README.md

Daemonset in Kubernetes

What is a daemonset?

• A DaemonSet in Kubernetes is a workload controller that ensures a pod runs on all or some nodes in a cluster
• Example: If you create a daemonset in a cluster of 3 nodes, then 3 pods will be created. No need to manage replicas.
• If you add another node to the cluster, a new pod will be automatically created on the new node.

How it works

• A DaemonSet controller monitors for new and deleted nodes, and adds or removes pods as needed.

What it's used for

• Logging collection
• Kube-proxy
• Weave-net
• Node monitoring

Example of Daemonset:

• In the above screenshot, you can see 2 daemonsets are deployed in the kube-system namespace. i.e, Canal and Kube-proxy.
• Similarily, we can also create custom daemonset by following below steps.

Steps to deploy daemonset:

• You will see 1 manifest in the same directory (DaemonSet) with name daemonset-deploy.yaml.
• Copy the content of the manifest and run the following command to deploy it.

kubectl apply -f daemonset-deploy.yaml

• After applying, you will see the daemonset pods are created and replicas are equal to the number of nodes including control-plane.