OpenShift DaemonSet Operations

External

• https://docs.openshift.com/container-platform/3.5/dev_guide/daemonsets.html

Internal

• OpenShift Operations
• OpenShift Concepts - DaemonSets

Obtaining Information about DaemonSets

The name of the DaemonSet that manages a pod is available in pod's "oc describe pod" output, as value for the "Controllers:" label. That value can be used to get the DaemonSet definition:

 oc describe DaemonSet/<daemon-set-name>

Example:

 oc describe DaemonSet/logging-fluentd

Name:		logging-fluentd
Image(s):	registry.access.redhat.com/openshift3/logging-fluentd:3.5.0
Selector:	component=fluentd,provider=openshift
Node-Selector:	logging-infra-fluentd=true
Labels:		component=fluentd
		logging-infra=fluentd
		provider=openshift
Desired Number of Nodes Scheduled: 7
Current Number of Nodes Scheduled: 7
Number of Nodes Misscheduled: 0
Pods Status:	2 Running / 0 Waiting / 0 Succeeded / 5 Failed
No events.

Creating Daemon Sets

TODO: https://docs.openshift.com/container-platform/3.5/dev_guide/daemonsets.html#dev-guide-creating-daemonsets

Updating Daemon Sets

Currently, updating a daemonset’s pod template does not affect existing pod replicas. Moreover, if you delete a daemonset and then create a new daemonset with a different template but the same label selector, it will recognize any existing pod replicas as having matching labels and thus will not update them or create new replicas despite a mismatch in the pod template.

To update a daemonset, force new pod replicas to be created by deleting the old replicas or nodes.