Kubernetes DaemonSets

Kubernetes Daemonset can be used to run replicas of a pod on specific or all nodes.

• https://kubernetes.io/docs/concepts/workloads/controllers/daemonset/
• https://kubernetes.io/docs/concepts/workloads/controllers/replicaset/#daemonset

Typical uses of a DaemonSet are:

• Running a cluster storage daemon on every node
• Running a logs collection daemon on every node
• Running a node monitoring daemon on every node

Official example

https://kubernetes.io/docs/concepts/workloads/controllers/daemonset/

• kind: DaemonSet

Activities

• CKA v1.18: Understand the role of DaemonSets
• Stop DaemonSet: kubectl patch daemonset <name-of-daemon-set> -p '{"spec": {"template": {"spec": {"nodeSelector": {"non-existing": "true"}}}}}'
• kubectl set env ds aws-node -n kube-system WARM_IP_TARGET=5

Related terms

• kubectl api-resources
• kind: DaemonSet
• kubectl get daemonset, kubectl get daemonset -A
• kubectl rollout daemonset
• StatefulSet
• aws-node: kubectl -n kube-system edit daemonset/aws-node
• kubectl describe ds

See also

• DaemonSet, kind: DaemonSet, tolerations:
• Kubernetes DaemonSets, daemonset.apps/, aws-node
• Kubernetes Workloads: Deployment, ReplicaSet, StatefulSet, DaemonSets, Job, CronJob, .apps/