Chapter 11. DaemonSets

Question 1

What is a DaemonSet ?

Answer 1

A DaemonSet ensures a copy of a Pod is running across a set of nodes in a Kubernetes cluster. DaemonSets are used to deploy system daemons such as log collectors and monitoring agents, which typically must run on every node. DaemonSets share similar functionality with ReplicaSets; both create Pods that are expected to be long-running services and ensure that the desired state and the observed state of the cluster match.

Question 2

When Shall we use DaemonSet ?

Answer 2

DaemonSets should be used when a single copy of your application must run on all or a subset of the nodes in the cluster.

Question 3

When shall we use ReplicaSet ?

Answer 3

ReplicaSets should be used when your application is completely decoupled from the node and you can run multiple copies on a given node without special consideration.