Run script for my alpine VM created with https://github.com/keygenqt/skill-qemu-alpine

alpine.sh

#!/usr/bin/env sh
set -eu

PORT="2224"

SCRIPT="$0"

while [ -L "$SCRIPT" ]; do
  DIR="$(cd -P "$(dirname "$SCRIPT")" && pwd)"
  SCRIPT="$(readlink "$SCRIPT")"
  case "$SCRIPT" in
    /*) ;; # absolute
    *) SCRIPT="$DIR/$SCRIPT" ;;
  esac
done

SCRIPT_DIR="$(cd -P "$(dirname "$SCRIPT")" && pwd)"

DISK_NAME="$SCRIPT_DIR/alpine.x86_64.qcow2"

[ -f "$DISK_NAME" ] || {
  echo "Disk not found: $DISK_NAME"
  exit 1
}

if nc -z localhost "$PORT" 2>/dev/null; then
  echo "VM already running → connecting via SSH"
  exec ssh -p "$PORT" localhost
fi

echo "Starting the VM..."

qemu-system-x86_64 -enable-kvm \
  -machine pc \
  -cpu host -smp cores=4 \
  -m 8192 \
  -display none \
  -daemonize \
  -drive if=virtio,id=hd,format=qcow2,file=$DISK_NAME \
  -nic user,hostfwd=tcp::$PORT-:22,model=virtio \
  -device virtio-rng-pci \
  -rtc base=utc,clock=host

echo "Waiting for SSH..."

until ssh -p "$PORT" \
  -o ConnectTimeout=1 \
  -o StrictHostKeyChecking=no \
  -o UserKnownHostsFile=/dev/null \
  localhost true 2>/dev/null; do
  sleep 0.3
done

echo "Connecting..."
ssh -p $PORT localhost

I have this symlinked in my $PATH as alpine, allowing me to both start the VM, and to SSH into it if already running.

The disk image was created via the install.sh found at https://github.com/keygenqt/skill-qemu-alpine/tree/main/x86_64

#!/bin/bash
ALP_ARCH=x86_64 
DISK_NAME="alpine.$ALP_ARCH.qcow2"
DISK_SIZE="8G"

#Get last release and iso file name
ALP_VIRT_LAST_ISO=$(wget -qO- "https://dl-cdn.alpinelinux.org/alpine/latest-stable/releases/$ALP_ARCH/latest-releases.yaml" | grep "iso: alpine-virt" | cut -d':' -f2- | tr -d '[:space:]')
ALP_VIRT_VERSION=$(echo $ALP_VIRT_LAST_ISO | cut -d'-' -f3)

#Display detected last-version of virt
echo "Last Alpine release for $ALP_ARCH version: $ALP_VIRT_VERSION  iso:$ALP_VIRT_LAST_ISO"
echo "Starting download.."

URL_DISTR="https://dl-cdn.alpinelinux.org/alpine/latest-stable/releases/$ALP_ARCH/$ALP_VIRT_LAST_ISO"

# Download Alpine
if [ ! -f $(basename $URL_DISTR) ]; then
  wget $URL_DISTR
fi

# Create qemu disc
if [ ! -f "$DISK_NAME" ]; then
  qemu-img create -f qcow2 "$DISK_NAME" "$DISK_SIZE"
fi

# Run qemu
qemu-system-x86_64 -enable-kvm \
  -machine pc \
  -cpu host -smp cores=4 \
  -m 2048 \
  -cdrom $(basename $URL_DISTR) \
  -drive format=qcow2,file=$DISK_NAME \
  -nographic