Nocloud

Creating a cluster via the CLI using qemu.

Talos supports nocloud data source implementation.

There are two ways to configure Talos server with nocloud platform:

  • via SMBIOS “serial number” option
  • using CDROM or USB-flash filesystem

SMBIOS Serial Number

This method requires the network connection to be up (e.g. via DHCP). Configuration is delivered from the HTTP server.

ds=nocloud-net;s=http://10.10.0.1/configs/;h=HOSTNAME

After the network initialization is complete, Talos fetches:

  • the machine config from http://10.10.0.1/configs/user-data
  • the network config (if available) from http://10.10.0.1/configs/network-config

SMBIOS: QEMU

Add the following flag to qemu command line when starting a VM:

qemu-system-x86_64 \
  ...\
  -smbios type=1,serial=ds=nocloud-net;s=http://10.10.0.1/configs/

SMBIOS: Proxmox

Set the source machine config through the serial number on Proxmox GUI.

The Proxmox stores the VM config at /etc/pve/qemu-server/$ID.conf ($ID - VM ID number of virtual machine), you will see something like:

...
smbios1: uuid=ceae4d10,serial=ZHM9bm9jbG91ZC1uZXQ7cz1odHRwOi8vMTAuMTAuMC4xL2NvbmZpZ3Mv,base64=1
...

Where serial holds the base64-encoded string version of ds=nocloud-net;s=http://10.10.0.1/configs/.

CDROM/USB

Talos can also get machine config from local attached storage without any prior network connection being established.

You can provide configs to the server via files on a VFAT or ISO9660 filesystem. The filesystem volume label must be cidata or CIDATA.

Example: QEMU

Create and prepare Talos machine config:

export CONTROL_PLANE_IP=192.168.1.10

talosctl gen config talos-nocloud https://$CONTROL_PLANE_IP:6443 --output-dir _out

Prepare cloud-init configs:

mkdir -p iso
mv _out/controlplane.yaml iso/user-data
echo "local-hostname: controlplane-1" > iso/meta-data
cat > iso/network-config << EOF
version: 1
config:
   - type: physical
     name: eth0
     mac_address: "52:54:00:12:34:00"
     subnets:
        - type: static
          address: 192.168.1.10
          netmask: 255.255.255.0
          gateway: 192.168.1.254
EOF

Create cloud-init iso image

cd iso && genisoimage -output cidata.iso -V cidata -r -J user-data meta-data network-config

Start the VM

qemu-system-x86_64 \
    ...
    -cdrom iso/cidata.iso \
    ...

Example: Proxmox

Proxmox can create cloud-init disk for you. Edit the cloud-init config information in Proxmox as follows, substitute your own information as necessary:

and then update cicustom param at /etc/pve/qemu-server/$ID.conf.

cicustom: user=local:snippets/master-1.yml
ipconfig0: ip=192.168.1.10/24,gw=192.168.10.254
nameserver: 1.1.1.1
searchdomain: local

Note: snippets/master-1.yml is Talos machine config. It is usually located at /var/lib/vz/snippets/master-1.yml. This file must be placed to this path manually, as Proxmox does not support snippet uploading via API/GUI.

Click on Regenerate Image button after the above changes are made.