I'd like to create a wildcard DNS record that maps to a virtual IP inside my k8s cluster. This is because I want requests from my pods to any subdomain of a given name to map to a specific set of endpoints. I.e. requests from:
something.my-service.my-namespace.svc.cluster.local
something-else.my-service.my-namespace.svc.cluster.local
any-old-thing-my-pod-came-up-with.my-service.my-namespace.svc.cluster.local
to all resolve to the same virtual IP, and therefore to the same cluster (i.e. I would like these requests to be routed to endpoints in the same way a service does).
I've seen some other solutions that involve creating and modifying the cluster DNS service (i.e. kube-dns or CoreDNS) config. This doesn't work for me- the main reason I'm asking this question is to achieve declarative config.
What I've tried:
- Service
.metadata.name: '*.my-service'. Failed because'*.my-service'is not a valid service name. - Service
.spec.ports.name: '*'. Not a valid port name.
Not an option:
- Ingress. I cannot expose these services to the wider internet.
- Pod hostname/subdomain. AFAIK DNS entries created by pod hostname/subdomain will not have a virtual IP that may resolve to any of a number of pods. (Quoting from https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/#pod-s-hostname-and-subdomain-fields) "DNS serves an A record at that name, pointing to the Pod’s IP."
