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.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-03-10 UTC."],[[["The current version of the Apigee hybrid documentation being viewed, version 1.4, is end-of-life and requires an upgrade to a newer version."],["To prevent issues with draining Istio pods, ensure that the minimum replica count for each relevant property is set to at least 3."],["When draining Istio nodes, errors may occur due to PodDisruptionBudget definitions, particularly with `istio-ingressgateway` and `istio-pilot`."],["Setting the `istio.ingressgateway.replicaCountMin` and `istio.pilot.replicaCountMin` properties to 3 or higher can resolve issues during the draining process."],["For Istio components that do not have a replicaCountMin property, refer to the GKE or Istio documentation on how to proceed."]]],[]]
