fix swarm script for multiple VCAC-As

VCAC-A/README.md

@@ -66,6 +66,8 @@ You can setup the VCAC-A as a docker swarm worker node. Any subsequent deploymen
 
 Run the [setup_swarm.sh](./script/setup_swarm.sh) script on the host to setup docker swarm. The script initializes the host as a swarm master and labels the VCAC-A with `vcac_zone=yes`.   
 
+> The Docker Swarm mode is limited to a single VCAC-A on a host system, (because `docker swarm init` must bind to a specific network interface,) unless you use the [WeaveNet](#setup-weavenet) workaround. In such a case, initialize docker swarm with `./setup_swarm.sh $(/usr/local/bin/weave expose)`.   
+
 #### Develop Docker-Compose Script:
 
 Docker Compose File Format version 3 does not support device mount. We need to use the [docker-in-docker](https://hub.docker.com/_/docker) workaround (to be able to mount the media and analytics devices.) The workaround launches a privileged docker container that subsequently runs the application container. The [`vcac-container-launcher:latest`](https://github.com/OpenVisualCloud/Smart-City-Sample/blob/master/analytics/common/VCAC-A/Dockerfile.1.launcher) Dockerfile builds to an enhanced dock-in-docker image that additionally passes on environment variables, mounts network and volumes, and gracefully shutdown.   

VCAC-A/script/setup_swarm.sh

@@ -2,7 +2,7 @@
 
 # setup host docker swarm if not already
 docker swarm leave --force 2> /dev/null || true
-docker swarm init --advertise-addr=$(sudo vcactl config-show |awk '/gateway/{print$2;exit}') 2>/dev/null || true
+docker swarm init --advertise-addr=${1:-$(sudo vcactl config-show |awk '/gateway/{print$2;exit}')} 2>/dev/null || true
 JOINCMD=$(docker swarm join-token worker | grep token)
 
 NODEUSER="root"
@@ -15,9 +15,9 @@ done
 
 # setup node labels
 for id in $(docker node ls -q 2>/dev/null); do
-    nodeip="$(docker node inspect -f {{.Status.Addr}} $id)"
-    if test -n "$(echo $NODES | grep --fixed-strings $nodeip)"; then
-        echo "label $id: vcac_zone=yes"
+    nodename="$(docker node inspect -f {{.Description.Hostname}} $id)"
+    if test -n "$(sudo vcactl config-show | awk -v name=$nodename '/node-name:/&&$2==name{print 1}')"; then
+        echo "label $nodename: vcac_zone=yes"
         docker node update --label-add vcac_zone=yes $id
     fi
 done