Join a Kubernetes Worker Node to Your Master (Jetson Friendly)

Step 1: Get join command

On the master, run:

sudo kubeadm token create --print-join-command

This prints the full command with token and certificate hash.

Step 2: Run on worker

sudo kubeadm join <master-ip>:<port> --token ... --discovery-token-ca-cert-hash sha256:...

Step 3: Fix common errors

• Missing socat: sudo apt install socat
• br_netfilter not loaded:

  sudo modprobe br_netfilter
  echo "br_netfilter" | sudo tee /etc/modules-load.d/br_netfilter.conf
  sudo sysctl -w net.bridge.bridge-nf-call-iptables=1

• ip_forward = 0: edit /etc/sysctl.conf to add net.ipv4.ip_forward=1, then sudo sysctl -p.
• ebtables missing: sudo apt-get install ebtables

Step 4: Verify from master

kubectl get nodes

Your new worker should appear in Ready state.

Conclusion

Joining nodes isn’t just about one command. Kernel settings and small packages matter. Once configured, scaling your cluster is smooth.