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Pod disruption budgetedit
A Pod Disruption Budget allows limiting disruptions on an existing set of Pods while the Kubernetes cluster administrator manages cluster nodes. Elasticsearch makes sure some indices don’t become unavailable.
A default PDB is enforced by default: it allows one Elasticsearch Pod to be taken down as long as the cluster has a green health.
This default can be tweaked in the Elasticsearch specification:
apiVersion: elasticsearch.k8s.elastic.co/{eck_crd_version}
kind: Elasticsearch
metadata:
name: quickstart
spec:
version: 8.11.1
nodeSets:
- name: default
count: 3
podDisruptionBudget:
spec:
minAvailable: 2
selector:
matchLabels:
elasticsearch.k8s.elastic.co/cluster-name: quickstart
Note that maxUnavailable cannot be used with an arbitrary label selector, hence the usage of minAvailable in this example.
The default PDB can also be explicitly disabled:
apiVersion: elasticsearch.k8s.elastic.co/v1alpha1
kind: Elasticsearch
metadata:
name: quickstart
spec:
version: 7.2.0
nodes:
- nodeCount: 3
podDisruptionBudget: {}