Added 'containers' target
diff --git a/xos/configurations/cord/Makefile b/xos/configurations/cord/Makefile
index c95d9dd..41bb37f 100644
--- a/xos/configurations/cord/Makefile
+++ b/xos/configurations/cord/Makefile
@@ -14,6 +14,10 @@
 	sudo MYIP=$(MYIP) docker-compose run xos python /opt/xos/tosca/run.py padmin@vicci.org /opt/xos/configurations/cord/cord.yaml
 	sudo MYIP=$(MYIP) docker-compose run xos python /opt/xos/tosca/run.py padmin@vicci.org /opt/xos/configurations/cord/ceilometer.yaml
 
+containers:
+	cd ../../../containers/xos; make devel
+	cd ../../../containers/synchronizer; make
+
 common_cloudlab:
 	make -C ../common -f Makefile.cloudlab
 
diff --git a/xos/configurations/devel/Makefile b/xos/configurations/devel/Makefile
index b4f3fcf..1e650f3 100644
--- a/xos/configurations/devel/Makefile
+++ b/xos/configurations/devel/Makefile
@@ -10,6 +10,10 @@
 	sudo MYIP=$(MYIP) docker-compose run xos python /opt/xos/tosca/run.py padmin@vicci.org /opt/xos/configurations/common/base.yaml
 	sudo MYIP=$(MYIP) docker-compose run xos python /opt/xos/tosca/run.py padmin@vicci.org /root/setup/nodes.yaml
 
+containers:
+	cd ../../../containers/xos; make devel
+	cd ../../../containers/synchronizer; make
+
 common_cloudlab:
 	make -C ../common -f Makefile.cloudlab
 
@@ -40,5 +44,5 @@
 rebuild_xos:
 	make -C ../../../containers/xos devel
 
-rebuild_synchronizer: 
+rebuild_synchronizer:
 	make -C ../../../containers/synchronizer
diff --git a/xos/configurations/frontend/Makefile b/xos/configurations/frontend/Makefile
index 4c95f90..130153a 100644
--- a/xos/configurations/frontend/Makefile
+++ b/xos/configurations/frontend/Makefile
@@ -6,6 +6,9 @@
 	bash ../common/wait_for_xos.sh
 	sudo docker-compose run xos python /opt/xos/tosca/run.py padmin@vicci.org /opt/xos/configurations/frontend/sample.yaml
 
+containers:
+	cd ../../../containers/xos; make devel
+
 stop:
 	sudo docker-compose stop
 
diff --git a/xos/configurations/test/Makefile b/xos/configurations/test/Makefile
index a79e322..adf349a 100644
--- a/xos/configurations/test/Makefile
+++ b/xos/configurations/test/Makefile
@@ -12,6 +12,10 @@
 	sudo MYIP=$(MYIP) docker-compose run xos bash -c "cd /opt/xos/tosca/tests; python ./alltests.py"
 	sudo MYIP=$(MYIP) docker-compose run xos bash -c "cd /opt/xos/tosca/tests; python ./allObserverTests.py"
 
+containers:
+	cd ../../../containers/xos; make devel
+	cd ../../../containers/synchronizer; make
+
 common_cloudlab:
 	make -C ../common -f Makefile.cloudlab
 
diff --git a/xos/configurations/vtn/Makefile b/xos/configurations/vtn/Makefile
index 59feb2d..335f83d 100644
--- a/xos/configurations/vtn/Makefile
+++ b/xos/configurations/vtn/Makefile
@@ -12,6 +12,10 @@
 	sudo MYIP=$(MYIP) docker-compose run xos python /opt/xos/tosca/run.py padmin@vicci.org /root/setup/nodes.yaml
 	sudo MYIP=$(MYIP) docker-compose run xos python /opt/xos/tosca/run.py padmin@vicci.org /opt/xos/tosca/samples/vtn.yaml
 
+containers:
+	cd ../../../containers/xos; make devel
+	cd ../../../containers/synchronizer; make
+
 common_cloudlab:
 	make -C ../common -f Makefile.cloudlab