Added service name to dockerData struct.

In Swarm mode with with Docker Swarm’s Load Balancer disabled (traefik.backend.loadbalancer.swarm=false)
service name will be the name of the docker service and name will be the container task name
(e.g. whoami0.1).  When generating backend and fronted rules, we will use service name instead of name if a
rule is not provided.

Initialize dockerData.ServiceName to dockerData.Name to support non-swarm mode.

docs/user-guide/swarm-mode.md

@@ -120,16 +120,12 @@ docker-machine ssh manager "docker service create \
 	--name whoami0 \
 	--label traefik.port=80 \
 	--network traefik-net \
-	--label traefik.frontend.rule=Host:whoami0.traefik \
-	--label traefik.backend=whoami0 \
 	emilevauge/whoami"
 
 docker-machine ssh manager "docker service create \
 	--name whoami1 \
 	--label traefik.port=80 \
 	--network traefik-net \
-	--label traefik.frontend.rule=Host:whoam1.traefik \
-	--label traefik.backend=whoami1 \
 	--label traefik.backend.loadbalancer.sticky=true \
 	emilevauge/whoami"
 ```

provider/docker.go

@@ -52,6 +52,7 @@ type Docker struct {
 
 // dockerData holds the need data to the Docker provider
 type dockerData struct {
+	ServiceName     string
 	Name            string
 	Labels          map[string]string // List of labels set to container or service
 	NetworkSettings networkSettings
@@ -393,14 +394,14 @@ func (provider *Docker) getFrontendRule(container dockerData) string {
 	if label, err := getLabel(container, "traefik.frontend.rule"); err == nil {
 		return label
 	}
-	return "Host:" + provider.getSubDomain(container.Name) + "." + provider.Domain
+	return "Host:" + provider.getSubDomain(container.ServiceName) + "." + provider.Domain
 }
 
 func (provider *Docker) getBackend(container dockerData) string {
 	if label, err := getLabel(container, "traefik.backend"); err == nil {
 		return normalize(label)
 	}
-	return normalize(container.Name)
+	return normalize(container.ServiceName)
 }
 
 func (provider *Docker) getIPAddress(container dockerData) string {
@@ -559,6 +560,7 @@ func parseContainer(container dockertypes.ContainerJSON) dockerData {
 
 	if container.ContainerJSONBase != nil {
 		dockerData.Name = container.ContainerJSONBase.Name
+		dockerData.ServiceName = dockerData.Name //Default ServiceName to be the container's Name.
 
 		if container.ContainerJSONBase.HostConfig != nil {
 			dockerData.NetworkSettings.NetworkMode = container.ContainerJSONBase.HostConfig.NetworkMode
@@ -641,6 +643,7 @@ func (provider *Docker) listServices(ctx context.Context, dockerClient client.AP
 
 func parseService(service swarmtypes.Service, networkMap map[string]*dockertypes.NetworkResource) dockerData {
 	dockerData := dockerData{
+		ServiceName:     service.Spec.Annotations.Name,
 		Name:            service.Spec.Annotations.Name,
 		Labels:          service.Spec.Annotations.Labels,
 		NetworkSettings: networkSettings{},
@@ -691,6 +694,7 @@ func listTasks(ctx context.Context, dockerClient client.APIClient, serviceID str
 
 func parseTasks(task swarmtypes.Task, serviceDockerData dockerData, networkMap map[string]*dockertypes.NetworkResource) dockerData {
 	dockerData := dockerData{
+		ServiceName:     serviceDockerData.Name,
 		Name:            serviceDockerData.Name + "." + strconv.Itoa(task.Slot),
 		Labels:          serviceDockerData.Labels,
 		NetworkSettings: networkSettings{},