If you are not familiar with the oc command, refer to OpenShift - Getting Started with the oc command

When nodes are down, perhaps for maintenance or due to some unexpected issue, the pods running on the nodes are killed via SIGKILL and scheduled to run on another node. With Pod Disruption Budgets, the eviction and termination of a pod from a node is more graceful.

1. Gracefully terminate any connections to the pod
2. Send SIGTERM to the pods containers so that the containers can gracefully terminate and shut down
3. If the containers in the pod does not gracefully terminate and shut down after a period of time, SIGKILL will be sent to the containers to kill the containers, forcing them to shut down

The oc get PodDisruptionBudgets command can be used to list Pod Distribution Budgets in the currently selected namespace, or using the --namespace option to list the Pod Disruption Budgets in a particular namespace.

~]$ oc get PodDisruptionBudgets --namespace my-namespace
NAME                       MIN AVAILABLE   MAX UNAVAILABLE   ALLOWED DISRUPTIONS   AGE
my-pod-disruption-budget   1               N/A               0                     26s

Or the -A or --all-namespaces command can be used to list the Pod Distribution Budgets in all namespaces.

~]$ oc get PodDisruptionBudgets --all-namespaces
NAMESPACE                              NAME                                 MIN AVAILABLE   MAX UNAVAILABLE   ALLOWED DISRUPTIONS   AGE
openshift-apiserver                    openshift-apiserver-pdb              N/A             1                 1                     300d
openshift-cluster-storage-operator     csi-snapshot-controller-pdb          N/A             1                 1                     300d
openshift-cluster-storage-operator     csi-snapshot-webhook-pdb             N/A             1                 1                     300d
openshift-etcd                         etcd-quorum-guard                    N/A             1                 1                     300d
openshift-image-registry               image-registry                       1               N/A               2                     300d
openshift-ingress                      router-default                       N/A             50%               2                     2y229d
openshift-ingress                      router-external-router               N/A             50%               1                     2y228d
openshift-ingress                      router-internal-router               N/A             50%               1                     2y228d
openshift-kube-apiserver               kube-apiserver-guard-pdb             2               N/A               1                     224d
openshift-kube-controller-manager      kube-controller-manager-guard-pdb    2               N/A               1                     224d
openshift-kube-scheduler               openshift-kube-scheduler-guard-pdb   2               N/A               1                     224d
openshift-monitoring                   alertmanager-main                    N/A             1                 1                     224d
openshift-monitoring                   prometheus-adapter                   1               N/A               1                     300d
openshift-monitoring                   prometheus-k8s                       1               N/A               1                     224d
openshift-monitoring                   thanos-querier-pdb                   1               N/A               1                     300d
openshift-oauth-apiserver              oauth-apiserver-pdb                  N/A             1                 1                     300d
openshift-operator-lifecycle-manager   packageserver-pdb                    N/A             1                 1                     224d