From a1b4df92feac3459ce2832d0f2c9838dd2994de0 Mon Sep 17 00:00:00 2001 From: Josephine Pfeiffer Date: Wed, 22 Feb 2023 13:37:03 +0100 Subject: [PATCH] clarified single-az cluster minimum infra nodes Author: Josephine Pfeiffer Date: Wed Feb 22 13:37:03 2023 +0100 On branch rosa-az-nodes Changes to be committed: modified: modules/rosa-policy-failure-points.adoc --- modules/rosa-policy-failure-points.adoc | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/modules/rosa-policy-failure-points.adoc b/modules/rosa-policy-failure-points.adoc index 68505e28c3..f9b427a059 100644 --- a/modules/rosa-policy-failure-points.adoc +++ b/modules/rosa-policy-failure-points.adoc @@ -35,7 +35,9 @@ When accounting for possible node failures, it is also important to understand h [id="rosa-policy-container-cluster-failure_{context}"] == Cluster failure -ROSA clusters have at least three control plane nodes and three infrastructure nodes that are preconfigured for high availability, either in a single zone or across multiple zones, depending on the type of cluster you have selected. Control plane and infrastructure nodes have the same resiliency as worker nodes, with the added benefit of being managed completely by Red Hat. +Single-AZ ROSA clusters have at least three control plane and two infrastructure nodes in the same availability zone (AZ) in the private subnet. + +Multi-AZ ROSA clusters have at least three control plane nodes and three infrastructure nodes that are preconfigured for high availability, either in a single zone or across multiple zones, depending on the type of cluster you have selected. Control plane and infrastructure nodes have the same resiliency as worker nodes, with the added benefit of being managed completely by Red Hat. In the event of a complete control plane outage, the OpenShift APIs will not function, and existing worker node pods are unaffected. However, if there is also a pod or node outage at the same time, the control planes must recover before new pods or nodes can be added or scheduled.