supply private_key_fn for ceilometer sync
diff --git a/xos/configurations/cord-pod/ceilometer.yaml b/xos/configurations/cord-pod/ceilometer.yaml
index d07f2e9..07b163e 100644
--- a/xos/configurations/cord-pod/ceilometer.yaml
+++ b/xos/configurations/cord-pod/ceilometer.yaml
@@ -124,6 +124,7 @@
           kind: ceilometer
           ceilometer_pub_sub_url: http://10.11.10.1:4455/
           public_key: { get_artifact: [ SELF, pubkey, LOCAL_FILE] }
+          private_key_fn: /opt/xos/synchronizers/monitoring_channel/monitoring_channel_private_key
       artifacts:
           pubkey: /opt/xos/synchronizers/monitoring_channel/monitoring_channel_public_key