diff --git a/metadata/service/agent/single/common.yml b/metadata/service/agent/single/common.yml
index 34739ad..cddc192 100644
--- a/metadata/service/agent/single/common.yml
+++ b/metadata/service/agent/single/common.yml
@@ -13,6 +13,8 @@
       enabled: true
       version: ${_param:ceilometer_version}
       secret: ${_param:ceilometer_secret_key}
+      concurrency:
+        lock_path: '/var/lib/ceilometer/tmp'
       identity:
         engine: keystone
         host: ${_param:cluster_vip_address}