Managing Nodes in k8s - Join , Cordon , Drain
In this blog post, we will explore essential node management operations, including joining nodes, creating nodes, deleting nodes, and cordoning nodes.
Synopsis:
- Joining Nodes
- Cordoning Nodes
- Draining Nodes
Joining Nodes to a Kubernetes Cluster
- Log in to the master node of your Kubernetes cluster where you have
kubeadminstalled. - Use the
kubeadm token createcommand to generate a new token. You can optionally set an expiration time for the token.
kubeadm token create --print-join-command
3. The generated token and the associated join command allow worker nodes to securely join the Kubernetes cluster
#Replace with your node and port
kubeadm join --token token master-node-ip:port
Deleting Nodes in Kubernetes
Use the kubectl delete node command to delete the node.
kubectl delete node node-name
Cordoning and Draining Nodes
To prevent new pods from being scheduled on a node, run the following command:
kubectl cordon node-name
To safely evict existing pods from the node, use the kubectl drain command:
kubectl drain node-name --force --ignore-daemonsets
Whether you need to join, create, delete, or cordon nodes, these operations are essential for scaling and maintaining your containerized applications. Feel free to refer k8s official docs: https://kubernetes.io/docs/home/
