This Bash script sets up a virtual machine using QEMU and a VNC viewer called spicy, allowing for remote access and control. The script can be run to launch a virtual machine with a VNC connection, automatically connecting to it with the VNC viewer.

Cell 6

#!/bin/sh
SPICE_PORT=5924
qemu-system-x86_64 -enable-kvm -daemonize \
    -cpu host \
    -drive file=WindowsVM.img,if=virtio \
    -net nic -net user,hostname=windowsvm \
    -m 1G \
    -vga qxl \
    -spice port=${SPICE_PORT},disable-ticketing \
    -usbdevice tablet \
    -device virtio-serial \
    -chardev spicevmc,id=vdagent,name=vdagent \
    -device virtserialport,chardev=vdagent,name=com.redhat.spice.0 \
    "$@"
exec spicy --title Windows 127.0.0.1 -p 5924

bash
#!/bin/bash

# Define virtual machine configuration
VM_CONFIG_FILE="vm_config.sh"
VM_NAME="WindowsVM"
VM_IMAGE="WindowsVM.img"

# Define port for spice connection
SPICE_PORT=${1:-5924}

# Define virtual machine architecture
VM_ARCH="x86_64"

# Define amount of RAM for the virtual machine
VM_RAM=1G

# Define virtual machine graphics
VM_GRAPHICS="qxl"

# Define network settings
VM_NETWORK="user,hostname=${VM_NAME}"

# Define USB settings
VM_USB="tablet"

# Define virtio-serial settings
VM_VIRTIO_SERIAL=device virtio-serial

# Define vdagent settings
VM_VDAGENT="chardev spicevmc,id=vdagent,name=vdagent"

# Define virtserialport settings
VM_VIRT_SERIAL_PORT="device virtserialport,chardev=vdagent,name=com.redhat.spice.0"

# Check for required dependencies
if! command -v qemu-system-x86_64 &> /dev/null; then
  echo "Error: QEMU is not installed."
  exit 1
fi

if! command -v spicy &> /dev/null; then
  echo "Error: Spicy is not installed."
  exit 1
fi

# Load user provided arguments
shift 1

# Start QEMU in daemon mode
qemu-system-x86_64 -enable-kvm -daemonize \
  -cpu host \
  -drive file=${VM_IMAGE},if=virtio \
  -net nic -net ${VM_NETWORK} \
  -m ${VM_RAM} \
  -vga ${VM_GRAPHICS} \
  -spice port=${SPICE_PORT},disable-ticketing \
  -usb ${VM_USB} \
  -${VM_VIRTIO_SERIAL} \
  -${VM_VDAGENT} \
  -${VM_VIRT_SERIAL_PORT} \
  "$@"

# Connect to the virtual machine using Spicy
exec spicy --title ${VM_NAME} 127.0.0.1 -p ${SPICE_PORT}

# TODO: Add error handling for Spicy connection

Script Overview

This is a Bash script that sets up a virtual machine using QEMU and a VNC viewer called spicy.

Breakdown

1. Environment Variables

   • SPICE_PORT is set to 5924, which is the port number for the VNC connection.

2. QEMU Command

   • The qemu-system-x86_64 command is used to start a virtual machine on an x86_64 architecture.
   • -enable-kvm enables the KVM (Kernel-based Virtual Machine) acceleration feature for better performance.
   • -daemonize runs QEMU as a daemon, allowing it to detach from the console.
   • -cpu host specifies that the virtual machine should use the host's CPU.
   • -drive specifies the virtual hard drive image file.
   • -net nic and -net user are used to configure a network interface for the virtual machine.
   • -m 1G allocates 1 GB of memory for the virtual machine.
   • -vga qxl specifies the graphical card for the virtual machine.
   • -spice specifies the VNC connection settings.
   • -usbdevice tablet and -device virtio-serial are used to configure a USB tablet and a virtual serial port.
   • -chardev spicevmc and -device virtserialport are used to enable VNC support.
   • The last part of the QEMU command allows additional arguments to be passed to the script.

3. exec Command

   • The exec command is used to start a new process, replacing the current one.
   • spicy is the VNC viewer command.
   • The rest of the command specifies the title and settings for the VNC connection.

Usage

This script is likely used to launch a virtual machine with a VNC connection. When run, it will start the virtual machine and automatically connect to it with the VNC viewer.