diff options
Diffstat (limited to 'middleware/kubernetes/reverse.go')
| -rw-r--r-- | middleware/kubernetes/reverse.go | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/middleware/kubernetes/reverse.go b/middleware/kubernetes/reverse.go index 62b3a7043..eac5a0b04 100644 --- a/middleware/kubernetes/reverse.go +++ b/middleware/kubernetes/reverse.go @@ -1,6 +1,8 @@ package kubernetes import ( + "strings" + "github.com/coredns/coredns/middleware" "github.com/coredns/coredns/middleware/etcd/msg" "github.com/coredns/coredns/middleware/pkg/dnsutil" @@ -18,3 +20,36 @@ func (k *Kubernetes) Reverse(state request.Request, exact bool, opt middleware.O records := k.serviceRecordForIP(ip, state.Name()) return records, nil, nil } + +// serviceRecordForIP gets a service record with a cluster ip matching the ip argument +// If a service cluster ip does not match, it checks all endpoints +func (k *Kubernetes) serviceRecordForIP(ip, name string) []msg.Service { + // First check services with cluster ips + svcList := k.APIConn.ServiceList() + + for _, service := range svcList { + if (len(k.Namespaces) > 0) && !k.namespaceExposed(service.Namespace) { + continue + } + if service.Spec.ClusterIP == ip { + domain := strings.Join([]string{service.Name, service.Namespace, Svc, k.primaryZone()}, ".") + return []msg.Service{{Host: domain}} + } + } + // If no cluster ips match, search endpoints + epList := k.APIConn.EndpointsList() + for _, ep := range epList.Items { + if (len(k.Namespaces) > 0) && !k.namespaceExposed(ep.ObjectMeta.Namespace) { + continue + } + for _, eps := range ep.Subsets { + for _, addr := range eps.Addresses { + if addr.IP == ip { + domain := strings.Join([]string{endpointHostname(addr), ep.ObjectMeta.Name, ep.ObjectMeta.Namespace, Svc, k.primaryZone()}, ".") + return []msg.Service{{Host: domain}} + } + } + } + } + return nil +} |