Implementing NEWTAG, code optimization

Jenkinsfile

@@ -58,12 +58,16 @@ pipeline {
       when { expression { service_update != "" } }
       steps {
         script {
+          def CLUSTER_TGT
+          echo "Cluster is $cluster"
           switch (cluster) {
              case 'prod':
-                CLUSTER=CLUSTER_PROD
+                CLUSTER_TGT=CLUSTER_PROD
+                echo "prod - $CLUSTER_TGT"
                 break
              case 'dev':
-                CLUSTER=CLUSTER_DEV
+                CLUSTER_TGT=CLUSTER_DEV
+                echo "dev - $CLUSTER_TGT"
                 break
              default:
                 currentBuild.result = 'ABORTED'
@@ -71,10 +75,10 @@ pipeline {
           }
           for (String item : service_update.split()) {
             try{
-              echo "Updating $item"
+              echo "Updating $item, cluster $CLUSTER_TGT"
               withEnv(["service_name=${item}"]) {
                   sh '''export DOCKER_CERT_PATH=/run/secrets/swarm
-                        export DOCKER_HOST=tcp://${CLUSTER}:2376 DOCKER_TLS_VERIFY=1
+                        export DOCKER_HOST=tcp://${CLUSTER_TGT}:2376 DOCKER_TLS_VERIFY=1
                         docker service update ${service_name} --image ${DOCKER_REGISTRY}/iru/${DOCKER_IMAGE}:${NEWTAG}
                       '''
                 }
@@ -83,7 +87,7 @@ pipeline {
               echo "Recovering service $item"
               withEnv(["service_name=${item}"]) {
                   sh '''export DOCKER_CERT_PATH=/run/secrets/swarm
-                        export DOCKER_HOST=tcp://${CLUSTER}:2376 DOCKER_TLS_VERIFY=1
+                        export DOCKER_HOST=tcp://${CLUSTER_TGT}:2376 DOCKER_TLS_VERIFY=1
                         docker service rollback ${service_name}
                      '''
               }