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You are automating the deployment of a highly available OKE cluster across multiple availability domains (ADs) using Terraform. The OKE cluster needs to communicate with a database service running on a Compute instance in a separate private subnet within the same VCN. During the Terraform deployment, you encounter an error indicating that the Kubernetes pods cannot resolve the private IP address of the database instance. You've verified that DNS resolution works correctly for other resources within the VCN. What is the MOST probable reason for this DNS resolutionfailure?
Correct Answer: A
* Problem: OKE pods can't resolve private DB IP despite VCN DNS working. * Option A: CoreDNS in OKE must forward to VCN's resolver for private IPs; misconfiguration is a common issue-correct. * Option B: Security lists block traffic, not resolution; VCN DNS isn't hosted on the DB-incorrect. * Option C: Public endpoint affects API access, not internal DNS-incorrect. * Option D: Route tables don't control DNS resolution-incorrect. * Conclusion: Option A is the most probable cause. Oracle notes: * "CoreDNS in OKE must be configured to forward queries to the VCN's DNS resolver (.169 address) for private IP resolution."This supports Option A. Reference:OKE DNS Configuration - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/ContEng/Tasks/contengdns.htm).
