VM Templates

Suggested VMID 15000 · 1 vCPU · 1024 MB RAM · 5G disk · CPU host · firmware uefi

#!/usr/bin/env bash
# Run on a Proxmox node as root. Adjust STORAGE/BRIDGE if needed.
# UEFI: include Proxmox cloud-init drive (scsi1) at create time. Legacy BIOS: OS disk only.
# NodeRings removes template cloud-init drives and injects cidata on ide2 at provision time.
set -euo pipefail

command -v qm >/dev/null || { echo "Run this on a Proxmox node (qm not found)"; exit 1; }

storage_supports_images() {
  local st=$1 content
  content=$(pvesm status -storage "$st" 2>/dev/null | awk -v s="$st" 'NR>1 && $1==s { print $3; exit }')
  [[ "$content" == *images* ]]
}

resolve_storage() {
  local st
  if [[ -n "${STORAGE:-}" ]]; then
    if storage_supports_images "$STORAGE"; then echo "$STORAGE"; return; fi
    echo "STORAGE=$STORAGE does not support VM disk images" >&2; exit 1
  fi
  for st in local-lvm local; do
    if storage_supports_images "$st"; then echo "$st"; return; fi
  done
  st=$(pvesm status -content images 2>/dev/null | awk 'NR>1 { print $1; exit }')
  [[ -n "$st" ]] && { echo "$st"; return; }
  echo "No storage with VM disk image support. Set STORAGE= explicitly." >&2; exit 1
}

STORAGE=$(resolve_storage)
echo "Using storage: $STORAGE"
BRIDGE="${BRIDGE:-vmbr0}"
WORKDIR="${WORKDIR:-/tmp/noderings-vm-templates}"
VMID=15000
NAME="ubuntu-2204-template"
IMG="ubuntu-2204.img"
URL="https://cloud-images.ubuntu.com/jammy/current/jammy-server-cloudimg-amd64.img"

if qm config "$VMID" &>/dev/null; then
  echo "VMID $VMID already exists. Destroy it first: qm destroy $VMID --purge 1"
  exit 1
fi

mkdir -p "$WORKDIR"
cd "$WORKDIR"

echo "Downloading $NAME ..."
wget --show-progress -L -O "$IMG" "$URL"
[[ -s "$IMG" ]] || { echo "Download failed: empty file"; exit 1; }
[[ $(stat -c%s "$IMG") -gt 100000000 ]] || {
  echo "Download failed: file too small ($(stat -c%s "$IMG") bytes). Check URL:"
  echo "  $URL"
  exit 1
}
qemu-img resize "$IMG" 5G 2>/dev/null || true

qm create "$VMID" --name "$NAME" --memory 1024 --cores 1 --cpu host \
  --net0 "virtio,bridge=${BRIDGE},firewall=1" \
  --bios ovmf --agent enabled=1 \
  --efidisk0 "${STORAGE}:${VMID},efitype=4m" \
  --ostype l26 --serial0 socket --vga serial0 --machine q35 \
  --scsi1 "${STORAGE}:cloudinit" --scsihw virtio-scsi-pci \
  --sockets 1 --numa 0

qm set "$VMID" --scsi0 "${STORAGE}:0,import-from=${WORKDIR}/${IMG}"
qm set "$VMID" --boot c --bootdisk scsi0
qm disk resize "$VMID" scsi0 5G 2>/dev/null || true

VOLID=$(qm config "$VMID" | sed -n 's/^scsi0:.*:\(vm-[0-9]*-disk-[0-9]*\).*/\1/p')
DISK=$(pvesm path "${STORAGE}:${VOLID}")
if [[ -b "$DISK" ]]; then
  [[ $(blockdev --getsize64 "$DISK") -gt 104857600 ]] || { echo "Import empty (block device too small)"; exit 1; }
else
  [[ $(du -k "$DISK" | cut -f1) -gt 102400 ]] || { echo "Import empty"; exit 1; }
fi
disk_has_partitions() {
  local disk_path=$1
  if sgdisk -p "$disk_path" 2>/dev/null | grep -qE '^[[:space:]]*[0-9]+[[:space:]]'; then return 0; fi
  if fdisk -l "$disk_path" 2>/dev/null | grep -qE '^/dev/'; then return 0; fi
  return 1
}
if ! disk_has_partitions "$DISK"; then
  echo "No partition table on imported disk"
  exit 1
fi

qm template "$VMID"
rm -f "$IMG"

echo "Template ready: VMID $VMID ($NAME)"