ege's wiki

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$ cat wiki/kubernetes/hostnames-with-multiple-headless-services.md

Hostnames With Multiple Headless Services

updated 
$ k get pod cluster1-mysql-0 -o yaml | grep subdomain
  subdomain: cluster1-mysql

Kubernetes has a check to match subdomain to service name:

func ShouldSetHostname(pod *v1.Pod, svc *v1.Service) bool {  
    return len(pod.Spec.Hostname) > 0 && pod.Spec.Subdomain == svc.Name && svc.Namespace == pod.Namespace  
}

That's why resolving cluster1-mysql-0.cluster1-mysql.default.svc.cluster.local works but cluster1-mysql-0.cluster1-mysql-unready.default.svc.cluster.local not.