diff --git a/apps/emqx_auto_subscribe/src/emqx_auto_subscribe.erl b/apps/emqx_auto_subscribe/src/emqx_auto_subscribe.erl
index 558e5005c..81b0d70a4 100644
--- a/apps/emqx_auto_subscribe/src/emqx_auto_subscribe.erl
+++ b/apps/emqx_auto_subscribe/src/emqx_auto_subscribe.erl
@@ -80,8 +80,15 @@ format(Rule = #{topic := Topic}) when is_map(Rule) ->
     }.
 
 update_(Topics) when length(Topics) =< ?MAX_AUTO_SUBSCRIBE ->
-    {ok, _} = emqx:update_config([auto_subscribe, topics], Topics),
-    update_hook();
+    case emqx_conf:update([auto_subscribe, topics],
+                          Topics,
+                          #{rawconf_with_defaults => true, override_to => cluster}) of
+        {ok, #{raw_config := NewTopics}} ->
+            ok = update_hook(),
+            {ok, NewTopics};
+        {error, Reason} ->
+            {error, Reason}
+    end;
 update_(_Topics) ->
     {error, quota_exceeded}.
 
diff --git a/apps/emqx_auto_subscribe/src/emqx_auto_subscribe_api.erl b/apps/emqx_auto_subscribe/src/emqx_auto_subscribe_api.erl
index d1207544a..cb5372d5d 100644
--- a/apps/emqx_auto_subscribe/src/emqx_auto_subscribe_api.erl
+++ b/apps/emqx_auto_subscribe/src/emqx_auto_subscribe_api.erl
@@ -22,6 +22,7 @@
 
 -export([auto_subscribe/2]).
 
+-define(INTERNAL_ERROR, 'INTERNAL_ERROR').
 -define(EXCEED_LIMIT, 'EXCEED_LIMIT').
 -define(BAD_REQUEST, 'BAD_REQUEST').
 
@@ -90,6 +91,9 @@ auto_subscribe(put, #{body := Params}) ->
             Message = list_to_binary(io_lib:format("Max auto subscribe topic count is  ~p",
                                         [emqx_auto_subscribe:max_limit()])),
             {409, #{code => ?EXCEED_LIMIT, message => Message}};
-        ok ->
-            {200, emqx_auto_subscribe:list()}
+        {error, Reason} ->
+            Message = list_to_binary(io_lib:format("Update config failed ~p", [Reason])),
+            {500, #{code => ?INTERNAL_ERROR, message => Message}};
+        {ok, NewTopics} ->
+            {200, NewTopics}
     end.
diff --git a/apps/emqx_auto_subscribe/test/emqx_auto_subscribe_SUITE.erl b/apps/emqx_auto_subscribe/test/emqx_auto_subscribe_SUITE.erl
index 0e5022533..92eb9a9ab 100644
--- a/apps/emqx_auto_subscribe/test/emqx_auto_subscribe_SUITE.erl
+++ b/apps/emqx_auto_subscribe/test/emqx_auto_subscribe_SUITE.erl
@@ -85,7 +85,7 @@ init_per_suite(Config) ->
                 }
             ]
         }">>),
-    emqx_common_test_helpers:start_apps([emqx_dashboard, ?APP], fun set_special_configs/1),
+    emqx_common_test_helpers:start_apps([emqx_dashboard, emqx_conf, ?APP], fun set_special_configs/1),
     Config.
 
 set_special_configs(emqx_dashboard) ->
@@ -113,15 +113,17 @@ topic_config(T) ->
 
 end_per_suite(_) ->
     application:unload(emqx_management),
+    application:unload(emqx_conf),
     application:unload(?APP),
     meck:unload(emqx_resource),
     meck:unload(emqx_schema),
-    emqx_common_test_helpers:stop_apps([emqx_dashboard, ?APP]).
+    emqx_common_test_helpers:stop_apps([emqx_dashboard, emqx_conf, ?APP]).
 
 t_auto_subscribe(_) ->
+    emqx_auto_subscribe:update([#{<<"topic">> => Topic} || Topic <- ?TOPICS]),
     {ok, Client} = emqtt:start_link(#{username => ?CLIENT_USERNAME, clientid => ?CLIENT_ID}),
     {ok, _} = emqtt:connect(Client),
-    timer:sleep(100),
+    timer:sleep(200),
     ?assertEqual(check_subs(length(?TOPICS)), ok),
     emqtt:disconnect(Client),
     ok.
@@ -148,6 +150,7 @@ t_update(_) ->
 
 check_subs(Count) ->
     Subs = ets:tab2list(emqx_suboption),
+    ct:pal("--->  ~p ~p ~n", [Subs, Count]),
     ?assert(length(Subs) >= Count),
     check_subs((Subs), ?ENSURE_TOPICS).
 
diff --git a/apps/emqx_modules/src/emqx_delayed.erl b/apps/emqx_modules/src/emqx_delayed.erl
index 69e9ebb5b..fef0a1ae1 100644
--- a/apps/emqx_modules/src/emqx_delayed.erl
+++ b/apps/emqx_modules/src/emqx_delayed.erl
@@ -187,7 +187,7 @@ delete_delayed_message(Id0) ->
             mria:dirty_delete(?TAB, {Timestamp, Id})
     end.
 update_config(Config) ->
-    {ok, _} = emqx:update_config([delayed], Config).
+    emqx_conf:update([delayed], Config, #{rawconf_with_defaults => true, override_to => cluster}).
 
 %%--------------------------------------------------------------------
 %% gen_server callback
diff --git a/apps/emqx_modules/src/emqx_delayed_api.erl b/apps/emqx_modules/src/emqx_delayed_api.erl
index 9199d7b2c..5caad8aa1 100644
--- a/apps/emqx_modules/src/emqx_delayed_api.erl
+++ b/apps/emqx_modules/src/emqx_delayed_api.erl
@@ -25,12 +25,14 @@
 -define(MAX_PAYLOAD_LENGTH, 2048).
 -define(PAYLOAD_TOO_LARGE, 'PAYLOAD_TOO_LARGE').
 
--export([status/2
-    , delayed_messages/2
-    , delayed_message/2
-]).
+-export([ status/2
+        , delayed_messages/2
+        , delayed_message/2
+        ]).
 
--export([paths/0, fields/1, schema/1]).
+-export([ paths/0
+        , fields/1
+        , schema/1]).
 
 %% for rpc
 -export([update_config_/1]).
@@ -40,6 +42,7 @@
 -define(ALREADY_ENABLED, 'ALREADY_ENABLED').
 -define(ALREADY_DISABLED, 'ALREADY_DISABLED').
 
+-define(INTERNAL_ERROR, 'INTERNAL_ERROR').
 -define(BAD_REQUEST, 'BAD_REQUEST').
 
 -define(MESSAGE_ID_NOT_FOUND, 'MESSAGE_ID_NOT_FOUND').
@@ -49,7 +52,11 @@
 api_spec() ->
     emqx_dashboard_swagger:spec(?MODULE).
 
-paths() -> ["/mqtt/delayed", "/mqtt/delayed/messages", "/mqtt/delayed/messages/:msgid"].
+paths() ->
+    [ "/mqtt/delayed"
+    , "/mqtt/delayed/messages"
+    , "/mqtt/delayed/messages/:msgid"
+    ].
 
 schema("/mqtt/delayed") ->
     #{
@@ -189,8 +196,7 @@ get_status() ->
 update_config(Config) ->
     case generate_config(Config) of
         {ok, Config} ->
-            update_config_(Config),
-            {200, get_status()};
+            update_config_(Config);
         {error, {Code, Message}} ->
             {400, #{code => Code, message => Message}}
     end.
@@ -215,29 +221,28 @@ generate_max_delayed_messages(Config) ->
     {ok, Config}.
 
 update_config_(Config) ->
-    lists:foreach(fun(Node) ->
-        update_config_(Node, Config)
-                  end, mria_mnesia:running_nodes()).
-
-update_config_(Node, Config) when Node =:= node() ->
-    _ = emqx_delayed:update_config(Config),
-    case maps:get(<<"enable">>, Config, undefined) of
-        undefined ->
-            ignore;
-        true ->
-            emqx_delayed:enable();
-        false ->
-            emqx_delayed:disable()
-    end,
-    case maps:get(<<"max_delayed_messages">>, Config, undefined) of
-        undefined ->
-            ignore;
-        Max ->
-            ok = emqx_delayed:set_max_delayed_messages(Max)
-    end;
-
-update_config_(Node, Config) ->
-    rpc_call(Node, ?MODULE, ?FUNCTION_NAME, [Node, Config]).
+    case emqx_delayed:update_config(Config) of
+        {ok, #{raw_config := NewDelayed}} ->
+            case maps:get(<<"enable">>, Config, undefined) of
+                undefined ->
+                    ignore;
+                true ->
+                    emqx_delayed:enable();
+                false ->
+                    emqx_delayed:disable()
+            end,
+            case maps:get(<<"max_delayed_messages">>, Config, undefined) of
+                undefined ->
+                    ignore;
+                Max ->
+                    ok = emqx_delayed:set_max_delayed_messages(Max)
+            end,
+            {200, NewDelayed};
+        {error, Reason} ->
+            Message = list_to_binary(
+                          io_lib:format("Update config failed ~p", [Reason])),
+            {500, ?INTERNAL_ERROR, Message}
+    end.
 
 generate_http_code_map(id_schema_error, Id) ->
     #{code => ?MESSAGE_ID_SCHEMA_ERROR, message =>
@@ -245,9 +250,3 @@ generate_http_code_map(id_schema_error, Id) ->
 generate_http_code_map(not_found, Id) ->
     #{code => ?MESSAGE_ID_NOT_FOUND, message =>
           iolist_to_binary(io_lib:format("Message ID ~p not found", [Id]))}.
-
-rpc_call(Node, Module, Fun, Args) ->
-    case rpc:call(Node, Module, Fun, Args) of
-        {badrpc, Reason} -> {error, Reason};
-        Result -> Result
-    end.
diff --git a/apps/emqx_modules/src/emqx_event_message.erl b/apps/emqx_modules/src/emqx_event_message.erl
index ccdb75ccb..3af57a38d 100644
--- a/apps/emqx_modules/src/emqx_event_message.erl
+++ b/apps/emqx_modules/src/emqx_event_message.erl
@@ -44,8 +44,15 @@ list() ->
 
 update(Params) ->
     disable(),
-    {ok, _} = emqx:update_config([event_message], Params),
-    enable().
+    case emqx_conf:update([event_message],
+                        Params,
+                        #{rawconf_with_defaults => true, override_to => cluster}) of
+        {ok, #{raw_config := NewEventMessage}} ->
+            enable(),
+            {ok, NewEventMessage};
+        {error, Reason} ->
+            {error, Reason}
+    end.
 
 enable() ->
     lists:foreach(fun({_Topic, false}) -> ok;
diff --git a/apps/emqx_modules/src/emqx_event_message_api.erl b/apps/emqx_modules/src/emqx_event_message_api.erl
index 80e5825d1..e27311e15 100644
--- a/apps/emqx_modules/src/emqx_event_message_api.erl
+++ b/apps/emqx_modules/src/emqx_event_message_api.erl
@@ -53,5 +53,10 @@ event_message(get, _Params) ->
     {200, emqx_event_message:list()};
 
 event_message(put, #{body := Body}) ->
-    _ = emqx_event_message:update(Body),
-    {200, emqx_event_message:list()}.
+    case emqx_event_message:update(Body) of
+        {ok, NewConfig} ->
+            {200, NewConfig};
+        {error, Reason} ->
+            Message = list_to_binary(io_lib:format("Update config failed ~p", [Reason])),
+            {500, 'INTERNAL_ERROR', Message}
+    end.