DaemonSets are used to manage the creation of a particular Pod on all or a selected set of nodes in a cluster. If we configure a DaemonSet to create Pods on all nodes, then if new nodes are added to the cluster, new pods will be created to run on these new nodes. Similarly, if some nodes are removed from the cluster, the Pods running on these nodes will be destroyed.
Use Cases for DaemonSets
- Logging: One of the most common use cases for a DaemonSet is to manage running a log collection Pod on all nodes. These Pods can be used to collect logs from all the nodes and then process them in a log processing pipeline.
- Local data caching: A DaemonSet can also be used to manage caching Pods on all the nodes. These Pods can be used by other application Pods to store the cached data temporarily.
- Monitoring: Another use case for a DaemonSet is to manage running monitoring Pods on all the nodes. This can be used to collect system- or application-level metrics for Pods...