diff --git a/puppet/services/database/mongodb.yaml b/puppet/services/database/mongodb.yaml
index 63ec44460d..5059721640 100644
--- a/puppet/services/database/mongodb.yaml
+++ b/puppet/services/database/mongodb.yaml
@@ -19,6 +19,10 @@ parameters:
     description: Mapping of service endpoint -> protocol. Typically set
                  via parameter_defaults in the resource registry.
     type: json
+  MongodbMemoryLimit:
+    default: '20G'
+    description: Limit the amount of memory mongodb uses with systemd.
+    type: string
   MongoDbLoggingSource:
     type: json
     description: Fluentd logging configuration for mongodb.
@@ -49,6 +53,7 @@ outputs:
         map_merge:
           - get_attr: [MongoDbBase, role_data, config_settings]
           - tripleo::profile::base::database::mongodb::mongodb_replset: {get_attr: [MongoDbBase, aux_parameters, rplset_name]}
+            tripleo::profile::base::database::mongodb::memory_limit: {get_param: MongodbMemoryLimit}
             mongodb::server::service_manage: True
             tripleo.mongodb.firewall_rules:
               '101 mongodb_config':
diff --git a/releasenotes/notes/restrict-mongodb-memory-de7bf6754d7234d9.yaml b/releasenotes/notes/restrict-mongodb-memory-de7bf6754d7234d9.yaml
new file mode 100644
index 0000000000..86622bc1c1
--- /dev/null
+++ b/releasenotes/notes/restrict-mongodb-memory-de7bf6754d7234d9.yaml
@@ -0,0 +1,3 @@
+---
+fixes:
+  - Add knobs to limit memory comsumed by mongodb with systemd