diff --git a/etc/emq.conf b/etc/emq.conf
index 0dac74c77..82209dde7 100644
--- a/etc/emq.conf
+++ b/etc/emq.conf
@@ -1,4 +1,3 @@
-
 ##===================================================================
 ## EMQ Configuration R2.3
 ##===================================================================
@@ -11,7 +10,7 @@
 cluster.name = emqcl
 
 ## Cluster discovery strategy: manual | static | mcast | dns | etcd | k8s
-cluster.discovery = mcast
+cluster.discovery = manual
 
 ## Cluster Autoheal: on | off
 cluster.autoheal = on
@@ -22,49 +21,49 @@ cluster.autoclean = 5m
 ##--------------------------------------------------------------------
 ## Cluster with static node list
 
-## cluster.static.seeds = ekka1@127.0.0.1,ekka2@127.0.0.1
+## cluster.static.seeds = emq1@127.0.0.1,emq2@127.0.0.1
 
 ##--------------------------------------------------------------------
 ## Cluster with multicast
 
-cluster.mcast.addr = 239.192.0.1
+## cluster.mcast.addr = 239.192.0.1
 
-cluster.mcast.ports = 4369,4370
+## cluster.mcast.ports = 4369,4370
 
-cluster.mcast.iface = 0.0.0.0
+## cluster.mcast.iface = 0.0.0.0
 
-cluster.mcast.ttl = 255
+## cluster.mcast.ttl = 255
 
-cluster.mcast.loop = on
+## cluster.mcast.loop = on
 
 ##--------------------------------------------------------------------
 ## Cluster with DNS
 
-cluster.dns.name = localhost
+## cluster.dns.name = localhost
 
-cluster.dns.app  = emqx
+## cluster.dns.app = emq
 
 ##--------------------------------------------------------------------
 ## Cluster with Etcd
 
-cluster.etcd.server = http://127.0.0.1:2379
+## cluster.etcd.server = http://127.0.0.1:2379
 
-cluster.etcd.prefix = emqcluster
+## cluster.etcd.prefix = emqcl
 
-cluster.etcd.node_ttl = 1m
+## cluster.etcd.node_ttl = 1m
 
 ##--------------------------------------------------------------------
 ## Cluster with k8s
 
-cluster.k8s.apiserver = http://10.110.111.204:8080
+## cluster.k8s.apiserver = http://10.110.111.204:8080
 
-cluster.k8s.service_name = emq
+## cluster.k8s.service_name = emq
 
 ## Address Type: ip | dns
-cluster.k8s.address_type = ip
+## cluster.k8s.address_type = ip
 
 ## The Erlang application name 
-cluster.k8s.app_name = emq
+## cluster.k8s.app_name = emq
 
 ##--------------------------------------------------------------------
 ## Node Args
diff --git a/priv/emq.schema b/priv/emq.schema
index 293ec67a4..f4c369b9c 100644
--- a/priv/emq.schema
+++ b/priv/emq.schema
@@ -7,7 +7,7 @@
 
 %% @doc Cluster name
 {mapping, "cluster.name", "ekka.cluster_name", [
-  {default, ekka},
+  {default, emqcl},
   {datatype, atom}
 ]}.
 
@@ -29,14 +29,14 @@
 ]}.
 
 %%--------------------------------------------------------------------
-%% Cluster with static node list
+%% Cluster by static node list
 
 {mapping, "cluster.static.seeds", "ekka.cluster_discovery", [
   {datatype, string}
 ]}.
 
 %%--------------------------------------------------------------------
-%% Cluster with IP Multicast
+%% Cluster by UDP Multicast
 
 {mapping, "cluster.mcast.addr", "ekka.cluster_discovery", [
   {default, "239.192.0.1"},
@@ -55,7 +55,7 @@
 
 {mapping, "cluster.mcast.ttl", "ekka.cluster_discovery", [
   {datatype, integer},
-  {default, 1}
+  {default, 255}
 ]}.
 
 {mapping, "cluster.mcast.loop", "ekka.cluster_discovery", [
@@ -79,7 +79,8 @@
 ]}.
 
 %%--------------------------------------------------------------------
-%% Cluster with DNS
+%% Cluster by DNS A Record
+
 {mapping, "cluster.dns.name", "ekka.cluster_discovery", [
   {datatype, string}
 ]}.
@@ -89,7 +90,7 @@
 ]}.
 
 %%--------------------------------------------------------------------
-%% Cluster with etcd
+%% Cluster using etcd
 
 {mapping, "cluster.etcd.server", "ekka.cluster_discovery", [
   {datatype, string}
@@ -105,7 +106,7 @@
 ]}.
 
 %%--------------------------------------------------------------------
-%% Cluster with K8s
+%% Cluster on K8s
 
 {mapping, "cluster.k8s.apiserver", "ekka.cluster_discovery", [
   {datatype, string}
@@ -145,7 +146,7 @@
                   {app, cuttlefish:conf_get("cluster.dns.app", Conf)}];
                (etcd) ->
                  [{server, string:tokens(cuttlefish:conf_get("cluster.etcd.server", Conf), ",")},
-                  {prefix, cuttlefish:conf_get("cluster.etcd.prefix", Conf, "emq")},
+                  {prefix, cuttlefish:conf_get("cluster.etcd.prefix", Conf, "emqcl")},
                   {node_ttl, cuttlefish:conf_get("cluster.etcd.node_ttl", Conf, 60)}];
                (k8s) ->
                  [{apiserver, cuttlefish:conf_get("cluster.k8s.apiserver", Conf)},