

Create a Single VM

• Creates only one KVM/QEMU virtual machine, automatically detects international or domestic server
• Can configure binding of an independent IPv6 address (requires host to have a public IPv6 address and IPv6 network configured during installation)
• Supports x86_64 and ARM64 architecture servers

Download Script

curl -sSLO https://raw.githubusercontent.com/oneclickvirt/qemu/main/scripts/oneqemu.sh
chmod +x oneqemu.sh

Example

Supported variables:

./oneqemu.sh <name> <cpu> <memory_mb> <disk_gb> <password> <sshport> <startport> <endport> [independent_ipv6:y/n] [system]

Currently supported systems:

• debian
• ubuntu

Default is debian if not specified.

./oneqemu.sh vm1 1 1024 10 MyPassword 25000 34975 35000 n debian

Example VM details:

Property	Value
VM name	vm1
SSH username	root
SSH password	MyPassword
CPU cores	1
Memory	1024MB
Disk size	10GB
SSH port	25000
Port mapping range	34975 to 35000
System	debian
Independent IPv6	N

Related Operations

List all virtual machines

virsh list --all

Start a virtual machine

virsh start vm1

Shut down a virtual machine

virsh shutdown vm1

Force stop a virtual machine

virsh destroy vm1

Access VM console

virsh console vm1

Press Ctrl + ] to exit the console.

Delete example

virsh destroy vm1
virsh undefine vm1 --remove-all-storage

View VM info

virsh dominfo vm1

Batch Create VMs

• Generates multiple VMs inheriting the same configuration
• Automatically increments VM names (vm1, vm2, ...), SSH ports, and public ports
• VM information is logged to the vmlog file
• It is recommended to run in a screen session when creating multiple VMs to avoid SSH disconnection
• Supports x86_64 and ARM64 architecture servers

Run

curl -sSLO https://raw.githubusercontent.com/oneclickvirt/qemu/main/scripts/create_qemu.sh
chmod +x create_qemu.sh
./create_qemu.sh

Query Batch Creation Info

cat vmlog

Output format:

VM-name SSH-port root-password CPU-cores memory disk start-port end-port

One line per VM.

Delete All VMs and Images

for vm in $(virsh list --all --name); do virsh destroy "$vm" 2>/dev/null; virsh undefine "$vm" --remove-all-storage; done
rm -rf vmlog

Restart All VMs After Host Reboot

QEMU/KVM supports setting VMs to autostart via libvirt:

# Enable autostart for a specific VM
virsh autostart vm1

# Check autostart status
virsh dominfo vm1 | grep Autostart

# Disable autostart
virsh autostart vm1 --disable

Or manually start all stopped VMs:

for vm in $(virsh list --all --name); do virsh start "$vm" 2>/dev/null; done