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To add more nodes to a Talos Linux cluster, follow the same procedure as when initially creating the cluster:
  • Boot the new machines to install Talos Linux
  • Apply the appropriate configuration file (worker.yaml or controlplane.yaml) to each new machine

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Get the appropriate machine configuration

You need a valid controlplane.yaml or worker.yaml to apply to new nodes. If your cluster has been upgraded since it was initially created, your original files may be stale, regenerate them instead using the reproducible machine configuration workflow.

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Apply configuration to new nodes

Once you have the machine config, apply it to each new node using its IP address: 
talosctl apply-config --insecure \
  --nodes <NODE-IP> \
  --file <new-config-yaml>
The --insecure flag is required because the PKI infrastructure has not yet been made available to the new node. You do not need to bootstrap the new node. Whether you are adding a control plane or worker node, it will join the cluster automatically in its assigned role.