[Solved] You tried to join a new master node to your HA cluster using this command: kubeadm join lb.example.com:6443 --token abcdef.... | Kubernetes

Kubernetes - Production Best Practices

You tried to join a new master node to your HA cluster using this command:

kubeadm join lb.example.com:6443 --token abcdef.0123456789abcdef --discovery-token-ca-cert-hash sha256:12345

But it failed with an error about missing --control-plane flag. What is the correct fix?

ARemove the token from the command

BAdd the <code>--control-plane</code> flag to the join command

CUse <code>kubeadm init</code> instead of join

DChange the port number to 8080

Step-by-Step Solution

Solution:

Step 1: Identify the error cause
Joining a master node requires the --control-plane flag to indicate it is a control plane node.
Step 2: Apply the fix
Add --control-plane to the join command to fix the error.
Final Answer:
Add the --control-plane flag to the join command -> Option B
Quick Check:
Joining master needs --control-plane flag [OK]

Quick Trick: Joining master nodes requires --control-plane flag [OK]

Common Mistakes:

Master "Production Best Practices" in Kubernetes

9 interactive learning modes - each teaches the same concept differently

More Kubernetes Quizzes

You tried to join a new master node to your HA cluster using this command: