Persistency of API server's IP address after cluster reset

Solution Verified - Updated -

Environment

  • Azure Red Hat OpenShift 4

Issue

  • Is it expected see the IP of Cluster API Server to be persistent, even after the ARO cluster reset (delete & recreate) ?

Resolution

  • The IP address allocation is completely random from the Subnet. There is a chance that the first IP in the subnet goes to API Server, but this does not happen in every attempt during cluster creation.

  • The API Server IP is not designed to be static, as documentation says, "The Azure Red Hat OpenShift API shouldn't be accessed through its IP address. Instead, access the Azure Red Hat OpenShift API through its fully qualified domain name (FQDN). Azure DNS resolves the Azure Red Hat OpenShift API FQDN to its IP address."

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