added clout init image docs

README.md

@@ -3,3 +3,54 @@
 PVE-Go is a go library for the Proxmox VE API.
 
 The design is based on the Hetzner Clound API implementation: https://github.com/hetznercloud/hcloud-go
+
+## Cloud-Init Image
+
+How to prepare a cloud-init image.
+
+Download the latest version of the base image to one of your proxmox nodes:
+
+```
+curl -sSL https://cloud-images.ubuntu.com/bionic/current/bionic-server-cloudimg-amd64.img >/tmp/bionic-server-cloudimg-amd64.img
+```
+
+Create a cloud-init config to bootstrap the template:
+```
+cat <<'EOF'> /var/lib/vz/snippets/9000_bootstrap
+#cloud-config
+package_update: true
+package_upgrade: true
+ntp:
+  enabled: true
+  servers: ["pool.ntp.org"]
+ssh_deletekeys: true
+ssh_genkeytypes: ["ed25519", "rsa"]
+runcmd:
+- "apt-get -y clean"
+- "apt-get -y autoremove --purge"
+- "bash -c 'rm /home/ubuntu/.ssh/authorized_keys; exit 0'"
+- "bash -c 'find /var/log -type f | while read f; do echo -ne >$f; done; exit 0'"
+- "bash -c 'rm -rf /var/lib/cloud/*; exit 0'"
+power_state:
+  mode: poweroff
+EOF
+```
+
+Create the template VM:
+```
+qm destroy 9000
+qm create 9000 --memory 2048 --net0 virtio,bridge=vmbr0
+qm importdisk 9000 /tmp/bionic-server-cloudimg-amd64.img local
+qm set 9000 --scsihw virtio-scsi-pci --scsi0 local:9000/vm-9000-disk-0.raw
+qm set 9000 --ide0 local:cloudinit
+qm set 9000 --boot c --bootdisk scsi0
+qm set 9000 --serial0 socket --vga serial0
+qm set 9000 --cicustom "user=local:snippets/9000_bootstrap"
+qm set 9000 --ipconfig0 ip=dhcp,ip6=dhcp
+
+qm start 9000
+sleep 10;while :; do qm status 9000|grep -q stopped && break; done
+qm set 9000 --cicustom ""
+qm set 9000 --ipconfig0 ""
+qm template 9000
+```