diff --git a/lib/tempest b/lib/tempest
index fb14cbf18e..1493b1cce0 100644
--- a/lib/tempest
+++ b/lib/tempest
@@ -61,7 +61,7 @@ BUILD_TIMEOUT=${BUILD_TIMEOUT:-196}
 # This must be False on stable branches, as master tempest
 # deps do not match stable branch deps. Set this to True to
 # have tempest installed in DevStack by default.
-INSTALL_TEMPEST=${INSTALL_TEMPEST:-"True"}
+INSTALL_TEMPEST=${INSTALL_TEMPEST:-"False"}
 
 # This variable is passed directly to pip install inside the common tox venv
 # that is created
@@ -584,7 +584,19 @@ function configure_tempest {
         DISABLE_NETWORK_API_EXTENSIONS+=", metering"
     fi
 
-    local network_api_extensions=${NETWORK_API_EXTENSIONS:-"all"}
+    DEFAULT_NET_EXT="address-scope,agent,allowed-address-pairs,auto-allocated-topology"
+    DEFAULT_NET_EXT+=",availability_zone,binding,default-subnetpools"
+    DEFAULT_NET_EXT+=",dhcp_agent_scheduler,dvr,ext-gw-mode,external-net"
+    DEFAULT_NET_EXT+=",extra_dhcp_opt,extraroute,flavors,l3-flavors,l3-ha"
+    DEFAULT_NET_EXT+=",l3_agent_scheduler,multi-provider,net-mtu"
+    DEFAULT_NET_EXT+=",network-ip-availability,network_availability_zone,pagination"
+    DEFAULT_NET_EXT+=",port-security,project-id,provider,quotas,rbac-policies,router"
+    DEFAULT_NET_EXT+=",router_availability_zone,security-group,service-type,sorting"
+    DEFAULT_NET_EXT+=",standard-attr-description,standard-attr-revisions"
+    DEFAULT_NET_EXT+=",standard-attr-timestamp,subnet-service-types,subnet_allocation"
+    DEFAULT_NET_EXT+=",tag"
+
+    local network_api_extensions=${NETWORK_API_EXTENSIONS:-$DEFAULT_NET_EXT}
     if [[ ! -z "$DISABLE_NETWORK_API_EXTENSIONS" ]]; then
         # Enabled extensions are either the ones explicitly specified or those available on the API endpoint
         network_api_extensions=${NETWORK_API_EXTENSIONS:-$(iniget $tmp_cfg_file network-feature-enabled api_extensions | tr -d " ")}
@@ -592,8 +604,12 @@ function configure_tempest {
         network_api_extensions=$(remove_disabled_extensions $network_api_extensions $DISABLE_NETWORK_API_EXTENSIONS)
     fi
     iniset $TEMPEST_CONFIG network-feature-enabled api_extensions $network_api_extensions
+
     # Swift API Extensions
-    local object_storage_api_extensions=${OBJECT_STORAGE_API_EXTENSIONS:-"all"}
+    DEFAULT_SWIFT_OPT="account_quotas,bulk_delete,bulk_upload,container_quotas"
+    DEFAULT_SWIFT_OPT+=",container_sync,crossdomain,formpost,ratelimit,slo"
+    DEFAULT_SWIFT_OPT+=",staticweb,tempauth,tempurl"
+    local object_storage_api_extensions=${OBJECT_STORAGE_API_EXTENSIONS:-$DEFAULT_SWIFT_OPT}
     if [[ ! -z "$DISABLE_OBJECT_STORAGE_API_EXTENSIONS" ]]; then
         # Enabled extensions are either the ones explicitly specified or those available on the API endpoint
         object_storage_api_extensions=${OBJECT_STORAGE_API_EXTENSIONS:-$(iniget $tmp_cfg_file object-storage-feature-enabled discoverable_apis | tr -d " ")}
@@ -602,7 +618,16 @@ function configure_tempest {
     fi
     iniset $TEMPEST_CONFIG object-storage-feature-enabled discoverable_apis $object_storage_api_extensions
     # Cinder API Extensions
-    local volume_api_extensions=${VOLUME_API_EXTENSIONS:-"all"}
+    DEFAULT_VOL_EXT="OS-SCH-HNT,backups,capabilities,cgsnapshots,consistencygroups,encryption"
+    DEFAULT_VOL_EXT+=",os-admin-actions,os-availability-zone,os-extended-services"
+    DEFAULT_VOL_EXT+=",os-extended-snapshot-attributes,os-hosts,os-image-create,os-quota-class-sets"
+    DEFAULT_VOL_EXT+=",os-quota-sets,os-services,os-snapshot-actions,os-snapshot-manage,"
+    DEFAULT_VOL_EXT+="os-snapshot-unmanage,os-types-extra-specs,os-types-manage,os-used-limits"
+    DEFAULT_VOL_EXT+=",os-vol-host-attr,os-vol-image-meta,os-vol-mig-status-attr,os-vol-tenant-attr"
+    DEFAULT_VOL_EXT+=",os-volume-actions,os-volume-encryption-metadata,os-volume-manage,os-volume-transfer"
+    DEFAULT_VOL_EXT+=",os-volume-type-access,os-volume-unmanage,qos-specs,scheduler-stats"
+    local volume_api_extensions=${VOLUME_API_EXTENSIONS:-$DEFAULT_VOL_EXT}
+
     if [[ ! -z "$DISABLE_VOLUME_API_EXTENSIONS" ]]; then
         # Enabled extensions are either the ones explicitly specified or those available on the API endpoint
         volume_api_extensions=${VOLUME_API_EXTENSIONS:-$(iniget $tmp_cfg_file volume-feature-enabled api_extensions | tr -d " ")}