Do not add names to ingress network

Do not add service discovery names to ingress network as this is a
routing only network and no intra-cluster discovery should happen in
that network. This fixes the ambiguity and resolving names between
services which are both publishing ports and also attached to same
another network.

Signed-off-by: Jana Radhakrishnan <mrjana@docker.com>

libnetwork/network.go

@@ -1059,6 +1059,12 @@ func delNameToIP(svcMap map[string][]net.IP, name string, epIP net.IP) {
 }
 
 func (n *network) addSvcRecords(name string, epIP net.IP, epIPv6 net.IP, ipMapUpdate bool) {
+	// Do not add service names for ingress network as this is a
+	// routing only network
+	if n.ingress {
+		return
+	}
+
 	c := n.getController()
 	c.Lock()
 	defer c.Unlock()
@@ -1086,6 +1092,12 @@ func (n *network) addSvcRecords(name string, epIP net.IP, epIPv6 net.IP, ipMapUp
 }
 
 func (n *network) deleteSvcRecords(name string, epIP net.IP, epIPv6 net.IP, ipMapUpdate bool) {
+	// Do not delete service names from ingress network as this is a
+	// routing only network
+	if n.ingress {
+		return
+	}
+
 	c := n.getController()
 	c.Lock()
 	defer c.Unlock()