diff --git a/.gitmodules b/.gitmodules
index 093a4a897..4015d5e02 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,9 @@
 [submodule "plugins/emqttd_dashboard"]
 	path = plugins/emqttd_dashboard
 	url = https://github.com/emqtt/emqttd_dashboard.git
+[submodule "plugins/emysql"]
+	path = plugins/emysql
+	url = https://github.com/erylee/emysql.git
+[submodule "plugins/emqttd_plugin_mysql"]
+	path = plugins/emqttd_plugin_mysql
+	url = https://github.com/emqtt/emqttd_plugin_mysql.git
diff --git a/Makefile b/Makefile
index 2d8b5b01a..b319d3928 100644
--- a/Makefile
+++ b/Makefile
@@ -29,11 +29,14 @@ edoc:
 	@$(REBAR) doc
 
 rel: compile
-	@cd rel && ../rebar generate -f
+	@cd rel && $(REBAR) generate -f
 
 plugins:
 	@for plugin in ./plugins/* ; do \
+	if [ -d $${plugin} ]; then \
+		echo "copy $${plugin}"; \
 		cp -R $${plugin} $(DIST)/plugins/ && rm -rf $(DIST)/$${plugin}/src/ ; \
+	fi \
 	done
 
 dist: rel plugins
diff --git a/PLUGIN.md b/PLUGIN.md
new file mode 100644
index 000000000..7991de2cd
--- /dev/null
+++ b/PLUGIN.md
@@ -0,0 +1,4 @@
+
+Please see [Plugin Design](https://github.com/emqtt/emqttd/wiki/Plugin%20Design).
+
+
diff --git a/plugins/emqttd_dashboard b/plugins/emqttd_dashboard
new file mode 160000
index 000000000..2d3c9aeab
--- /dev/null
+++ b/plugins/emqttd_dashboard
@@ -0,0 +1 @@
+Subproject commit 2d3c9aeabeb5289b9ae27c503f017ad71bd81174
diff --git a/plugins/emqttd_plugin_mysql b/plugins/emqttd_plugin_mysql
new file mode 160000
index 000000000..892810dbc
--- /dev/null
+++ b/plugins/emqttd_plugin_mysql
@@ -0,0 +1 @@
+Subproject commit 892810dbc853ba147f9acabecd52bb51218275e2
diff --git a/plugins/emysql b/plugins/emysql
new file mode 160000
index 000000000..38927104b
--- /dev/null
+++ b/plugins/emysql
@@ -0,0 +1 @@
+Subproject commit 38927104b44b3f8d237bcf3a2b50f2e0608291b3
diff --git a/rel/files/emqttd b/rel/files/emqttd
index 83b0368d0..8574571c1 100755
--- a/rel/files/emqttd
+++ b/rel/files/emqttd
@@ -141,13 +141,6 @@ case "$1" in
             echo $RES
             exit 1
         fi
-        # Sanity check the plugins.config file
-        RES=`$NODETOOL_LITE chkconfig $RUNNER_ETC_DIR/plugins.config`
-        if [ $? != 0 ]; then
-            echo "Error reading $RUNNER_ETC_DIR/plugins.config"
-            echo $RES
-            exit 1
-        fi
         HEART_COMMAND="$RUNNER_SCRIPT_DIR/$SCRIPT start"
         export HEART_COMMAND
         mkdir -p $PIPE_DIR
@@ -265,13 +258,6 @@ case "$1" in
             echo $RES
             exit 1
         fi
-        # Sanity check the plugins.config file
-        RES=`$NODETOOL_LITE chkconfig $RUNNER_ETC_DIR/plugins.config`
-        if [ $? != 0 ]; then
-            echo "Error reading $RUNNER_ETC_DIR/plugins.config"
-            echo $RES
-            exit 1
-        fi
         # Setup beam-required vars
         ROOTDIR=$RUNNER_BASE_DIR
         ERL_LIBS=$ROOTDIR/plugins
@@ -279,7 +265,7 @@ case "$1" in
         EMU=beam
         PROGNAME=`echo $0 | sed 's/.*\///'`
         CMD="$BINDIR/erlexec -boot $RUNNER_BASE_DIR/releases/$APP_VSN/$SCRIPT \
-            -embedded -config $RUNNER_ETC_DIR/emqttd.config -config $RUNNER_ETC_DIR/plugins.config \
+            -embedded -config $RUNNER_ETC_DIR/emqttd.config \
             -pa $RUNNER_LIB_DIR/basho-patches \
             -args_file $RUNNER_ETC_DIR/vm.args -- ${1+"$@"}"
         export EMU
@@ -305,13 +291,6 @@ case "$1" in
             echo $RES
             exit 1
         fi
-        # Sanity check the plugins.config file
-        RES=`$NODETOOL_LITE chkconfig $RUNNER_ETC_DIR/plugins.config`
-        if [ $? != 0 ]; then
-            echo "Error reading $RUNNER_ETC_DIR/plugins.config"
-            echo $RES
-            exit 1
-        fi
         echo "config is OK"
         ;;
     escript)
diff --git a/rel/files/emqttd.config b/rel/files/emqttd.config
index 7ff3e49ba..f49718ff6 100644
--- a/rel/files/emqttd.config
+++ b/rel/files/emqttd.config
@@ -165,7 +165,7 @@
     %% Plugins
     {plugins, [
         {dir, "./plugins"},
-        {loaded_file, "./data/loaded_plugins"}
+        {loaded_file, "./data/plugins.config"}
     ]},
     %% Listeners
     {listeners, [
diff --git a/rel/files/plugins.config b/rel/files/plugins.config
index 0a5655c66..68ba6a41d 100644
--- a/rel/files/plugins.config
+++ b/rel/files/plugins.config
@@ -1,26 +1 @@
-[
-% {emysql, [
-%    {pool_size, 4},
-%    {host, "localhost"},
-%    {port, 3306},
-%    {username, "root"}, 
-%    {password, "public"},
-%    {database, "mqtt"},
-%    {encoding, utf8}
-% ]},
-% {emqttd_auth_mysql, [
-%     {user_table, mqtt_users},
-%     {password_hash, plain},
-%     {field_mapper, [
-%         {username, username},
-%         {password, password}
-%     ]}
-% ]},
-% {emqttd_dashboard, [
-%    {listener, 
-%        {emqttd_dashboard, 18083, [
-%            {acceptors, 4},
-%            {max_clients, 512}]}}
-% ]}
-%
-].
+emqttd_dashboard.
diff --git a/rel/reltool.config b/rel/reltool.config
index 768b793f0..19c11600a 100644
--- a/rel/reltool.config
+++ b/rel/reltool.config
@@ -87,7 +87,6 @@
            {template, "files/acl.config", "etc/acl.config"},
            {template, "files/rewrite.config", "etc/rewrite.config"},
            {template, "files/clients.config", "etc/clients.config"},
-           {template, "files/plugins.config", "etc/plugins.config"},
            {template, "files/vm.args", "etc/vm.args"},
-           {copy, "files/loaded_plugins", "data/loaded_plugins"}
+           {copy, "files/plugins.config", "data/plugins.config"}
           ]}.
diff --git a/src/emqttd_plugins.erl b/src/emqttd_plugins.erl
index 4372ca3c7..f8bcc7696 100644
--- a/src/emqttd_plugins.erl
+++ b/src/emqttd_plugins.erl
@@ -213,8 +213,9 @@ read_loaded() ->
 write_loaded(AppNames) ->
     case file:open(env(loaded_file), [binary, write]) of
         {ok, Fd} ->
-            Line = list_to_binary(io_lib:format("~w.~n", [AppNames])),
-            file:write(Fd, Line);
+            lists:foreach(fun(Name) ->
+                file:write(Fd, iolist_to_binary(io_lib:format("~s.~n", [Name])))
+            end, AppNames);
         {error, Error} ->
             {error, Error}
     end.
diff --git a/src/emqttd_session_sup.erl b/src/emqttd_session_sup.erl
index ff12b5055..1375c9fda 100644
--- a/src/emqttd_session_sup.erl
+++ b/src/emqttd_session_sup.erl
@@ -57,6 +57,6 @@ start_session(CleanSess, ClientId, ClientPid) ->
 init([]) ->
     {ok, {{simple_one_for_one, 10, 10},
           [{session, {emqttd_session, start_link, []},
-              transient, 10000, worker, [emqttd_session]}]}}.
+              temporary, 10000, worker, [emqttd_session]}]}}.