Allow disabling IPv4 address registrations

Author: mpalmer

bridge/bridge.go

@@ -222,14 +222,16 @@ func (b *Bridge) add(containerId string, quiet bool) {
 func (b *Bridge) newServices(port ServicePort, isgroup, quiet bool) []Service {
 	services := make([]Service, 0)
 
-	svc := b.newService(port, isgroup, quiet, false)
+	if b.config.IPv4 {
+		svc := b.newService(port, isgroup, quiet, false)
 
-	if svc != nil {
-		services = append(services, *svc)
+		if svc != nil {
+			services = append(services, *svc)
+		}
 	}
 
 	if b.config.IPv6 && port.container.NetworkSettings.GlobalIPv6Address != "" {
-		svc = b.newService(port, isgroup, quiet, true)
+		svc := b.newService(port, isgroup, quiet, true)
 
 		if svc != nil {
 			services = append(services, *svc)

bridge/types.go

@@ -22,6 +22,7 @@ type RegistryAdapter interface {
 type Config struct {
 	HostIp          string
 	Internal        bool
+	IPv4            bool
 	IPv6            bool
 	ForceTags       string
 	RefreshTtl      int

registrator.go

@@ -21,6 +21,7 @@ var versionChecker = usage.NewChecker("registrator", Version)
 var hostIp = flag.String("ip", "", "IP for ports mapped to the host")
 var internal = flag.Bool("internal", false, "Use internal ports instead of published ones")
 var ipv6 = flag.Bool("ipv6", false, "Register services with container IPv6 addresses, if available")
+var ipv4 = flag.Bool("ipv4", true, "Register services with IPv4 addresses")
 var refreshInterval = flag.Int("ttl-refresh", 0, "Frequency with which service TTLs are refreshed")
 var refreshTtl = flag.Int("ttl", 0, "TTL for services (default is no expiry)")
 var forceTags = flag.String("tags", "", "Append tags for all registered services")
@@ -99,6 +100,7 @@ func main() {
 	b, err := bridge.New(docker, flag.Arg(0), bridge.Config{
 		HostIp:          *hostIp,
 		Internal:        *internal,
+		IPv4:            *ipv4,
 		IPv6:            *ipv6,
 		ForceTags:       *forceTags,
 		RefreshTtl:      *refreshTtl,