diff --git a/tools/gce_setup/private_build_and_test.sh b/tools/gce_setup/private_build_and_test.sh
index bab27b5fa31..9c5c347a304 100755
--- a/tools/gce_setup/private_build_and_test.sh
+++ b/tools/gce_setup/private_build_and_test.sh
@@ -15,12 +15,15 @@ LANGUAGE=$1
 ENV=$2
 TEST=$3
 GIT=$4
-SERVER=${5:-"grpc-docker-server"}
+PROJECT=${5:-"stoked-keyword-656"}
+ZONE=${6:-"asia-east1-a"}
+CLIENT=${7:-"grpc-docker-testclients1"}
+SERVER=${8:-"grpc-docker-server"}
 
 current_time=$(date "+%Y-%m-%d-%H-%M-%S")
 result_file_name=private_result.$current_time.txt
 
-sudo docker run --name="private_images" -v $4:/var/local/git-clone grpc/$1 /var/local/git-clone/grpc/tools/dockerfile/grpc_$1/build.sh
+sudo docker run --name="private_images" -v $GIT:/var/local/git-clone grpc/$LANGUAGE /var/local/git-clone/grpc/tools/dockerfile/grpc_$LANGUAGE/build.sh
 
 sudo docker commit -m "private image" -a $USER private_images grpc/private_images
 
@@ -32,27 +35,27 @@ sudo docker rmi -f grpc/private_images
 
 sudo docker rm private_images
 
-gcloud compute --project "stoked-keyword-656" ssh --zone "asia-east1-a" "grpc-docker-testclients1" --command "sudo docker pull 0.0.0.0:5000/grpc/private_images"
+gcloud compute --project $PROJECT ssh --zone $ZONE $CLIENT --command "sudo docker pull 0.0.0.0:5000/grpc/private_images"
 
-gcloud compute --project "stoked-keyword-656" ssh --zone "asia-east1-a" "grpc-docker-testclients1" --command "sudo docker tag 0.0.0.0:5000/grpc/private_images grpc/$1"
+gcloud compute --project $PROJECT ssh --zone $ZONE $CLIENT --command "sudo docker tag 0.0.0.0:5000/grpc/private_images grpc/$LANGUAGE"
 
 source grpc_docker.sh
 
 if [ $ENV == 'interop' ]
 then
-  grpc_interop_test $TEST grpc-docker-testclients1 $LANGUAGE $SERVER cxx
-  grpc_interop_test $TEST grpc-docker-testclients1 $LANGUAGE $SERVER java
-  grpc_interop_test $TEST grpc-docker-testclients1 $LANGUAGE $SERVER go
-  grpc_interop_test $TEST grpc-docker-testclients1 $LANGUAGE $SERVER ruby
-  grpc_interop_test $TEST grpc-docker-testclients1 $LANGUAGE $SERVER node
-  grpc_interop_test $TEST grpc-docker-testclients1 $LANGUAGE $SERVER python
+  grpc_interop_test $TEST $CLIENT $LANGUAGE $SERVER cxx
+  grpc_interop_test $TEST $CLIENT $LANGUAGE $SERVER java
+  grpc_interop_test $TEST $CLIENT $LANGUAGE $SERVER go
+  grpc_interop_test $TEST $CLIENT $LANGUAGE $SERVER ruby
+  grpc_interop_test $TEST $CLIENT $LANGUAGE $SERVER node
+  grpc_interop_test $TEST $CLIENT $LANGUAGE $SERVER python
 else
   if [ $ENV == 'cloud' ]
   then
-    grpc_cloud_prod_test $TEST grpc-docker-testclients1 $LANGUAGE > /tmp/$result_file_name 2>&1
-    gsutil cp /tmp/$result_file_name gs://stoked-keyword-656-output/private_result/$result_file_name
+    grpc_cloud_prod_test $TEST $CLIENT $LANGUAGE > /tmp/$result_file_name 2>&1
+    gsutil cp /tmp/$result_file_name gs://$PROJECT-output/private_result/$result_file_name
   else
-    grpc_cloud_prod_test $TEST grpc-docker-testclients1 $LANGUAGE
+    grpc_cloud_prod_auth_test $TEST $CLIENT $LANGUAGE
   fi
 fi