Create Ubuntu Clone Template VM on Proxmox via Cloud-Init

proxmox-ubuntu-cloud-init-template.sh

#!/usr/bin/env bash

# ╔══════════════════════════════════════════════════════════════════════════╗
# ║ Copyright © 2024 The Artifex (4r7if3x). Published under the MIT License. ║
# ╚══════════════════════════════════════════════════════════════════════════╝

# Initializing
set -e; echo

# Setting variables
CLOUD_IMAGE_URL="https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img"
CLOUD_IMAGE_FILE=/tmp/$(basename "$CLOUD_IMAGE_URL")
VM_ID=1000
STORAGE_ID="local-lvm"
BRIDGE_ID=1
USERNAME=ubuntu
PASSWORD=$(< /dev/urandom tr -dc 'A-Za-z0-9_@#%^' | head -c 24)
SSH_KEYS_FILE=$(mktemp)

cat <<-EOF > "$SSH_KEYS_FILE"
	ssh-ed25519 ... user@example.com
EOF

# Downloading and converting the image
wget -nc -P /tmp "$CLOUD_IMAGE_URL"
qemu-img resize "$CLOUD_IMAGE_FILE" 32G

# Creating the VM
#   Using serial interface: --vga serial0 --serial0 socket
#   Setting VLAN number: --net0 virtio,bridge="vmbr${BRIDGE_ID},tag=1
sudo qm create "$VM_ID" --name "ubuntu-template" --ostype l26 \
	--cpu host --socket 1 --cores 1 \
	--memory 1024 \
	--vga virtio \
	--net0 virtio,bridge="vmbr${BRIDGE_ID}" \
	--bios ovmf --machine q35 --efidisk0 "${STORAGE_ID}:0,pre-enrolled-keys=0" \
	--agent 1

# Configuring hardware
sudo qm importdisk "$VM_ID" "$CLOUD_IMAGE_FILE" "$STORAGE_ID"
sudo qm set "$VM_ID" --scsihw virtio-scsi-pci --virtio0 "${STORAGE_ID}:vm-${VM_ID}-disk-1,discard=on" # 'discard' should be enabled on SSDs
sudo qm set "$VM_ID" --boot order=virtio0
sudo qm set "$VM_ID" --scsi1 "${STORAGE_ID}:cloudinit"

# Creating the vendor.yaml file for CloudInit
mkdir -p /var/lib/vz/snippets
cat <<EOF | sudo tee /var/lib/vz/snippets/vendor.yaml
#cloud-config
runcmd:
  - apt update
  - apt install -y qemu-guest-agent
  - systemctl enable qemu-guest-agent
  - timedatectl set-timezone UTC
  - reboot
EOF

# Configuring CloudInit
sudo qm set "$VM_ID" --cicustom "vendor=local:snippets/vendor.yaml"
#sudo qm set "$VM_ID" --tags cloud-init,template,ubuntu-server,24.04-lts
sudo qm set "$VM_ID" --ciuser "$USERNAME"
sudo qm set "$VM_ID" --cipassword "$PASSWORD"
sudo qm set "$VM_ID" --sshkeys "$SSH_KEYS_FILE"
sudo qm set "$VM_ID" --ipconfig0 ip=dhcp

# Converting to template
sudo qm template "$VM_ID"

# Finalizing
echo -e "\nDone! Password: ${PASSWORD}\n"