diff --git a/metadata/service/compute/ironic.yml b/metadata/service/compute/ironic.yml
index c776dde..3cc8755 100644
--- a/metadata/service/compute/ironic.yml
+++ b/metadata/service/compute/ironic.yml
@@ -11,6 +11,7 @@
       ram_allocation_ratio: 1.0
       force_config_drive: True
       config_drive_format: 'iso9660'
+      reserved_host_memory_mb: 0
       database:
         engine: mysql
         host: ${_param:cluster_vip_address}