Create and Manage Kubernetes DaemonSets¶

Let's see how you can create and manage kubernetes Daemonsets. For this demonstration, let's assume there is a need to run an nginx server on each node. In the real world, your requirements might differ depending on your use case.

Step 1: Create DaemonSet Manifest¶

First, we need to write the DaemonSet manifest as follows:

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apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: nginx-daemonset
spec:
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:latest
        ports:
        - containerPort: 80

Required fields:

• apiVersion - Which version of the Kubernetes API you're using to create this object.
• kind - What kind of object you want to create.
• metadata - Data that helps uniquely identify the object, including a name string, UID , and - optional namespace.
• spec - What state you desire for the object.

Step 2: Create DaemonSet¶

Let's use kubectl apply to apply the manifest and create the DaemonSet:

# Create daemonset
kubectl apply -f my-daemonset.yml

Step 3: List DaemonSets and Pods¶

kubectl get daemonsets
{OR}
kubectl get daemonset
{OR}
kubectl get ds

Also, list pods and verify if they are running on all the nodes in the cluster:

kubectl get pods -o wide

You'll that a copy of the pod is running on all the nodes in the cluster.

Step 4: Delete DaemonSet¶

# Delete the daemonset
kubectl delete -f my-daemonset.yml

This will delete the DaemonSet and pods managed by the DaemonSet.