Add 'cluster.cookie' configuration

etc/emq.conf

@@ -10,6 +10,9 @@
 ## The cluster Id
 cluster.id = emq
 
+## Cookie for distributed node
+cluster.cookie = emqsecretcookie
+
 ## The multicast address and port.
 cluster.multicast = 239.192.0.1:44369
 
@@ -85,6 +88,9 @@ log.syslog.level = error
 ## Console log file
 ## log.console.file = {{ platform_log_dir }}/console.log
 
+## Info log file
+## log.info.file = {{ platform_log_dir }}/info.log
+
 ## Error log file
 log.error.file = {{ platform_log_dir }}/error.log
 

priv/emq.schema

@@ -11,6 +11,11 @@
   {datatype, string}
 ]}.
 
+%% @doc Secret cookie for distributed erlang node
+{mapping, "cluster.cookie", "vm_args.-setcookie", [
+  {default, "emqsecretcookie"}
+]}.
+
 %% Cluster Multicast Addr
 {mapping, "cluster.multicast", "emqttd.cluster", [
   {default, "239.192.0.1:44369"},