Kubernetes: Up and Running by Kelsey Hightower Brendan Burns & Joe Beda

Author:Kelsey Hightower, Brendan Burns & Joe Beda
Language: eng
Format: epub
Publisher: O'Reilly Media, Inc.
Published: 2017-09-12T04:00:00+00:00

DaemonSet Scheduler

By default a DaemonSet will create a copy of a Pod on every node unless a node selector is used, which will limit eligible nodes to those with a matching set of labels. DaemonSets determine which node a Pod will run on at Pod creation time by specifying the nodeName field in the Pod spec. As a result, Pods created by DaemonSets are ignored by the Kubernetes scheduler.

Like ReplicaSets, DaemonSets are managed by a reconciliation control loop that measures the desired state (a Pod is present on all nodes) with the observed state (is the Pod present on a particular node?). Given this information, the DaemonSet controller creates a Pod on each node that doesn’t currently have a matching Pod.

If a new node is added to the cluster, then the DaemonSet controller notices that it is missing a Pod and adds the Pod to the new node.

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