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When draining Istio pods some nodes may not drain because they have a replica
count of 1, while 3 or more replicas are required.
In order to avoid this, you should set the minimum replica count for each
property to at least 3.
When backing up and draining Istio nodes you may see errors like:
kubectl drain` failed to evict and reschedule pods to another node due to PodDisruptionBudget definitions: === NAMESPACE NAME MIN AVAILABLE MAX UNAVAILABLE ALLOWED DISRUPTIONS AGE istio-system istio-ingressgateway 1 N/A 2 5d11h istio-system istio-pilot 1 N/A 2 5d11h ===
For istio-ingressgateway and istio-pilot you can set
the istio.ingressgateway.replicaCountMin and
istio.pilot.replicaCountMin properties to 3
or higher. See the
Configuration properties reference, istio.
For other istio components (that don't have a
replicaCountMin property), see
Manually upgrading a cluster or node pool in the GKE documentation or
IstioOperator Options in the Istio documentation.