diff --git a/dokku b/dokku
index f59d247f0..d4e00a68c 100755
--- a/dokku
+++ b/dokku
@@ -88,14 +88,12 @@ case "$1" in
       port=5000
       id=$(docker run -d -e PORT=$port $DOCKER_ARGS $IMAGE /bin/bash -c "/start web")
       ipaddr=$(docker inspect --format '{{ .NetworkSettings.IPAddress }}' $id)
-
-      echo $ipaddr > "$DOKKU_ROOT/$APP/IP"
     else
       id=$(docker run -d -p 5000 -e PORT=5000 $DOCKER_ARGS $IMAGE /bin/bash -c "/start web")
       port=$(docker port $id 5000 | sed 's/[0-9.]*://')
-
-      [[ -f "$DOKKU_ROOT/$APP/IP" ]] && rm -f "$DOKKU_ROOT/$APP/IP"
+      ipaddr=127.0.0.1
     fi
+    echo $ipaddr > "$DOKKU_ROOT/$APP/IP"
 
     # if we can't post-deploy successfully, kill new container
     function kill_new {
diff --git a/plugins/nginx-vhosts/commands b/plugins/nginx-vhosts/commands
index 8434f21ae..b9ef3cf02 100755
--- a/plugins/nginx-vhosts/commands
+++ b/plugins/nginx-vhosts/commands
@@ -15,12 +15,18 @@ restart_nginx () {
 
 case "$1" in
   nginx:build-config)
-    APP="$2"; PORT="$3"; IP="${4:-127.0.0.1}"
-    [[ -z "$PORT" ]] && PORT=$(< "$DOKKU_ROOT/$APP/PORT")
+    APP="$2"; PORT="$3"; IP="${4}"
     VHOST_PATH="$DOKKU_ROOT/$APP/VHOST"
     WILDCARD_SSL="$DOKKU_ROOT/tls"
     SSL="$DOKKU_ROOT/$APP/tls"
 
+    if [[ -z "$PORT" ]] && [[ -f "$DOKKU_ROOT/$APP/PORT" ]]; then
+      PORT=$(< "$DOKKU_ROOT/$APP/PORT")
+    fi
+    if [[ -z "$IP" ]] && [[ -f "$DOKKU_ROOT/$APP/IP" ]]; then
+      IP=$(< "$DOKKU_ROOT/$APP/IP")
+    fi
+
     [[ -f "$DOKKU_ROOT/$APP/ENV" ]] && source $DOKKU_ROOT/$APP/ENV
 
     if [[ ! -n "$NO_VHOST" ]]; then
@@ -67,15 +73,17 @@ EOF
       # Include SSL_VHOSTS so we can redirect http to https on that hostname as well
       NOSSL_SERVER_NAME=$(echo $NONSSL_VHOSTS $SSL_VHOSTS| tr '\n' ' ')
 
-      echo "-----> Creating $SCHEME nginx.conf"
-      echo "upstream $APP { server $IP:$PORT; }" > $DOKKU_ROOT/$APP/nginx.conf
-      eval "cat <<< \"$(< $NGINX_CONF)\" >> $DOKKU_ROOT/$APP/nginx.conf"
+      if [[ -n "$PORT" ]] && [[ -n "$IP" ]]; then
+        echo "-----> Creating $SCHEME nginx.conf"
+        echo "upstream $APP { server $IP:$PORT; }" > $DOKKU_ROOT/$APP/nginx.conf
+        eval "cat <<< \"$(< $NGINX_CONF)\" >> $DOKKU_ROOT/$APP/nginx.conf"
 
-      echo "-----> Running nginx-pre-reload"
-      pluginhook nginx-pre-reload $APP $PORT
+        echo "-----> Running nginx-pre-reload"
+        pluginhook nginx-pre-reload $APP $PORT $IP
 
-      echo "       Reloading nginx"
-      restart_nginx
+        echo "       Reloading nginx"
+        restart_nginx
+      fi
     else
       if [[ -f "$DOKKU_ROOT/$APP/VHOST" ]]; then
         echo "-----> NO_VHOST set, deleting $APP/VHOST"
diff --git a/tests.mk b/tests.mk
index ac45a75fe..ef84dbf5a 100644
--- a/tests.mk
+++ b/tests.mk
@@ -17,7 +17,7 @@ ifdef ENABLE_DOKKU_TRACE
 	echo "export DOKKU_TRACE=1" >> /home/dokku/dokkurc
 endif
 	@echo "Setting dokku.me in /etc/hosts"
-	sudo /bin/bash -c "[[ `ping -c1 dokku.me > /dev/null 2>&1; echo $$?` -eq 0 ]] || echo \"127.0.0.1  dokku.me *.dokku.me\" >> /etc/hosts"
+	sudo /bin/bash -c "[[ `ping -c1 dokku.me > /dev/null 2>&1; echo $$?` -eq 0 ]] || echo \"127.0.0.1  dokku.me *.dokku.me www.test.app.dokku.me\" >> /etc/hosts"
 
 	@echo "-----> Generating keypair..."
 	mkdir -p /root/.ssh
diff --git a/tests/unit/domains.bats b/tests/unit/domains.bats
index 67b8cbb72..55e33eb57 100644
--- a/tests/unit/domains.bats
+++ b/tests/unit/domains.bats
@@ -3,7 +3,7 @@
 load test_helper
 
 setup() {
-  deploy_app
+  create_app
 }
 
 teardown() {
diff --git a/tests/unit/ports.bats b/tests/unit/ports.bats
index ebafd23a5..9e641eed3 100644
--- a/tests/unit/ports.bats
+++ b/tests/unit/ports.bats
@@ -66,3 +66,17 @@ teardown() {
   echo "status: "$status
   assert_success
 }
+
+@test "port exposure (domains:add)" {
+  create_app
+  run dokku domains:add $TEST_APP www.test.app.dokku.me
+  echo "output: "$output
+  echo "status: "$status
+  assert_success
+  deploy_app
+  sleep 5 # wait for nginx to reload
+  run bash -c "response=\"$(curl -s -S www.test.app.dokku.me)\"; echo \$response; test \"\$response\" == \"nodejs/express\""
+  echo "output: "$output
+  echo "status: "$status
+  assert_success
+}
diff --git a/tests/unit/test_helper.bash b/tests/unit/test_helper.bash
index d2b10dd47..763574a8c 100644
--- a/tests/unit/test_helper.bash
+++ b/tests/unit/test_helper.bash
@@ -90,7 +90,7 @@ destroy_app() {
 
 deploy_app() {
   TMP=$(mktemp -d -t "$TARGET.XXXXX")
-  rmdir $TMP && cp -r ./tests/apps/config $TMP
+  rmdir $TMP && cp -r ./tests/apps/nodejs-express $TMP
   cd $TMP
   git init
   git config user.email "robot@example.com"