Before blaming an application bug, a 911 platform team wants to confirm that one Service can resolve another Service by DNS inside the cluster. Which component should they verify is healthy?
Select an answer to reveal the explanation.
Short Explanation
If apps can't find each other by name, check the cluster phone book — CoreDNS — before rewriting the app.
Full Explanation
Kubernetes Service discovery for in-cluster clients relies on DNS records served by CoreDNS (historically kube-dns). Resolving svc.namespace.svc.cluster.local (or short names within a namespace) validates that discovery networking is intact before application logic is blamed. metrics-server, cloud-controller-manager, and etcd compaction are not the Service DNS providers.