diff --git a/apps/emqx/src/emqx.erl b/apps/emqx/src/emqx.erl
index 5df45bd15..1d4686561 100644
--- a/apps/emqx/src/emqx.erl
+++ b/apps/emqx/src/emqx.erl
@@ -55,7 +55,12 @@
 -export([ set_debug_secret/1
         ]).
 
--export([ update_config/2
+%% Configs APIs
+-export([ get_config/1
+        , get_config/2
+        , get_raw_config/1
+        , get_raw_config/2
+        , update_config/2
         , update_config/3
         , remove_config/1
         , remove_config/2
@@ -192,6 +197,22 @@ run_hook(HookPoint, Args) ->
 run_fold_hook(HookPoint, Args, Acc) ->
     emqx_hooks:run_fold(HookPoint, Args, Acc).
 
+-spec get_config(emqx_map_lib:config_key_path()) -> term().
+get_config(KeyPath) ->
+    emqx_config:get(KeyPath).
+
+-spec get_config(emqx_map_lib:config_key_path(), term()) -> term().
+get_config(KeyPath, Default) ->
+    emqx_config:get(KeyPath, Default).
+
+-spec get_raw_config(emqx_map_lib:config_key_path()) -> term().
+get_raw_config(KeyPath) ->
+    emqx_config:get_raw(KeyPath).
+
+-spec get_raw_config(emqx_map_lib:config_key_path(), term()) -> term().
+get_raw_config(KeyPath, Default) ->
+    emqx_config:get_raw(KeyPath, Default).
+
 -spec update_config(emqx_map_lib:config_key_path(), emqx_config:update_request()) ->
     {ok, emqx_config:update_result()} | {error, emqx_config:update_error()}.
 update_config(KeyPath, UpdateReq) ->
diff --git a/apps/emqx/src/emqx_alarm.erl b/apps/emqx/src/emqx_alarm.erl
index 44b005faa..e52328d66 100644
--- a/apps/emqx/src/emqx_alarm.erl
+++ b/apps/emqx/src/emqx_alarm.erl
@@ -199,7 +199,7 @@ handle_call({activate_alarm, Name, Details}, _From, State) ->
                                      message = normalize_message(Name, Details),
                                      activate_at = erlang:system_time(microsecond)},
             ekka_mnesia:dirty_write(?ACTIVATED_ALARM, Alarm),
-            do_actions(activate, Alarm, emqx_config:get([alarm, actions])),
+            do_actions(activate, Alarm, emqx:get_config([alarm, actions])),
             {reply, ok, State}
     end;
 
@@ -268,11 +268,11 @@ code_change(_OldVsn, State, _Extra) ->
 %%------------------------------------------------------------------------------
 
 get_validity_period() ->
-    emqx_config:get([alarm, validity_period]).
+    emqx:get_config([alarm, validity_period]).
 
 deactivate_alarm(Details, #activated_alarm{activate_at = ActivateAt, name = Name,
         details = Details0, message = Msg0}) ->
-    SizeLimit = emqx_config:get([alarm, size_limit]),
+    SizeLimit = emqx:get_config([alarm, size_limit]),
     case SizeLimit > 0 andalso (mnesia:table_info(?DEACTIVATED_ALARM, size) >= SizeLimit) of
         true ->
             case mnesia:dirty_first(?DEACTIVATED_ALARM) of
@@ -289,7 +289,7 @@ deactivate_alarm(Details, #activated_alarm{activate_at = ActivateAt, name = Name
                     erlang:system_time(microsecond)),
     ekka_mnesia:dirty_write(?DEACTIVATED_ALARM, HistoryAlarm),
     ekka_mnesia:dirty_delete(?ACTIVATED_ALARM, Name),
-    do_actions(deactivate, DeActAlarm, emqx_config:get([alarm, actions])).
+    do_actions(deactivate, DeActAlarm, emqx:get_config([alarm, actions])).
 
 make_deactivated_alarm(ActivateAt, Name, Details, Message, DeActivateAt) ->
     #deactivated_alarm{
diff --git a/apps/emqx/src/emqx_broker.erl b/apps/emqx/src/emqx_broker.erl
index 1248f9980..46accb9fe 100644
--- a/apps/emqx/src/emqx_broker.erl
+++ b/apps/emqx/src/emqx_broker.erl
@@ -242,7 +242,7 @@ route(Routes, Delivery) ->
 do_route({To, Node}, Delivery) when Node =:= node() ->
     {Node, To, dispatch(To, Delivery)};
 do_route({To, Node}, Delivery) when is_atom(Node) ->
-    {Node, To, forward(Node, To, Delivery, emqx_config:get([rpc, mode]))};
+    {Node, To, forward(Node, To, Delivery, emqx:get_config([rpc, mode]))};
 do_route({To, Group}, Delivery) when is_tuple(Group); is_binary(Group) ->
     {share, To, emqx_shared_sub:dispatch(Group, To, Delivery)}.
 
diff --git a/apps/emqx/src/emqx_cm_locker.erl b/apps/emqx/src/emqx_cm_locker.erl
index c1a85d6c9..5a336d61c 100644
--- a/apps/emqx/src/emqx_cm_locker.erl
+++ b/apps/emqx/src/emqx_cm_locker.erl
@@ -62,5 +62,5 @@ unlock(ClientId) ->
 
 -spec(strategy() -> local | leader | quorum | all).
 strategy() ->
-    emqx_config:get([broker, session_locking_strategy]).
+    emqx:get_config([broker, session_locking_strategy]).
 
diff --git a/apps/emqx/src/emqx_cm_registry.erl b/apps/emqx/src/emqx_cm_registry.erl
index c04f6ccaf..9326d2b8e 100644
--- a/apps/emqx/src/emqx_cm_registry.erl
+++ b/apps/emqx/src/emqx_cm_registry.erl
@@ -65,7 +65,7 @@ start_link() ->
 %% @doc Is the global registry enabled?
 -spec(is_enabled() -> boolean()).
 is_enabled() ->
-    emqx_config:get([broker, enable_session_registry]).
+    emqx:get_config([broker, enable_session_registry]).
 
 %% @doc Register a global channel.
 -spec(register_channel(emqx_types:clientid()
diff --git a/apps/emqx/src/emqx_config.erl b/apps/emqx/src/emqx_config.erl
index d5bf1a61e..056929123 100644
--- a/apps/emqx/src/emqx_config.erl
+++ b/apps/emqx/src/emqx_config.erl
@@ -43,6 +43,12 @@
         , put/2
         ]).
 
+-export([ get_raw/1
+        , get_raw/2
+        , put_raw/1
+        , put_raw/2
+        ]).
+
 -export([ save_schema_mod_and_names/1
         , get_schema_mod/0
         , get_schema_mod/1
@@ -61,12 +67,6 @@
         , find_listener_conf/3
         ]).
 
--export([ get_raw/1
-        , get_raw/2
-        , put_raw/1
-        , put_raw/2
-        ]).
-
 -define(CONF, conf).
 -define(RAW_CONF, raw_conf).
 -define(PERSIS_SCHEMA_MODS, {?MODULE, schema_mods}).
diff --git a/apps/emqx/src/emqx_connection.erl b/apps/emqx/src/emqx_connection.erl
index ac66c4daf..dcb50fa4e 100644
--- a/apps/emqx/src/emqx_connection.erl
+++ b/apps/emqx/src/emqx_connection.erl
@@ -905,7 +905,7 @@ get_state(Pid) ->
                              tl(tuple_to_list(State)))).
 
 get_active_n(Zone, Listener) ->
-    case emqx_config:get([zones, Zone, listeners, Listener, type]) of
+    case emqx:get_config([zones, Zone, listeners, Listener, type]) of
         quic -> 100;
         _ -> emqx_config:get_listener_conf(Zone, Listener, [tcp, active_n])
     end.
diff --git a/apps/emqx/src/emqx_flapping.erl b/apps/emqx/src/emqx_flapping.erl
index c4a523669..1908430be 100644
--- a/apps/emqx/src/emqx_flapping.erl
+++ b/apps/emqx/src/emqx_flapping.erl
@@ -160,4 +160,4 @@ start_timer(Zone) ->
 start_timers() ->
     lists:foreach(fun({Zone, _ZoneConf}) ->
             start_timer(Zone)
-        end, maps:to_list(emqx_config:get([zones], #{}))).
+        end, maps:to_list(emqx:get_config([zones], #{}))).
diff --git a/apps/emqx/src/emqx_global_gc.erl b/apps/emqx/src/emqx_global_gc.erl
index 9449efe9a..5192508e5 100644
--- a/apps/emqx/src/emqx_global_gc.erl
+++ b/apps/emqx/src/emqx_global_gc.erl
@@ -85,7 +85,7 @@ code_change(_OldVsn, State, _Extra) ->
 %%--------------------------------------------------------------------
 
 ensure_timer(State) ->
-    case emqx_config:get([node, global_gc_interval]) of
+    case emqx:get_config([node, global_gc_interval]) of
         undefined -> State;
         Interval  -> TRef = emqx_misc:start_timer(Interval, run),
                      State#{timer := TRef}
diff --git a/apps/emqx/src/emqx_listeners.erl b/apps/emqx/src/emqx_listeners.erl
index f80800768..f39c11305 100644
--- a/apps/emqx/src/emqx_listeners.erl
+++ b/apps/emqx/src/emqx_listeners.erl
@@ -43,7 +43,7 @@ list() ->
     [{listener_id(ZoneName, LName), LConf} || {ZoneName, LName, LConf} <- do_list()].
 
 do_list() ->
-    Zones = maps:to_list(emqx_config:get([zones], #{})),
+    Zones = maps:to_list(emqx:get_config([zones], #{})),
     lists:append([list(ZoneName, ZoneConf) || {ZoneName, ZoneConf} <- Zones]).
 
 list(ZoneName, ZoneConf) ->
diff --git a/apps/emqx/src/emqx_os_mon.erl b/apps/emqx/src/emqx_os_mon.erl
index 9fd52c21b..85e448f41 100644
--- a/apps/emqx/src/emqx_os_mon.erl
+++ b/apps/emqx/src/emqx_os_mon.erl
@@ -76,7 +76,7 @@ set_procmem_high_watermark(Float) ->
 %%--------------------------------------------------------------------
 
 init([]) ->
-    Opts = emqx_config:get([sysmon, os]),
+    Opts = emqx:get_config([sysmon, os]),
     set_mem_check_interval(maps:get(mem_check_interval, Opts)),
     set_sysmem_high_watermark(maps:get(sysmem_high_watermark, Opts)),
     set_procmem_high_watermark(maps:get(procmem_high_watermark, Opts)),
@@ -91,8 +91,8 @@ handle_cast(Msg, State) ->
     {noreply, State}.
 
 handle_info({timeout, _Timer, check}, State) ->
-    CPUHighWatermark = emqx_config:get([sysmon, os, cpu_high_watermark]) * 100,
-    CPULowWatermark = emqx_config:get([sysmon, os, cpu_low_watermark]) * 100,
+    CPUHighWatermark = emqx:get_config([sysmon, os, cpu_high_watermark]) * 100,
+    CPULowWatermark = emqx:get_config([sysmon, os, cpu_low_watermark]) * 100,
     _ = case emqx_vm:cpu_util() of %% TODO: should be improved?
         0 -> ok;
         Busy when Busy >= CPUHighWatermark ->
@@ -123,7 +123,7 @@ code_change(_OldVsn, State, _Extra) ->
 %%--------------------------------------------------------------------
 
 start_check_timer() ->
-    Interval = emqx_config:get([sysmon, os, cpu_check_interval]),
+    Interval = emqx:get_config([sysmon, os, cpu_check_interval]),
     case erlang:system_info(system_architecture) of
         "x86_64-pc-linux-musl" -> ok;
         _ -> emqx_misc:start_timer(Interval, check)
diff --git a/apps/emqx/src/emqx_plugins.erl b/apps/emqx/src/emqx_plugins.erl
index 6c99305d4..7bb9c084b 100644
--- a/apps/emqx/src/emqx_plugins.erl
+++ b/apps/emqx/src/emqx_plugins.erl
@@ -43,7 +43,7 @@
 %% @doc Load all plugins when the broker started.
 -spec(load() -> ok | ignore | {error, term()}).
 load() ->
-    ok = load_ext_plugins(emqx_config:get([plugins, expand_plugins_dir], undefined)).
+    ok = load_ext_plugins(emqx:get_config([plugins, expand_plugins_dir], undefined)).
 
 %% @doc Load a Plugin
 -spec(load(atom()) -> ok | {error, term()}).
diff --git a/apps/emqx/src/emqx_router.erl b/apps/emqx/src/emqx_router.erl
index 1a5e344f2..8989c3b10 100644
--- a/apps/emqx/src/emqx_router.erl
+++ b/apps/emqx/src/emqx_router.erl
@@ -250,7 +250,7 @@ delete_trie_route(Route = #route{topic = Topic}) ->
 %% @private
 -spec(maybe_trans(function(), list(any())) -> ok | {error, term()}).
 maybe_trans(Fun, Args) ->
-    case emqx_config:get([broker, perf, route_lock_type]) of
+    case emqx:get_config([broker, perf, route_lock_type]) of
         key ->
             trans(Fun, Args);
         global ->
diff --git a/apps/emqx/src/emqx_rpc.erl b/apps/emqx/src/emqx_rpc.erl
index e950e9e3d..527123745 100644
--- a/apps/emqx/src/emqx_rpc.erl
+++ b/apps/emqx/src/emqx_rpc.erl
@@ -72,4 +72,4 @@ filter_result(Delivery) ->
     Delivery.
 
 max_client_num() ->
-    emqx_config:get([rpc, tcp_client_num], ?DefaultClientNum).
+    emqx:get_config([rpc, tcp_client_num], ?DefaultClientNum).
diff --git a/apps/emqx/src/emqx_shared_sub.erl b/apps/emqx/src/emqx_shared_sub.erl
index 1968c47d8..ccc050165 100644
--- a/apps/emqx/src/emqx_shared_sub.erl
+++ b/apps/emqx/src/emqx_shared_sub.erl
@@ -136,11 +136,11 @@ dispatch(Group, Topic, Delivery = #delivery{message = Msg}, FailedSubs) ->
 
 -spec(strategy() -> strategy()).
 strategy() ->
-    emqx_config:get([broker, shared_subscription_strategy]).
+    emqx:get_config([broker, shared_subscription_strategy]).
 
 -spec(ack_enabled() -> boolean()).
 ack_enabled() ->
-    emqx_config:get([broker, shared_dispatch_ack_enabled]).
+    emqx:get_config([broker, shared_dispatch_ack_enabled]).
 
 do_dispatch(SubPid, Topic, Msg, _Type) when SubPid =:= self() ->
     %% Deadlock otherwise
diff --git a/apps/emqx/src/emqx_sys.erl b/apps/emqx/src/emqx_sys.erl
index 6baae8c1e..70043e2bb 100644
--- a/apps/emqx/src/emqx_sys.erl
+++ b/apps/emqx/src/emqx_sys.erl
@@ -102,10 +102,10 @@ datetime() ->
             "~4..0w-~2..0w-~2..0w ~2..0w:~2..0w:~2..0w", [Y, M, D, H, MM, S])).
 
 sys_interval() ->
-    emqx_config:get([broker, sys_msg_interval]).
+    emqx:get_config([broker, sys_msg_interval]).
 
 sys_heatbeat_interval() ->
-    emqx_config:get([broker, sys_heartbeat_interval]).
+    emqx:get_config([broker, sys_heartbeat_interval]).
 
 %% @doc Get sys info
 -spec(info() -> list(tuple())).
diff --git a/apps/emqx/src/emqx_sys_mon.erl b/apps/emqx/src/emqx_sys_mon.erl
index 0b981ffec..80f5e49ec 100644
--- a/apps/emqx/src/emqx_sys_mon.erl
+++ b/apps/emqx/src/emqx_sys_mon.erl
@@ -60,7 +60,7 @@ start_timer(State) ->
     State#{timer := emqx_misc:start_timer(timer:seconds(2), reset)}.
 
 sysm_opts() ->
-    sysm_opts(maps:to_list(emqx_config:get([sysmon, vm])), []).
+    sysm_opts(maps:to_list(emqx:get_config([sysmon, vm])), []).
 sysm_opts([], Acc) ->
     Acc;
 sysm_opts([{_, disabled}|Opts], Acc) ->
diff --git a/apps/emqx/src/emqx_trie.erl b/apps/emqx/src/emqx_trie.erl
index 32c176b65..ebfcfcbe3 100644
--- a/apps/emqx/src/emqx_trie.erl
+++ b/apps/emqx/src/emqx_trie.erl
@@ -270,7 +270,7 @@ match_compact([Word | Words], Prefix, IsWildcard, Acc0) ->
     lookup_topic(MlTopic).
 
 is_compact() ->
-    emqx_config:get([broker, perf, trie_compaction], true).
+    emqx:get_config([broker, perf, trie_compaction], true).
 
 set_compact(Bool) ->
     emqx_config:put([broker, perf, trie_compaction], Bool).
diff --git a/apps/emqx/src/emqx_vm_mon.erl b/apps/emqx/src/emqx_vm_mon.erl
index 13a470959..51710b5b5 100644
--- a/apps/emqx/src/emqx_vm_mon.erl
+++ b/apps/emqx/src/emqx_vm_mon.erl
@@ -57,8 +57,8 @@ handle_cast(Msg, State) ->
     {noreply, State}.
 
 handle_info({timeout, _Timer, check}, State) ->
-    ProcHighWatermark = emqx_config:get([sysmon, vm, process_high_watermark]),
-    ProcLowWatermark = emqx_config:get([sysmon, vm, process_low_watermark]),
+    ProcHighWatermark = emqx:get_config([sysmon, vm, process_high_watermark]),
+    ProcLowWatermark = emqx:get_config([sysmon, vm, process_low_watermark]),
     ProcessCount = erlang:system_info(process_count),
     case ProcessCount / erlang:system_info(process_limit) of
         Percent when Percent >= ProcHighWatermark ->
@@ -89,5 +89,5 @@ code_change(_OldVsn, State, _Extra) ->
 %%--------------------------------------------------------------------
 
 start_check_timer() ->
-    Interval = emqx_config:get([sysmon, vm, process_check_interval]),
+    Interval = emqx:get_config([sysmon, vm, process_check_interval]),
     emqx_misc:start_timer(Interval, check).
diff --git a/apps/emqx/test/emqx_mqtt_caps_SUITE.erl b/apps/emqx/test/emqx_mqtt_caps_SUITE.erl
index c01420f49..f8b5a7ab6 100644
--- a/apps/emqx/test/emqx_mqtt_caps_SUITE.erl
+++ b/apps/emqx/test/emqx_mqtt_caps_SUITE.erl
@@ -25,7 +25,7 @@
 all() -> emqx_ct:all(?MODULE).
 
 t_check_pub(_) ->
-    OldConf = emqx_config:get([zones]),
+    OldConf = emqx:get_config([zones]),
     emqx_config:put_zone_conf(default, [mqtt, max_qos_allowed], ?QOS_1),
     emqx_config:put_zone_conf(default, [mqtt, retain_available], false),
     timer:sleep(50),
@@ -39,7 +39,7 @@ t_check_pub(_) ->
     emqx_config:put([zones], OldConf).
 
 t_check_sub(_) ->
-    OldConf = emqx_config:get([zones]),
+    OldConf = emqx:get_config([zones]),
     SubOpts = #{rh  => 0,
                 rap => 0,
                 nl  => 0,
diff --git a/apps/emqx_authn/src/emqx_authn_app.erl b/apps/emqx_authn/src/emqx_authn_app.erl
index bd9ec9cfe..7518e5a01 100644
--- a/apps/emqx_authn/src/emqx_authn_app.erl
+++ b/apps/emqx_authn/src/emqx_authn_app.erl
@@ -36,7 +36,7 @@ stop(_State) ->
     ok.
 
 initialize() ->
-    AuthNConfig = emqx_config:get([authentication], #{enable => false,
+    AuthNConfig = emqx:get_config([authentication], #{enable => false,
                                                       authenticators => []}),
     initialize(AuthNConfig).
 
diff --git a/apps/emqx_authz/src/emqx_authz.erl b/apps/emqx_authz/src/emqx_authz.erl
index 6197cd685..e3e540de0 100644
--- a/apps/emqx_authz/src/emqx_authz.erl
+++ b/apps/emqx_authz/src/emqx_authz.erl
@@ -47,7 +47,7 @@ register_metrics() ->
 init() ->
     ok = register_metrics(),
     emqx_config_handler:add_handler(?CONF_KEY_PATH, ?MODULE),
-    NRules = [init_rule(Rule) || Rule <- emqx_config:get(?CONF_KEY_PATH, [])],
+    NRules = [init_rule(Rule) || Rule <- emqx:get_config(?CONF_KEY_PATH, [])],
     ok = emqx_hooks:add('client.authorize', {?MODULE, authorize, [NRules]}, -1).
 
 lookup() ->
diff --git a/apps/emqx_authz/test/emqx_authz_SUITE.erl b/apps/emqx_authz/test/emqx_authz_SUITE.erl
index 514b0d48b..0452ff96c 100644
--- a/apps/emqx_authz/test/emqx_authz_SUITE.erl
+++ b/apps/emqx_authz/test/emqx_authz_SUITE.erl
@@ -87,7 +87,7 @@ t_update_rule(_) ->
     {ok, _} = emqx_authz:update(tail, [?RULE3]),
 
     Lists1 = emqx_authz:check_rules([?RULE1, ?RULE2, ?RULE3]),
-    ?assertMatch(Lists1, emqx_config:get([authorization, rules], [])),
+    ?assertMatch(Lists1, emqx:get_config([authorization, rules], [])),
 
     [#{annotations := #{id := Id1,
                         principal := all,
@@ -109,7 +109,7 @@ t_update_rule(_) ->
 
     {ok, _} = emqx_authz:update({replace_once, Id3}, ?RULE4),
     Lists2 = emqx_authz:check_rules([?RULE1, ?RULE2, ?RULE4]),
-    ?assertMatch(Lists2, emqx_config:get([authorization, rules], [])),
+    ?assertMatch(Lists2, emqx:get_config([authorization, rules], [])),
 
     [#{annotations := #{id := Id1,
                         principal := all,
diff --git a/apps/emqx_bridge_mqtt/src/emqx_bridge_mqtt_sup.erl b/apps/emqx_bridge_mqtt/src/emqx_bridge_mqtt_sup.erl
index ef4d076a4..4207067fe 100644
--- a/apps/emqx_bridge_mqtt/src/emqx_bridge_mqtt_sup.erl
+++ b/apps/emqx_bridge_mqtt/src/emqx_bridge_mqtt_sup.erl
@@ -39,7 +39,7 @@ start_link() ->
     supervisor:start_link({local, ?MODULE}, ?MODULE, []).
 
 init([]) ->
-    BridgesConf = emqx_config:get([?APP, bridges], []),
+    BridgesConf = emqx:get_config([?APP, bridges], []),
     BridgeSpec = lists:map(fun bridge_spec/1, BridgesConf),
     SupFlag = #{strategy => one_for_one,
                 intensity => 100,
diff --git a/apps/emqx_dashboard/src/emqx_dashboard.erl b/apps/emqx_dashboard/src/emqx_dashboard.erl
index adbdbc8e7..fb0e25564 100644
--- a/apps/emqx_dashboard/src/emqx_dashboard.erl
+++ b/apps/emqx_dashboard/src/emqx_dashboard.erl
@@ -98,7 +98,7 @@ stop_listener({Proto, Port, _}) ->
 listeners() ->
     [{Protocol, Port, maps:to_list(maps:without([protocol, port], Map))}
         || Map = #{protocol := Protocol,port := Port}
-        <- emqx_config:get([emqx_dashboard, listeners], [])].
+        <- emqx:get_config([emqx_dashboard, listeners], [])].
 
 listener_name(Proto) ->
     list_to_atom(atom_to_list(Proto) ++ ":dashboard").
diff --git a/apps/emqx_dashboard/src/emqx_dashboard_admin.erl b/apps/emqx_dashboard/src/emqx_dashboard_admin.erl
index b32d3d346..982756805 100644
--- a/apps/emqx_dashboard/src/emqx_dashboard_admin.erl
+++ b/apps/emqx_dashboard/src/emqx_dashboard_admin.erl
@@ -201,7 +201,7 @@ add_default_user() ->
     add_default_user(binenv(default_username), binenv(default_password)).
 
 binenv(Key) ->
-    iolist_to_binary(emqx_config:get([emqx_dashboard, Key], "")).
+    iolist_to_binary(emqx:get_config([emqx_dashboard, Key], "")).
 
 add_default_user(Username, Password) when ?EMPTY_KEY(Username) orelse ?EMPTY_KEY(Password) ->
     igonre;
diff --git a/apps/emqx_dashboard/src/emqx_dashboard_collection.erl b/apps/emqx_dashboard/src/emqx_dashboard_collection.erl
index 91d60e1ab..8b0576342 100644
--- a/apps/emqx_dashboard/src/emqx_dashboard_collection.erl
+++ b/apps/emqx_dashboard/src/emqx_dashboard_collection.erl
@@ -58,7 +58,7 @@ get_collect() -> gen_server:call(whereis(?MODULE), get_collect).
 init([]) ->
     timer(next_interval(), collect),
     timer(get_today_remaining_seconds(), clear_expire_data),
-    ExpireInterval = emqx_config:get([emqx_dashboard, monitor, interval], ?EXPIRE_INTERVAL),
+    ExpireInterval = emqx:get_config([emqx_dashboard, monitor, interval], ?EXPIRE_INTERVAL),
     State = #{
         count => count(),
         expire_interval => ExpireInterval,
@@ -78,7 +78,7 @@ next_interval() ->
     (1000 * interval()) - (erlang:system_time(millisecond) rem (1000 * interval())) - 1.
 
 interval() ->
-    emqx_config:get([?APP, sample_interval], ?DEFAULT_INTERVAL).
+    emqx:get_config([?APP, sample_interval], ?DEFAULT_INTERVAL).
 
 count() ->
     60 div interval().
diff --git a/apps/emqx_dashboard/src/emqx_dashboard_token.erl b/apps/emqx_dashboard/src/emqx_dashboard_token.erl
index fdba7fb7e..432a64621 100644
--- a/apps/emqx_dashboard/src/emqx_dashboard_token.erl
+++ b/apps/emqx_dashboard/src/emqx_dashboard_token.erl
@@ -148,7 +148,7 @@ jwk(Username, Password, Salt) ->
     }.
 
 jwt_expiration_time() ->
-    ExpTime = emqx_config:get([emqx_dashboard, token_expired_time], ?EXPTIME),
+    ExpTime = emqx:get_config([emqx_dashboard, token_expired_time], ?EXPTIME),
     erlang:system_time(millisecond) + ExpTime.
 
 salt() ->
diff --git a/apps/emqx_data_bridge/src/emqx_data_bridge.erl b/apps/emqx_data_bridge/src/emqx_data_bridge.erl
index 17527ca3a..52cea80fb 100644
--- a/apps/emqx_data_bridge/src/emqx_data_bridge.erl
+++ b/apps/emqx_data_bridge/src/emqx_data_bridge.erl
@@ -27,7 +27,7 @@
         ]).
 
 load_bridges() ->
-    Bridges = emqx_config:get([emqx_data_bridge, bridges], []),
+    Bridges = emqx:get_config([emqx_data_bridge, bridges], []),
     emqx_data_bridge_monitor:ensure_all_started(Bridges).
 
 resource_type(mysql) -> emqx_connector_mysql;
diff --git a/apps/emqx_exhook/src/emqx_exhook_sup.erl b/apps/emqx_exhook/src/emqx_exhook_sup.erl
index 32f8fa472..60a6a2915 100644
--- a/apps/emqx_exhook/src/emqx_exhook_sup.erl
+++ b/apps/emqx_exhook/src/emqx_exhook_sup.erl
@@ -58,7 +58,7 @@ request_options() ->
      }.
 
 env(Key, Def) ->
-    emqx_config:get([exhook, Key], Def).
+    emqx:get_config([exhook, Key], Def).
 
 %%--------------------------------------------------------------------
 %% APIs
diff --git a/apps/emqx_gateway/src/emqx_gateway_app.erl b/apps/emqx_gateway/src/emqx_gateway_app.erl
index b27319eac..adc546767 100644
--- a/apps/emqx_gateway/src/emqx_gateway_app.erl
+++ b/apps/emqx_gateway/src/emqx_gateway_app.erl
@@ -79,4 +79,4 @@ load_gateway_by_default([{Type, Confs}|More]) ->
     load_gateway_by_default(More).
 
 confs() ->
-    maps:to_list(emqx_config:get([gateway], [])).
+    maps:to_list(emqx:get_config([gateway], [])).
diff --git a/apps/emqx_management/src/emqx_mgmt.erl b/apps/emqx_management/src/emqx_mgmt.erl
index 7fb700c55..4a7fefb2d 100644
--- a/apps/emqx_management/src/emqx_mgmt.erl
+++ b/apps/emqx_management/src/emqx_mgmt.erl
@@ -590,7 +590,7 @@ check_row_limit([Tab|Tables], Limit) ->
     end.
 
 max_row_limit() ->
-    emqx_config:get([?APP, max_row_limit], ?MAX_ROW_LIMIT).
+    emqx:get_config([?APP, max_row_limit], ?MAX_ROW_LIMIT).
 
 table_size(Tab) -> ets:info(Tab, size).
 
diff --git a/apps/emqx_management/src/emqx_mgmt_api_configs.erl b/apps/emqx_management/src/emqx_mgmt_api_configs.erl
index 15849c294..b54e357d6 100644
--- a/apps/emqx_management/src/emqx_mgmt_api_configs.erl
+++ b/apps/emqx_management/src/emqx_mgmt_api_configs.erl
@@ -56,7 +56,7 @@ api_spec() ->
 
 config_apis() ->
     [config_api(ConfPath, Schema) || {ConfPath, Schema} <-
-     get_conf_schema(emqx_config:get([]), ?MAX_DEPTH), is_core_conf(ConfPath)].
+     get_conf_schema(emqx:get_config([]), ?MAX_DEPTH), is_core_conf(ConfPath)].
 
 config_api(ConfPath, Schema) ->
     Path = path_join(ConfPath),
@@ -131,7 +131,7 @@ config_reset(post, Req) ->
 
 get_full_config() ->
     emqx_map_lib:jsonable_map(
-        emqx_config:fill_defaults(emqx_config:get_raw([]))).
+        emqx_config:fill_defaults(emqx:get_raw_config([]))).
 
 conf_path_from_querystr(Req) ->
     case proplists:get_value(<<"conf_path">>, cowboy_req:parse_qs(Req)) of
diff --git a/apps/emqx_management/src/emqx_mgmt_auth.erl b/apps/emqx_management/src/emqx_mgmt_auth.erl
index 7fb120017..73ec37fc2 100644
--- a/apps/emqx_management/src/emqx_mgmt_auth.erl
+++ b/apps/emqx_management/src/emqx_mgmt_auth.erl
@@ -68,7 +68,7 @@ mnesia(copy) ->
 %%--------------------------------------------------------------------
 -spec(add_default_app() -> list()).
 add_default_app() ->
-    Apps = emqx_config:get([?APP, applications], []),
+    Apps = emqx:get_config([?APP, applications], []),
     [ begin
           case {AppId, AppSecret} of
               {undefined, _} -> ok;
diff --git a/apps/emqx_management/src/emqx_mgmt_http.erl b/apps/emqx_management/src/emqx_mgmt_http.erl
index c795e1de7..7bd393904 100644
--- a/apps/emqx_management/src/emqx_mgmt_http.erl
+++ b/apps/emqx_management/src/emqx_mgmt_http.erl
@@ -94,7 +94,7 @@ stop_listener({Proto, Port, _}) ->
 listeners() ->
     [{Protocol, Port, maps:to_list(maps:without([protocol, port], Map))}
         || Map = #{protocol := Protocol,port := Port}
-        <- emqx_config:get([emqx_management, listeners], [])].
+        <- emqx:get_config([emqx_management, listeners], [])].
 
 listener_name(Proto) ->
     list_to_atom(atom_to_list(Proto) ++ ":management").
diff --git a/apps/emqx_modules/src/emqx_delayed.erl b/apps/emqx_modules/src/emqx_delayed.erl
index 5e1754f4b..00532e25e 100644
--- a/apps/emqx_modules/src/emqx_delayed.erl
+++ b/apps/emqx_modules/src/emqx_delayed.erl
@@ -104,7 +104,7 @@ on_message_publish(Msg) ->
 
 -spec(start_link() -> emqx_types:startlink_ret()).
 start_link() ->
-    Opts = emqx_config:get([delayed], #{}),
+    Opts = emqx:get_config([delayed], #{}),
     gen_server:start_link({local, ?SERVER}, ?MODULE, [Opts], []).
 
 -spec(store(#delayed_message{}) -> ok | {error, atom()}).
diff --git a/apps/emqx_modules/src/emqx_delayed_api.erl b/apps/emqx_modules/src/emqx_delayed_api.erl
index 06de3ab13..9d4edd940 100644
--- a/apps/emqx_modules/src/emqx_delayed_api.erl
+++ b/apps/emqx_modules/src/emqx_delayed_api.erl
@@ -179,4 +179,4 @@ rpc_call(Node, Module, Fun, Args) ->
     end.
 
 get_status() ->
-    emqx_config:get([delayed, enable], true).
+    emqx:get_config([delayed, enable], true).
diff --git a/apps/emqx_modules/src/emqx_event_message.erl b/apps/emqx_modules/src/emqx_event_message.erl
index 3bdc54c2b..5017ed3e4 100644
--- a/apps/emqx_modules/src/emqx_event_message.erl
+++ b/apps/emqx_modules/src/emqx_event_message.erl
@@ -38,7 +38,7 @@
 -endif.
 
 enable() ->
-    Topics = emqx_config:get([event_message, topics], []),
+    Topics = emqx:get_config([event_message, topics], []),
     lists:foreach(fun(Topic) ->
         case Topic of
             <<"$event/client_connected">> ->
@@ -61,7 +61,7 @@ enable() ->
     end, Topics).
 
 disable() ->
-    Topics = emqx_config:get([event_message, topics], []),
+    Topics = emqx:get_config([event_message, topics], []),
     lists:foreach(fun(Topic) ->
         case Topic of
             <<"$event/client_connected">> ->
diff --git a/apps/emqx_modules/src/emqx_modules_app.erl b/apps/emqx_modules/src/emqx_modules_app.erl
index e969fc6dd..889c566b1 100644
--- a/apps/emqx_modules/src/emqx_modules_app.erl
+++ b/apps/emqx_modules/src/emqx_modules_app.erl
@@ -32,17 +32,17 @@ stop(_State) ->
     ok.
 
 maybe_enable_modules() ->
-    emqx_config:get([delayed, enable], true) andalso emqx_delayed:enable(),
-    emqx_config:get([telemetry, enable], true) andalso emqx_telemetry:enable(),
-    emqx_config:get([recon, enable], true) andalso emqx_recon:enable(),
+    emqx:get_config([delayed, enable], true) andalso emqx_delayed:enable(),
+    emqx:get_config([telemetry, enable], true) andalso emqx_telemetry:enable(),
+    emqx:get_config([recon, enable], true) andalso emqx_recon:enable(),
     emqx_event_message:enable(),
     emqx_rewrite:enable(),
     emqx_topic_metrics:enable().
 
 maybe_disable_modules() ->
-    emqx_config:get([delayed, enable], true) andalso emqx_delayed:disable(),
-    emqx_config:get([telemetry, enable], true) andalso emqx_telemetry:disable(),
-    emqx_config:get([recon, enable], true) andalso emqx_recon:disable(),
+    emqx:get_config([delayed, enable], true) andalso emqx_delayed:disable(),
+    emqx:get_config([telemetry, enable], true) andalso emqx_telemetry:disable(),
+    emqx:get_config([recon, enable], true) andalso emqx_recon:disable(),
     emqx_event_message:disable(),
     emqx_rewrite:disable(),
     emqx_topic_metrics:disable().
diff --git a/apps/emqx_modules/src/emqx_rewrite.erl b/apps/emqx_modules/src/emqx_rewrite.erl
index ec5a7d5ba..9a6c0574b 100644
--- a/apps/emqx_modules/src/emqx_rewrite.erl
+++ b/apps/emqx_modules/src/emqx_rewrite.erl
@@ -43,7 +43,7 @@
 %%--------------------------------------------------------------------
 
 enable() ->
-    Rules = emqx_config:get([rewrite, rules], []),
+    Rules = emqx:get_config([rewrite, rules], []),
     register_hook(Rules).
 
 disable() ->
@@ -52,10 +52,10 @@ disable() ->
     emqx_hooks:del('message.publish',    {?MODULE, rewrite_publish}).
 
 list() ->
-    maps:get(<<"rules">>, emqx_config:get_raw([<<"rewrite">>], #{}), []).
+    maps:get(<<"rules">>, emqx:get_raw_config([<<"rewrite">>], #{}), []).
 
 update(Rules0) ->
-    Rewrite = emqx_config:get_raw([<<"rewrite">>], #{}),
+    Rewrite = emqx:get_raw_config([<<"rewrite">>], #{}),
     {ok, #{config := Config}} = emqx:update_config([rewrite], maps:put(<<"rules">>,
         Rules0, Rewrite)),
     Rules = maps:get(rules, maps:get(rewrite, Config, #{}), []),
diff --git a/apps/emqx_modules/src/emqx_telemetry.erl b/apps/emqx_modules/src/emqx_telemetry.erl
index c9a78e736..aa207ac95 100644
--- a/apps/emqx_modules/src/emqx_telemetry.erl
+++ b/apps/emqx_modules/src/emqx_telemetry.erl
@@ -107,7 +107,7 @@ mnesia(copy) ->
 %%--------------------------------------------------------------------
 
 start_link() ->
-    Opts = emqx_config:get([telemetry], #{}),
+    Opts = emqx:get_config([telemetry], #{}),
     gen_server:start_link({local, ?MODULE}, ?MODULE, [Opts], []).
 
 stop() ->
@@ -120,7 +120,7 @@ disable() ->
     gen_server:call(?MODULE, disable).
 
 get_status() ->
-    emqx_config:get([telemetry, enable], true).
+    emqx:get_config([telemetry, enable], true).
 
 get_uuid() ->
     gen_server:call(?MODULE, get_uuid).
diff --git a/apps/emqx_modules/src/emqx_topic_metrics.erl b/apps/emqx_modules/src/emqx_topic_metrics.erl
index 5e6a3bc98..fa226c9a0 100644
--- a/apps/emqx_modules/src/emqx_topic_metrics.erl
+++ b/apps/emqx_modules/src/emqx_topic_metrics.erl
@@ -137,7 +137,7 @@ on_message_dropped(#message{topic = Topic}, _, _) ->
     end.
 
 start_link() ->
-    Opts = emqx_config:get([topic_metrics], #{}),
+    Opts = emqx:get_config([topic_metrics], #{}),
     gen_server:start_link({local, ?MODULE}, ?MODULE, [Opts], []).
 
 stop() ->
diff --git a/apps/emqx_plugin_libs/src/emqx_plugin_libs_ssl.erl b/apps/emqx_plugin_libs/src/emqx_plugin_libs_ssl.erl
index 3fac97e86..e51a4b6a6 100644
--- a/apps/emqx_plugin_libs/src/emqx_plugin_libs_ssl.erl
+++ b/apps/emqx_plugin_libs/src/emqx_plugin_libs_ssl.erl
@@ -45,7 +45,7 @@
 -spec save_files_return_opts(opts_input(), atom() | string() | binary(),
                              string() | binary()) -> opts().
 save_files_return_opts(Options, SubDir, ResId) ->
-    Dir = filename:join([emqx_config:get([node, data_dir]), SubDir, ResId]),
+    Dir = filename:join([emqx:get_config([node, data_dir]), SubDir, ResId]),
     save_files_return_opts(Options, Dir).
 
 %% @doc Parse ssl options input.
@@ -76,7 +76,7 @@ save_files_return_opts(Options, Dir) ->
 %% empty string is returned if the input is empty.
 -spec save_file(file_input(), atom() | string() | binary()) -> string().
 save_file(Param, SubDir) ->
-   Dir = filename:join([emqx_config:get([node, data_dir]), SubDir]),
+   Dir = filename:join([emqx:get_config([node, data_dir]), SubDir]),
    do_save_file(Param, Dir).
 
 filter([]) -> [];
diff --git a/apps/emqx_prometheus/src/emqx_prometheus_api.erl b/apps/emqx_prometheus/src/emqx_prometheus_api.erl
index 63b8b6a10..a2ac3b708 100644
--- a/apps/emqx_prometheus/src/emqx_prometheus_api.erl
+++ b/apps/emqx_prometheus/src/emqx_prometheus_api.erl
@@ -106,7 +106,7 @@ prometheus_api() ->
 %     {"/prometheus/stats", Metadata, stats}.
 
 prometheus(get, _Request) ->
-    Response = emqx_config:get_raw([<<"prometheus">>], #{}),
+    Response = emqx:get_raw_config([<<"prometheus">>], #{}),
     {200, Response};
 
 prometheus(put, Request) ->
@@ -128,11 +128,11 @@ prometheus(put, Request) ->
 
 enable_prometheus(true) ->
     ok = emqx_prometheus_sup:stop_child(?APP),
-    emqx_prometheus_sup:start_child(?APP, emqx_config:get([prometheus], #{})),
+    emqx_prometheus_sup:start_child(?APP, emqx:get_config([prometheus], #{})),
     {200};
 enable_prometheus(false) ->
     _ = emqx_prometheus_sup:stop_child(?APP),
     {200}.
 
 get_raw(Key, Def) ->
-    emqx_config:get_raw([<<"prometheus">>] ++ [Key], Def).
+    emqx:get_raw_config([<<"prometheus">>] ++ [Key], Def).
diff --git a/apps/emqx_prometheus/src/emqx_prometheus_app.erl b/apps/emqx_prometheus/src/emqx_prometheus_app.erl
index f4d4fd164..4f954a792 100644
--- a/apps/emqx_prometheus/src/emqx_prometheus_app.erl
+++ b/apps/emqx_prometheus/src/emqx_prometheus_app.erl
@@ -34,9 +34,9 @@ stop(_State) ->
     ok.
 
 maybe_enable_prometheus() ->
-    case emqx_config:get([prometheus, enable], false) of
+    case emqx:get_config([prometheus, enable], false) of
         true ->
-            emqx_prometheus_sup:start_child(?APP, emqx_config:get([prometheus], #{}));
+            emqx_prometheus_sup:start_child(?APP, emqx:get_config([prometheus], #{}));
         false ->
             ok
     end.
diff --git a/apps/emqx_retainer/src/emqx_retainer.erl b/apps/emqx_retainer/src/emqx_retainer.erl
index acd119dee..dfbe5cc69 100644
--- a/apps/emqx_retainer/src/emqx_retainer.erl
+++ b/apps/emqx_retainer/src/emqx_retainer.erl
@@ -129,7 +129,7 @@ deliver(Result, #{context_id := Id} = Context, Pid, Topic, Cursor) ->
         false ->
             ok;
         _ ->
-            #{msg_deliver_quota := MaxDeliverNum} = emqx_config:get([?APP, flow_control]),
+            #{msg_deliver_quota := MaxDeliverNum} = emqx:get_config([?APP, flow_control]),
             case MaxDeliverNum of
                 0 ->
                     _ = [Pid ! {deliver, Topic, Msg} || Msg <- Result],
@@ -150,7 +150,7 @@ get_expiry_time(#message{headers = #{properties := #{'Message-Expiry-Interval' :
                          timestamp = Ts}) ->
     Ts + Interval * 1000;
 get_expiry_time(#message{timestamp = Ts}) ->
-    Interval = emqx_config:get([?APP, msg_expiry_interval], ?DEF_EXPIRY_INTERVAL),
+    Interval = emqx:get_config([?APP, msg_expiry_interval], ?DEF_EXPIRY_INTERVAL),
     case Interval of
         0 -> 0;
         _ -> Ts + Interval
@@ -173,7 +173,7 @@ delete(Topic) ->
 init([]) ->
     init_shared_context(),
     State = new_state(),
-    #{enable := Enable} = Cfg = emqx_config:get([?APP]),
+    #{enable := Enable} = Cfg = emqx:get_config([?APP]),
     {ok,
      case Enable of
          true ->
@@ -209,7 +209,7 @@ handle_cast(Msg, State) ->
 handle_info(clear_expired, #{context := Context} = State) ->
     Mod = get_backend_module(),
     Mod:clear_expired(Context),
-    Interval = emqx_config:get([?APP, msg_clear_interval], ?DEF_EXPIRY_INTERVAL),
+    Interval = emqx:get_config([?APP, msg_clear_interval], ?DEF_EXPIRY_INTERVAL),
     {noreply, State#{clear_timer := add_timer(Interval, clear_expired)}, hibernate};
 
 handle_info(release_deliver_quota, #{context := Context, wait_quotas := Waits} = State) ->
@@ -225,7 +225,7 @@ handle_info(release_deliver_quota, #{context := Context, wait_quotas := Waits} =
                           end,
                           Waits2)
     end,
-    Interval = emqx_config:get([?APP, flow_control, quota_release_interval]),
+    Interval = emqx:get_config([?APP, flow_control, quota_release_interval]),
     {noreply, State#{release_quota_timer := add_timer(Interval, release_deliver_quota),
                      wait_quotas := []}};
 
@@ -258,7 +258,7 @@ new_context(Id) ->
     #{context_id => Id}.
 
 is_too_big(Size) ->
-    Limit = emqx_config:get([?APP, max_payload_size], ?DEF_MAX_PAYLOAD_SIZE),
+    Limit = emqx:get_config([?APP, max_payload_size], ?DEF_MAX_PAYLOAD_SIZE),
     Limit > 0 andalso (Size > Limit).
 
 %% @private
@@ -332,7 +332,7 @@ insert_shared_context(Key, Term) ->
 
 -spec get_msg_deliver_quota() -> non_neg_integer().
 get_msg_deliver_quota() ->
-    emqx_config:get([?APP, flow_control, msg_deliver_quota]).
+    emqx:get_config([?APP, flow_control, msg_deliver_quota]).
 
 -spec update_config(state(), hocons:config()) -> state().
 update_config(#{clear_timer := ClearTimer,
@@ -342,7 +342,7 @@ update_config(#{clear_timer := ClearTimer,
       flow_control := #{quota_release_interval := QuotaInterval},
       msg_clear_interval := ClearInterval} = Conf,
 
-    #{config := OldConfig} = emqx_config:get([?APP]),
+    #{config := OldConfig} = emqx:get_config([?APP]),
 
     case Enable of
         true ->
@@ -416,7 +416,7 @@ check_timer(Timer, _, _) ->
 
 -spec get_backend_module() -> backend().
 get_backend_module() ->
-    #{type := Backend} = emqx_config:get([?APP, config]),
+    #{type := Backend} = emqx:get_config([?APP, config]),
     ModName = if Backend =:= built_in_database ->
                       mnesia;
                  true ->
diff --git a/apps/emqx_retainer/src/emqx_retainer_api.erl b/apps/emqx_retainer/src/emqx_retainer_api.erl
index 1b5b8adcc..a0b72c858 100644
--- a/apps/emqx_retainer/src/emqx_retainer_api.erl
+++ b/apps/emqx_retainer/src/emqx_retainer_api.erl
@@ -35,7 +35,7 @@
         ]).
 
 lookup_config(_Bindings, _Params) ->
-    Config = emqx_config:get([emqx_retainer]),
+    Config = emqx:get_config([emqx_retainer]),
     return({ok, Config}).
 
 update_config(_Bindings, Params) ->
diff --git a/apps/emqx_retainer/src/emqx_retainer_mnesia.erl b/apps/emqx_retainer/src/emqx_retainer_mnesia.erl
index 34e3e49db..1c9956050 100644
--- a/apps/emqx_retainer/src/emqx_retainer_mnesia.erl
+++ b/apps/emqx_retainer/src/emqx_retainer_mnesia.erl
@@ -130,7 +130,7 @@ read_message(_, Topic) ->
     {ok, read_messages(Topic)}.
 
 match_messages(_, Topic, Cursor) ->
-    MaxReadNum = emqx_config:get([?APP, flow_control, max_read_number]),
+    MaxReadNum = emqx:get_config([?APP, flow_control, max_read_number]),
     case Cursor of
         undefined ->
             case MaxReadNum of
@@ -227,7 +227,7 @@ make_match_spec(Filter) ->
 
 -spec is_table_full() -> boolean().
 is_table_full() ->
-    #{max_retained_messages := Limit} = emqx_config:get([?APP, config]),
+    #{max_retained_messages := Limit} = emqx:get_config([?APP, config]),
     Limit > 0 andalso (table_size() >= Limit).
 
 -spec table_size() -> non_neg_integer().
diff --git a/apps/emqx_rule_actions/src/emqx_bridge_mqtt_actions.erl b/apps/emqx_rule_actions/src/emqx_bridge_mqtt_actions.erl
index 8d17ee6f5..194fc4096 100644
--- a/apps/emqx_rule_actions/src/emqx_bridge_mqtt_actions.erl
+++ b/apps/emqx_rule_actions/src/emqx_bridge_mqtt_actions.erl
@@ -506,7 +506,7 @@ connect(Options) when is_list(Options) ->
 connect(Options = #{disk_cache := DiskCache, ecpool_worker_id := Id, pool_name := Pool}) ->
     Options0 = case DiskCache of
                    true ->
-                       DataDir = filename:join([emqx_config:get([node, data_dir]), replayq, Pool, integer_to_list(Id)]),
+                       DataDir = filename:join([emqx:get_config([node, data_dir]), replayq, Pool, integer_to_list(Id)]),
                        QueueOption = #{replayq_dir => DataDir},
                        Options#{queue => QueueOption};
                    false ->
diff --git a/apps/emqx_rule_engine/src/emqx_rule_events.erl b/apps/emqx_rule_engine/src/emqx_rule_events.erl
index 6eacced42..8154170b0 100644
--- a/apps/emqx_rule_engine/src/emqx_rule_events.erl
+++ b/apps/emqx_rule_engine/src/emqx_rule_events.erl
@@ -595,4 +595,4 @@ printable_maps(Headers) ->
 
 ignore_sys_message(#message{flags = Flags}) ->
     maps:get(sys, Flags, false) andalso
-      emqx_config:get([emqx_rule_engine, ignore_sys_message]).
+      emqx:get_config([emqx_rule_engine, ignore_sys_message]).
diff --git a/apps/emqx_statsd/src/emqx_statsd_api.erl b/apps/emqx_statsd/src/emqx_statsd_api.erl
index 25f0d1879..3325d8c71 100644
--- a/apps/emqx_statsd/src/emqx_statsd_api.erl
+++ b/apps/emqx_statsd/src/emqx_statsd_api.erl
@@ -84,7 +84,7 @@ statsd_api() ->
     [{"/statsd", Metadata, statsd}].
 
 statsd(get, _Request) ->
-    Response = emqx_config:get_raw([<<"statsd">>], #{}),
+    Response = emqx:get_raw_config([<<"statsd">>], #{}),
     {200, Response};
 
 statsd(put, Request) ->
@@ -96,11 +96,11 @@ statsd(put, Request) ->
 
 enable_statsd(true) ->
     ok = emqx_statsd_sup:stop_child(?APP),
-    emqx_statsd_sup:start_child(?APP, emqx_config:get([statsd], #{})),
+    emqx_statsd_sup:start_child(?APP, emqx:get_config([statsd], #{})),
     {200};
 enable_statsd(false) ->
     _ = emqx_statsd_sup:stop_child(?APP),
     {200}.
 
 get_raw(Key, Def) ->
-    emqx_config:get_raw([<<"statsd">>]++ [Key], Def).
+    emqx:get_raw_config([<<"statsd">>]++ [Key], Def).
diff --git a/apps/emqx_statsd/src/emqx_statsd_app.erl b/apps/emqx_statsd/src/emqx_statsd_app.erl
index 6dd9dc5c7..4a5ff0496 100644
--- a/apps/emqx_statsd/src/emqx_statsd_app.erl
+++ b/apps/emqx_statsd/src/emqx_statsd_app.erl
@@ -32,9 +32,9 @@ stop(_) ->
     ok.
 
 maybe_enable_statsd() ->
-    case emqx_config:get([statsd, enable], false) of
+    case emqx:get_config([statsd, enable], false) of
         true ->
-            emqx_statsd_sup:start_child(?APP, emqx_config:get([statsd], #{}));
+            emqx_statsd_sup:start_child(?APP, emqx:get_config([statsd], #{}));
         false ->
             ok
     end.