DaemonSet
A DaemonSet is a Kubernetes resource that ensures a copy of a pod runs on all or some nodes in a cluster, typically used for system-level services like logging, monitoring, or storage. It automatically creates and manages pods on nodes as they are added or removed, maintaining the desired state across the cluster. This is essential for deploying background tasks that need to run on every node to provide cluster-wide functionality.
Developers should use DaemonSets when they need to run a pod on every node in a Kubernetes cluster, such as for log collection agents (e.g., Fluentd), monitoring agents (e.g., Prometheus Node Exporter), or network plugins (e.g., Calico). It ensures high availability and consistency for system services without manual intervention, making it ideal for infrastructure-level components that support the entire cluster's operation.