diff --git a/stack.sh b/stack.sh
index e9831d5039..abd6a4d11e 100755
--- a/stack.sh
+++ b/stack.sh
@@ -42,6 +42,8 @@ if [[ -n "$NOUNSET" ]]; then
     set -o nounset
 fi
 
+# Set start of devstack timestamp
+DEVSTACK_START_TIME=$(date +%s)
 
 # Configuration
 # =============
@@ -481,11 +483,14 @@ function exit_trap {
 
     if [[ $r -ne 0 ]]; then
         echo "Error on exit"
+        generate-subunit $DEVSTACK_START_TIME $SECONDS 'fail' >> ${SUBUNIT_OUTPUT}
         if [[ -z $LOGDIR ]]; then
             $TOP_DIR/tools/worlddump.py
         else
             $TOP_DIR/tools/worlddump.py -d $LOGDIR
         fi
+    else
+        generate-subunit $DEVSTACK_START_TIME $SECONDS >> ${SUBUNIT_OUTPUT}
     fi
 
     exit $r
@@ -710,6 +715,9 @@ if [[ "$OFFLINE" != "True" ]]; then
     PYPI_ALTERNATIVE_URL=${PYPI_ALTERNATIVE_URL:-""} $TOP_DIR/tools/install_pip.sh
 fi
 
+# Install subunit for the subunit output stream
+pip_install -U os-testr
+
 TRACK_DEPENDS=${TRACK_DEPENDS:-False}
 
 # Install Python packages into a virtualenv so that we can track them
diff --git a/stackrc b/stackrc
index 1786a44ff3..58146a4a1c 100644
--- a/stackrc
+++ b/stackrc
@@ -29,6 +29,9 @@ DATA_DIR=${DEST}/data
 # Destination for status files
 SERVICE_DIR=${DEST}/status
 
+# Path for subunit output file
+SUBUNIT_OUTPUT=${DEST}/devstack.subunit
+
 # Determine stack user
 if [[ $EUID -eq 0 ]]; then
     STACK_USER=stack