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Node management

Outcomes

  • Understand the role of a node in a Kubernetes cluster
  • Understand how to add and remove nodes from a cluster
  • Understand how to configure nodes
  • Understand how to manage nodes
  • Cordon and uncordon nodes
  • Drain nodes

Outline

A node is a physical or virtual machine on which pods and other resources that underpin your workload run. Each node is managed by a master node known as a control pane which contains multiple services required to run pods. A cluster typically has multiple nodes.

To get the number of nodes on your cluster, run:

$ kubectl get nodes
List Nodes in Kubernetes Cluster
List Nodes in Kubernetes Cluster
To get the pods running on a node, execute:

$ kubectl get pods -o wide | grep <node_name>
List Pods Running on Kubernetes Cluster
List Pods Running on Kubernetes Cluster
To mark your node as unschedulable, run.

$ kubectl cordon minikube

node/minikube cordoned
To mark your node as schedulable, run.

$ kubectl uncordon minikube

node/minikube uncordoned
To display resource usage metrics such as RAM and CPU run:
$ kubectl top node <node_name>
To delete a node or multiple nodes, run the command:

$ kubectl delete node <node_name>