Code optimization errors

Jenkinsfile

@@ -79,7 +79,8 @@ pipeline {
         script {
           for (String item : service_update.split()) {
             try{
-               sh "docker service update ${service_name} --image ${DOCKER_REGISTRY}/iru/${DOCKER_IMAGE}:${NEWTAG}"
+               echo "Updating ${item}"
+               sh "docker service update ${item} --image ${DOCKER_REGISTRY}/iru/${DOCKER_IMAGE}:${NEWTAG}"
             }
             catch(err){
                echo "Recovering service $item"