Unable to add an Availability-Zone in Multi-Zone cluster after the cluster is created
Environment
- Red Hat OpenShift Service on AWS (ROSA)
- 4
Issue
- Is it possible to add an Availability-Zone (AZ) in Multi-Zone cluster after the cluster is created using machine pool.
- Can we add more than 3 AZ's while creating cluster.
Resolution
-
If Cluster is not a
byo-VPC
cluster, then the AZ's selected during install-time are the only ones that can be used. It is possible to add AZ after the creation of cluster only if it is abyo-VPC
cluster, and subnetting is accounted for. -
Without
byo-VPC
, when ROSA creates the VPC, it chops the VPC into equal subnets and assumes AZ's to the subnets , so there's no more addresses in the VPC to apply to AZ's at that point. -
It is not possible to add more than 3 AZ's while creating cluster if it's not a
byo-VPC
cluster and should be usingbyo-VPC
to resolve it.
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