diff --git a/apps/emqx/mix.exs b/apps/emqx/mix.exs
index 2daf2cfb9..1ff0d23bb 100644
--- a/apps/emqx/mix.exs
+++ b/apps/emqx/mix.exs
@@ -1,5 +1,6 @@
 defmodule EMQX.MixProject do
   use Mix.Project
+  Code.require_file("../../lib/emqx/mix/common.ex")
 
   def project do
     [
@@ -19,6 +20,7 @@ defmodule EMQX.MixProject do
   def application do
     [
       mod: {:emqx_app, []},
+      applications: EMQX.Mix.Common.erl_apps(:emqx),
       extra_applications: [:logger, :os_mon, :syntax_tools]
     ]
   end
@@ -33,7 +35,7 @@ defmodule EMQX.MixProject do
       {:ekka, github: "emqx/ekka", tag: "0.11.1"},
       # {:gen_rpc, github: "emqx/gen_rpc", tag: "2.5.1"},
       # {:cuttlefish, github: "emqx/cuttlefish", tag: "v4.0.1"},
-      {:hocon, github: "emqx/hocon", tag: "0.22.0"},
+      {:hocon, github: "emqx/hocon", tag: "0.22.0", runtime: false},
       # {:pbkdf2, github: "emqx/erlang-pbkdf2", tag: "2.0.4"},
       # {:snabbkaffe, github: "kafka4beam/snabbkaffe", tag: "0.14.0"},
       # {:jiffy, github: "emqx/jiffy", tag: "1.0.5"},
diff --git a/apps/emqx_authz/mix.exs b/apps/emqx_authz/mix.exs
index 075691772..5395eaf8c 100644
--- a/apps/emqx_authz/mix.exs
+++ b/apps/emqx_authz/mix.exs
@@ -1,9 +1,12 @@
 defmodule EMQXAuthz.MixProject do
   use Mix.Project
+  Code.require_file("../../lib/emqx/mix/common.ex")
+
+  @app :emqx_authz
 
   def project do
     [
-      app: :emqx_authz,
+      app: @app,
       version: "0.1.0",
       build_path: "../../_build",
       config_path: "../../config/config.exs",
@@ -17,6 +20,8 @@ defmodule EMQXAuthz.MixProject do
 
   def application do
     [
+      mod: EMQX.Mix.Common.from_erl!(@app, :mod),
+      applications: EMQX.Mix.Common.from_erl!(@app, :applications),
       extra_applications: [:logger]
     ]
   end
diff --git a/apps/emqx_bridge/mix.exs b/apps/emqx_bridge/mix.exs
index f9a94ad47..228fdcfc5 100644
--- a/apps/emqx_bridge/mix.exs
+++ b/apps/emqx_bridge/mix.exs
@@ -1,5 +1,6 @@
 defmodule EMQXBridge.MixProject do
   use Mix.Project
+  Code.require_file("../../lib/emqx/mix/common.ex")
 
   def project do
     [
@@ -20,6 +21,7 @@ defmodule EMQXBridge.MixProject do
     [
       registered: [],
       mod: {:emqx_bridge_app, []},
+      applications: EMQX.Mix.Common.from_erl!(:emqx_bridge, :applications),
       extra_applications: [:logger]
     ]
   end
diff --git a/apps/emqx_conf/mix.exs b/apps/emqx_conf/mix.exs
index ca38717d5..f4bbf0eec 100644
--- a/apps/emqx_conf/mix.exs
+++ b/apps/emqx_conf/mix.exs
@@ -1,5 +1,6 @@
 defmodule EMQXConf.MixProject do
   use Mix.Project
+  Code.require_file("../../lib/emqx/mix/common.ex")
 
   def project do
     [
@@ -19,6 +20,8 @@ defmodule EMQXConf.MixProject do
   def application do
     [
       mod: {:emqx_conf_app, []},
+      # applications: EMQX.Mix.Common.erl_apps(:emqx_conf),
+      # included_applications: [:hocon],
       # extra_applications: [:logger, :os_mon, :syntax_tools]
     ]
   end
@@ -26,7 +29,7 @@ defmodule EMQXConf.MixProject do
   defp deps do
     [
       {:emqx, in_umbrella: true, runtime: false},
-      # {:hocon, github: "emqx/hocon"}
+      {:hocon, github: "emqx/hocon", tag: "0.22.0"},
     ]
   end
 end
diff --git a/apps/emqx_connector/mix.exs b/apps/emqx_connector/mix.exs
index ae6fb0b09..daf7dab84 100644
--- a/apps/emqx_connector/mix.exs
+++ b/apps/emqx_connector/mix.exs
@@ -1,5 +1,6 @@
 defmodule EMQXConnector.MixProject do
   use Mix.Project
+  Code.require_file("../../lib/emqx/mix/common.ex")
 
   def project do
     [
@@ -18,6 +19,7 @@ defmodule EMQXConnector.MixProject do
   def application do
     [
       mod: {:emqx_connector_app, []},
+      applications: EMQX.Mix.Common.from_erl!(:emqx_connector, :applications),
       extra_applications: [:logger]
     ]
   end
@@ -28,6 +30,8 @@ defmodule EMQXConnector.MixProject do
       {:epgsql, github: "epgsql/epgsql", tag: "4.4.0"},
       {:mysql, github: "emqx/mysql-otp", tag: "1.7.1"},
       {:emqtt, github: "emqx/emqtt", tag: "1.4.3"},
+      {:eredis_cluster, github: "emqx/eredis_cluster", tag: "0.6.7"},
+      {:mongodb, github: "emqx/mongodb-erlang", tag: "v3.0.10"},
       # {:ecpool, github: "emqx/ecpool", tag: "0.5.1"},
       # {:emqtt, github: "emqx/emqtt", tag: "1.4.3"}
     ]
diff --git a/apps/emqx_dashboard/mix.exs b/apps/emqx_dashboard/mix.exs
index ff8f1eac6..97b1fb469 100644
--- a/apps/emqx_dashboard/mix.exs
+++ b/apps/emqx_dashboard/mix.exs
@@ -1,5 +1,6 @@
 defmodule EMQXDashboard.MixProject do
   use Mix.Project
+  Code.require_file("../../lib/emqx/mix/common.ex")
 
   def project do
     [
@@ -20,6 +21,7 @@ defmodule EMQXDashboard.MixProject do
     [
       registered: [:emqx_dashboard_sup],
       mod: {:emqx_dashboard_app, []},
+      applications: EMQX.Mix.Common.from_erl!(:emqx_dashboard, :applications),
       extra_applications: [:logger]
     ]
   end
diff --git a/apps/emqx_exhook/mix.exs b/apps/emqx_exhook/mix.exs
index 4a90501b0..e599ddec0 100644
--- a/apps/emqx_exhook/mix.exs
+++ b/apps/emqx_exhook/mix.exs
@@ -28,7 +28,7 @@ defmodule EMQXExhook.MixProject do
 
   defp deps do
     [
-      {:emqx, in_umbrella: true, runtime: false},
+      {:emqx, in_umbrella: true},
       {:grpc, github: "emqx/grpc-erl", tag: "0.6.2"},
     ]
   end
diff --git a/apps/emqx_gateway/mix.exs b/apps/emqx_gateway/mix.exs
index 32c3b856c..76f45b5cf 100644
--- a/apps/emqx_gateway/mix.exs
+++ b/apps/emqx_gateway/mix.exs
@@ -1,5 +1,6 @@
 defmodule EMQXGateway.MixProject do
   use Mix.Project
+  Code.require_file("../../lib/emqx/mix/common.ex")
 
   def project do
     [
@@ -22,6 +23,7 @@ defmodule EMQXGateway.MixProject do
     [
       registered: [],
       mod: {:emqx_gateway_app, []},
+      applications: EMQX.Mix.Common.from_erl!(:emqx_gateway, :applications),
       extra_applications: [:logger]
     ]
   end
diff --git a/apps/emqx_machine/src/emqx_machine_boot.erl b/apps/emqx_machine/src/emqx_machine_boot.erl
index d1347693f..bef68a319 100644
--- a/apps/emqx_machine/src/emqx_machine_boot.erl
+++ b/apps/emqx_machine/src/emqx_machine_boot.erl
@@ -110,14 +110,37 @@ reboot_apps() ->
 
 sorted_reboot_apps() ->
     Apps = [{App, app_deps(App)} || App <- reboot_apps()],
+    ?SLOG(warning, #{ msg => "sorted_reboot_apps/0 before /1"
+                    , apps => Apps
+                    }),
     Res = sorted_reboot_apps(Apps),
     io:format(user, "~n>>>>>>>>>>>>>> sorted_reboot_apps~n ~100p~n", [Res]),
-    Res.
+    Res,
+    %% FIXME!!!!!  For some reason, emqx_conf appears in the
+    %% `applications` key in resource, but it is not there in the
+    %% .app.src...
+    Res0 = [emqx_conf,gproc,esockd,ranch,cowboy,emqx,emqx_prometheus,emqx_modules,emqx_dashboard,
+     emqx_gateway,emqx_management,emqx_retainer,emqx_statsd,emqx_resource,emqx_connector,emqx_bridge,
+     emqx_authn,emqx_authz,emqx_exhook],
+    case true of
+        true ->
+            Res;
+        false ->
+            Res0
+    end.
 
 app_deps(App) ->
     case application:get_key(App, applications) of
         undefined -> [];
-        {ok, List} -> lists:filter(fun(A) -> lists:member(A, reboot_apps()) end, List)
+        {ok, List} ->
+            ?SLOG(warning, #{ msg => ">>>>>> machine_boot:add_deps"
+                            , app => App
+                            , apps => List
+                            , included => application:get_key(App, included_applications)
+                            }),
+            lists:filter(fun(A) ->
+                                 lists:member(A, reboot_apps())
+                         end, List)
     end.
 
 sorted_reboot_apps(Apps) ->
diff --git a/apps/emqx_management/mix.exs b/apps/emqx_management/mix.exs
index b9f8ec078..0838bf49a 100644
--- a/apps/emqx_management/mix.exs
+++ b/apps/emqx_management/mix.exs
@@ -1,5 +1,6 @@
 defmodule EMQXManagement.MixProject do
   use Mix.Project
+  Code.require_file("../../lib/emqx/mix/common.ex")
 
   def project do
     [
@@ -20,6 +21,7 @@ defmodule EMQXManagement.MixProject do
     [
       registered: [:emqx_management_sup],
       mod: {:emqx_mgmt_app, []},
+      applications: EMQX.Mix.Common.from_erl!(:emqx_management, :applications),
       extra_applications: [:logger, :syntax_tools]
     ]
   end
diff --git a/apps/emqx_modules/mix.exs b/apps/emqx_modules/mix.exs
index a842654d3..b931a823c 100644
--- a/apps/emqx_modules/mix.exs
+++ b/apps/emqx_modules/mix.exs
@@ -1,5 +1,6 @@
 defmodule EMQXModules.MixProject do
   use Mix.Project
+  Code.require_file("../../lib/emqx/mix/common.ex")
 
   def project do
     [
@@ -19,6 +20,7 @@ defmodule EMQXModules.MixProject do
     [
       registered: [:emqx_mod_sup],
       mod: {:emqx_modules_app, []},
+      applications: EMQX.Mix.Common.from_erl!(:emqx_modules, :applications),
       extra_applications: [:logger]
     ]
   end
diff --git a/apps/emqx_prometheus/mix.exs b/apps/emqx_prometheus/mix.exs
index caac0c13a..2e3a6b4e7 100644
--- a/apps/emqx_prometheus/mix.exs
+++ b/apps/emqx_prometheus/mix.exs
@@ -10,7 +10,7 @@ defmodule EMQXPrometheus.MixProject do
       deps_path: "../../deps",
       lockfile: "../../mix.lock",
       elixir: "~> 1.12",
-      start_permanent: Mix.env() == :prod,
+      # start_permanent: Mix.env() == :prod,
       deps: deps(),
       description: "Prometheus for EMQ X"
     ]
@@ -26,7 +26,7 @@ defmodule EMQXPrometheus.MixProject do
 
   defp deps do
     [
-      {:emqx, in_umbrella: true, runtime: false},
+      {:emqx, in_umbrella: true},
       {:prometheus, github: "emqx/prometheus.erl", tag: "v3.1.1"}
     ]
   end
diff --git a/apps/emqx_resource/mix.exs b/apps/emqx_resource/mix.exs
index 1b35204ad..fe3edbaa0 100644
--- a/apps/emqx_resource/mix.exs
+++ b/apps/emqx_resource/mix.exs
@@ -1,5 +1,6 @@
 defmodule EMQXResource.MixProject do
   use Mix.Project
+  Code.require_file("../../lib/emqx/mix/common.ex")
 
   def project do
     [
@@ -11,7 +12,7 @@ defmodule EMQXResource.MixProject do
       lockfile: "../../mix.lock",
       elixir: "~> 1.12",
       # start_permanent: Mix.env() == :prod,
-      start_permanent: false,
+      # start_permanent: false,
       deps: deps()
     ]
   end
@@ -19,7 +20,8 @@ defmodule EMQXResource.MixProject do
   def application do
     [
       mod: {:emqx_resource_app, []},
-      extra_applications: [:logger, :syntax_tools]
+      applications: EMQX.Mix.Common.erl_apps(:emqx_resource),
+      # extra_applications: [:emqx, :emqx_conf],
     ]
   end
 
@@ -28,7 +30,8 @@ defmodule EMQXResource.MixProject do
       # {:jsx, "3.1.0"},
       # {:gproc, "0.9.0"},
       {:hocon, github: "emqx/hocon", tag: "0.22.0", runtime: false},
-      {:emqx, in_umbrella: true, runtime: false}
+      {:emqx, in_umbrella: true},
+      {:emqx_conf, in_umbrella: true},
     ]
   end
 end
diff --git a/apps/emqx_resource/src/emqx_resource.app.src b/apps/emqx_resource/src/emqx_resource.app.src
index 1b93aa0de..65e2a433c 100644
--- a/apps/emqx_resource/src/emqx_resource.app.src
+++ b/apps/emqx_resource/src/emqx_resource.app.src
@@ -8,9 +8,10 @@
    [kernel,
     stdlib,
     gproc,
-    hocon,
+    %% hocon,
     jsx,
-    emqx
+    emqx,
+    emqx_conf
    ]},
   {env,[]},
   {modules, []},
diff --git a/apps/emqx_retainer/mix.exs b/apps/emqx_retainer/mix.exs
index 730079ad4..7fd1b7077 100644
--- a/apps/emqx_retainer/mix.exs
+++ b/apps/emqx_retainer/mix.exs
@@ -1,5 +1,6 @@
 defmodule EMQXRetainer.MixProject do
   use Mix.Project
+  Code.require_file("../../lib/emqx/mix/common.ex")
 
   def project do
     [
@@ -10,23 +11,24 @@ defmodule EMQXRetainer.MixProject do
       deps_path: "../../deps",
       lockfile: "../../mix.lock",
       elixir: "~> 1.12",
-      start_permanent: Mix.env() == :prod,
+      # start_permanent: Mix.env() == :prod,
       deps: deps(),
       description: "EMQ X Retainer"
     ]
   end
 
-  # def application do
-  #   [
-  #     registered: [:emqx_retainer_sup],
-  #     mod: {:emqx_retainer_app, []},
-  #     # extra_applications: [:logger]
-  #   ]
-  # end
+  def application do
+    [
+      registered: [:emqx_retainer_sup],
+      mod: {:emqx_retainer_app, []},
+      applications: EMQX.Mix.Common.erl_apps(:emqx_retainer),
+      # extra_applications: [:emqx],
+    ]
+  end
 
   defp deps do
     [
-      {:emqx, in_umbrella: true, runtime: false}
+      {:emqx, in_umbrella: true}
     ]
   end
 end
diff --git a/apps/emqx_statsd/mix.exs b/apps/emqx_statsd/mix.exs
index 6823daefe..a2bd0ec64 100644
--- a/apps/emqx_statsd/mix.exs
+++ b/apps/emqx_statsd/mix.exs
@@ -1,5 +1,6 @@
 defmodule EMQXStatsd.MixProject do
   use Mix.Project
+  Code.require_file("../../lib/emqx/mix/common.ex")
 
   def project do
     [
@@ -19,6 +20,7 @@ defmodule EMQXStatsd.MixProject do
   def application do
     [
       mod: {:emqx_statsd_app, []},
+      applications: EMQX.Mix.Common.from_erl!(:emqx_statsd, :applications),
       extra_applications: [:logger]
     ]
   end
diff --git a/lib/emqx/mix/common.ex b/lib/emqx/mix/common.ex
new file mode 100644
index 000000000..41b5da4dc
--- /dev/null
+++ b/lib/emqx/mix/common.ex
@@ -0,0 +1,11 @@
+defmodule EMQX.Mix.Common do
+  def erl_apps(app) do
+    from_erl!(app, :applications)
+  end
+
+  def from_erl!(app, key) do
+    path = Path.join("src", "#{app}.app.src")
+    {:ok, [{:application, ^app, props}]} = :file.consult(path)
+    Keyword.fetch!(props, key)
+  end
+end
diff --git a/lib/emqx/mix/helpers.exs b/lib/emqx/mix/helpers.exs
new file mode 100644
index 000000000..b1742a4a8
--- /dev/null
+++ b/lib/emqx/mix/helpers.exs
@@ -0,0 +1,24 @@
+defmodule EMQX.Mix.Helpers do
+  def read_rebar_config!(filepath) do
+    {:ok, config} = read_rebar_config(filepath)
+    config
+  end
+
+  def read_rebar_config(filepath) do
+    filepath
+    |> to_charlist()
+    |> :file.consult()
+  end
+
+  def rebar_to_mix_dep({name, {:git, url, {:tag, tag}}}),
+    do: {name, git: to_string(url), tag: to_string(tag)}
+
+  def rebar_to_mix_dep({name, {:git, url, {:ref, ref}}}),
+    do: {name, git: to_string(url), ref: to_string(ref)}
+
+  def rebar_to_mix_dep({name, {:git, url, {:branch, branch}}}),
+    do: {name, git: to_string(url), branch: to_string(branch)}
+
+  def rebar_to_mix_dep({name, vsn}) when is_list(vsn),
+    do: {name, to_string(vsn)}
+end
diff --git a/lib/mix/tasks/compile/render_config.exs b/lib/mix/tasks/compile/render_config.exs
new file mode 100644
index 000000000..a7d18e016
--- /dev/null
+++ b/lib/mix/tasks/compile/render_config.exs
@@ -0,0 +1,9 @@
+defmodule Mix.Tasks.Compile.RenderConfig do
+  use Mix.Task.Compiler
+
+  def run(_args) do
+    cmd = "./rebar3"
+    args = ["deps"]
+    System.cmd(cmd, args, env: [{"DEBUG", "1"}], into: IO.stream(:stdio, :line))
+  end
+end
diff --git a/mix.exs b/mix.exs
index 06b9eed1a..083e22c50 100644
--- a/mix.exs
+++ b/mix.exs
@@ -1,6 +1,8 @@
 defmodule EMQXUmbrella.MixProject do
   use Mix.Project
 
+  Code.load_file("./mix_release.exs")
+
   def project do
     [
       apps_path: "apps",
@@ -107,6 +109,7 @@ defmodule EMQXUmbrella.MixProject do
           compiler: :permanent,
           runtime_tools: :permanent,
           # emqx_conf: :permanent,
+          # hocon: :load,
           emqx: :load,
           emqx_conf: :load, # as per rebar.config.erl
           emqx_machine: :permanent,
@@ -119,7 +122,7 @@ defmodule EMQXUmbrella.MixProject do
           emqx_connector: :permanent,
           emqx_authn: :permanent,
           emqx_authz: :permanent,
-          # emqx_auto_subscribe: :permanent,
+          emqx_auto_subscribe: :permanent,
           emqx_gateway: :permanent,
           emqx_exhook: :permanent,
           emqx_bridge: :permanent,
@@ -128,13 +131,13 @@ defmodule EMQXUmbrella.MixProject do
           emqx_management: :permanent,
           emqx_dashboard: :permanent,
           emqx_statsd: :permanent,
-          # emqx_retainer: :permanent,
-          emqx_retainer: :none,
+          emqx_retainer: :permanent,
+          # emqx_retainer: :none,
           emqx_prometheus: :permanent,
-          # emqx_psk: :permanent,
-          emqx_psk: :none,
-          # emqx_limiter: :permanent,
-          emqx_limiter: :none,
+          emqx_psk: :permanent,
+          # emqx_psk: :none,
+          emqx_limiter: :permanent,
+          # emqx_limiter: :none,
           observer: :load,
           # emqx_mix: :none,
         ],
diff --git a/mix.lock b/mix.lock
index 916c6f6ed..7c03e7dc3 100644
--- a/mix.lock
+++ b/mix.lock
@@ -5,6 +5,8 @@
   "cowboy_swagger": {:git, "https://github.com/inaka/cowboy_swagger", "bc441df7988da0f5c5d11ae0861c394dc30995c5", [tag: "2.5.0"]},
   "cowlib": {:hex, :cowlib, "2.11.0", "0b9ff9c346629256c42ebe1eeb769a83c6cb771a6ee5960bd110ab0b9b872063", [:make, :rebar3], [], "hexpm", "2b3e9da0b21c4565751a6d4901c20d1b4cc25cbb7fd50d91d2ab6dd287bc86a9"},
   "cuttlefish": {:git, "https://github.com/emqx/cuttlefish.git", "6c346563e89ebbd95dbc1c29017adaf9abf85ca1", []},
+  "earmark": {:hex, :earmark, "1.4.19", "3854a17305c880cc46305af15fb1630568d23a709aba21aaa996ced082fc29d7", [:mix], [{:earmark_parser, ">= 1.4.18", [hex: :earmark_parser, repo: "hexpm", optional: false]}], "hexpm", "d5a8c9f9e37159a8fdd3ea8437fb4e229eaf56d5129b9a011dc4780a4872079d"},
+  "earmark_parser": {:hex, :earmark_parser, "1.4.18", "e1b2be73eb08a49fb032a0208bf647380682374a725dfb5b9e510def8397f6f2", [:mix], [], "hexpm", "114a0e85ec3cf9e04b811009e73c206394ffecfcc313e0b346de0d557774ee97"},
   "ecpool": {:git, "https://github.com/emqx/ecpool.git", "0516d2cebd14654ef8c583c347e4a0b01363b86d", [tag: "0.5.1"]},
   "eetcd": {:hex, :eetcd, "0.3.4", "27e8b4775230c53a9ef602f62a1603591302b40b2eb195d567edffb35b6cf1a2", [:rebar3], [{:gun, "1.3.3", [hex: :gun, repo: "hexpm", optional: false]}], "hexpm", "b763c0e1a9741d39a62f5a19186a342863eacbc769151c4e81db5790efecefca"},
   "ehttpc": {:git, "https://github.com/emqx/ehttpc.git", "7b1a76b2353b385725e62f948cd399c7040467f8", [tag: "0.1.12"]},
@@ -13,11 +15,12 @@
   "emqtt": {:git, "https://github.com/emqx/emqtt.git", "25892ef48a979a9dfbd74d86133cb28cf11f3cf4", [tag: "1.4.3"]},
   "emqx_http_lib": {:git, "https://github.com/emqx/emqx_http_lib.git", "9a1aafcbad1bb35392ebabc0cf102c7bce660432", [tag: "0.4.0"]},
   "epgsql": {:git, "https://github.com/epgsql/epgsql.git", "895c8f9d53f08d09ec6a0301c56d3d6f270929f2", [tag: "4.4.0"]},
-  "eredis": {:git, "https://github.com/emqx/eredis", "75f2b8eedbe631136326680225efbcd2684e93e7", [tag: "1.2.5"]},
-  "eredis_cluster": {:git, "https://github.com/emqx/eredis_cluster", "624749b4aef25668e9c7a545427fdc663a04faef", [tag: "0.6.7"]},
+  "eredis": {:hex, :eredis, "1.2.0", "0b8e9cfc2c00fa1374cd107ea63b49be08d933df2cf175e6a89b73dd9c380de4", [:rebar3], [], "hexpm", "d9b5abef2c2c8aba8f32aa018203e0b3dc8b1157773b254ab1d4c2002317f1e1"},
+  "eredis_cluster": {:git, "https://github.com/emqx/eredis_cluster.git", "624749b4aef25668e9c7a545427fdc663a04faef", [tag: "0.6.7"]},
   "esasl": {:git, "https://github.com/emqx/esasl.git", "96d7ac9f6c156017dd35b30df2dd722ae469c7f0", [tag: "0.2.0"]},
   "esockd": {:git, "https://github.com/emqx/esockd.git", "9b959fc11a1c398a589892f335235be6c5b4a454", [tag: "5.8.0"]},
   "estatsd": {:git, "https://github.com/emqx/estatsd.git", "5184d846b7ecb83509bd4d32695c60428c0198cd", [tag: "0.1.0"]},
+  "ex_doc": {:hex, :ex_doc, "0.19.3", "3c7b0f02851f5fc13b040e8e925051452e41248f685e40250d7e40b07b9f8c10", [:mix], [{:earmark, "~> 1.2", [hex: :earmark, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.10", [hex: :makeup_elixir, repo: "hexpm", optional: false]}], "hexpm", "0e11d67e662142fc3945b0ee410c73c8c956717fbeae4ad954b418747c734973"},
   "gen_coap": {:git, "https://github.com/emqx/gen_coap.git", "9bf5e7f795badf68e2fb4eb226f576308f5b1bb4", [tag: "v0.3.2"]},
   "gen_rpc": {:git, "https://github.com/emqx/gen_rpc.git", "fb7418dc8cf7e97d153fba073bee0fac07dce753", [tag: "2.5.1"]},
   "getopt": {:git, "https://github.com/emqx/getopt.git", "215f2083408e1fe562d441aea6062bf5d9e1fb67", [tag: "v1.0.2"]},
@@ -30,11 +33,14 @@
   "jose": {:hex, :jose, "1.11.2", "f4c018ccf4fdce22c71e44d471f15f723cb3efab5d909ab2ba202b5bf35557b3", [:mix, :rebar3], [], "hexpm", "98143fbc48d55f3a18daba82d34fe48959d44538e9697c08f34200fa5f0947d2"},
   "jsx": {:hex, :jsx, "3.1.0", "d12516baa0bb23a59bb35dccaf02a1bd08243fcbb9efe24f2d9d056ccff71268", [:rebar3], [], "hexpm", "0c5cc8fdc11b53cc25cf65ac6705ad39e54ecc56d1c22e4adb8f5a53fb9427f3"},
   "lc": {:git, "https://github.com/qzhuyan/lc.git", "6f98d098e5aaf4fcd6afbbb2acca96855c474600", [tag: "0.1.2"]},
+  "makeup": {:hex, :makeup, "1.0.5", "d5a830bc42c9800ce07dd97fa94669dfb93d3bf5fcf6ea7a0c67b2e0e4a7f26c", [:mix], [{:nimble_parsec, "~> 0.5 or ~> 1.0", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "cfa158c02d3f5c0c665d0af11512fed3fba0144cf1aadee0f2ce17747fba2ca9"},
+  "makeup_elixir": {:hex, :makeup_elixir, "0.15.2", "dc72dfe17eb240552857465cc00cce390960d9a0c055c4ccd38b70629227e97c", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.1", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "fd23ae48d09b32eff49d4ced2b43c9f086d402ee4fd4fcb2d7fad97fa8823e75"},
   "minirest": {:git, "https://github.com/emqx/minirest.git", "f3f80b3e07295d8b6db22ed456318e0cc9dd167f", [tag: "1.2.7"]},
   "mnesia_rocksdb": {:git, "https://github.com/k32/mnesia_rocksdb", "42715650a3b84fe13d23a1e7f65815ff36386b0f", [tag: "0.1.3-k32"]},
-  "mongodb": {:git, "https://github.com/emqx/mongodb-erlang", "2ffe62f42dafb98eaafead9d340a674c5f9279a5", [tag: "v3.0.10"]},
+  "mongodb": {:git, "https://github.com/emqx/mongodb-erlang.git", "2ffe62f42dafb98eaafead9d340a674c5f9279a5", [tag: "v3.0.10"]},
   "mria": {:git, "https://github.com/emqx/mria.git", "0887b3fa2b3576175ac38d32e35177635f01621a", [tag: "0.1.4"]},
   "mysql": {:git, "https://github.com/emqx/mysql-otp.git", "bdabac44cc8836a9e23897b7e1b77c7df7e04f70", [tag: "1.7.1"]},
+  "nimble_parsec": {:hex, :nimble_parsec, "1.2.0", "b44d75e2a6542dcb6acf5d71c32c74ca88960421b6874777f79153bbbbd7dccc", [:mix], [], "hexpm", "52b2871a7515a5ac49b00f214e4165a40724cf99798d8e4a65e4fd64ebd002c1"},
   "pbkdf2": {:git, "https://github.com/emqx/erlang-pbkdf2.git", "45d9981209ea07a83a58cf85aaf8236457da4342", [tag: "2.0.4"]},
   "poolboy": {:git, "https://github.com/emqx/poolboy.git", "29be47db8c2be38b18c908e43a80ebb7b9b6116b", [tag: "1.5.2"]},
   "prometheus": {:git, "https://github.com/emqx/prometheus.erl.git", "a41488df09472448057d264ef520cf2f71d925f8", [tag: "v3.1.1"]},
diff --git a/mix_release.exs b/mix_release.exs
new file mode 100644
index 000000000..9a92a408e
--- /dev/null
+++ b/mix_release.exs
@@ -0,0 +1,874 @@
+defmodule Mix.Release do
+  IO.puts(
+    IO.ANSI.red()
+    <> "I live!!"
+    <> IO.ANSI.reset()
+  )
+
+  @moduledoc """
+  Defines the release structure and convenience for assembling releases.
+  """
+
+  @doc """
+  The Mix.Release struct has the following read-only fields:
+
+    * `:name` - the name of the release as an atom
+    * `:version` - the version of the release as a string or
+       `{:from_app, app_name}`
+    * `:path` - the path to the release root
+    * `:version_path` - the path to the release version inside the release
+    * `:applications` - a map of application with their definitions
+    * `:erts_source` - the ERTS source as a charlist (or nil)
+    * `:erts_version` - the ERTS version as a charlist
+
+  The following fields may be modified as long as they keep their defined types:
+
+    * `:boot_scripts` - a map of boot scripts with the boot script name
+      as key and a keyword list with **all** applications that are part of
+      it and their modes as value
+    * `:config_providers` - a list of `{config_provider, term}` tuples where the
+      first element is a module that implements the `Config.Provider` behaviour
+      and `term` is the value given to it on `c:Config.Provider.init/1`
+    * `:options` - a keyword list with all other user supplied release options
+    * `:overlays` - a list of extra files added to the release. If you have a custom
+      step adding extra files to a release, you can add these files to the `:overlays`
+      field so they are also considered on further commands, such as tar/zip. Each entry
+      in overlays is the relative path to the release root of each file
+    * `:steps` - a list of functions that receive the release and returns a release.
+      Must also contain the atom `:assemble` which is the internal assembling step.
+      May also contain the atom `:tar` to create a tarball of the release.
+
+  """
+  defstruct [
+    :name,
+    :version,
+    :path,
+    :version_path,
+    :applications,
+    :boot_scripts,
+    :erts_source,
+    :erts_version,
+    :config_providers,
+    :options,
+    :overlays,
+    :steps
+  ]
+
+  @type mode :: :permanent | :transient | :temporary | :load | :none
+  @type application :: atom()
+  @type t :: %__MODULE__{
+          name: atom(),
+          version: String.t(),
+          path: String.t(),
+          version_path: String.t() | {:from_app, application()},
+          applications: %{application() => keyword()},
+          boot_scripts: %{atom() => [{application(), mode()}]},
+          erts_version: charlist(),
+          erts_source: charlist() | nil,
+          config_providers: [{module, term}],
+          options: keyword(),
+          overlays: list(String.t()),
+          steps: [(t -> t) | :assemble, ...]
+        }
+
+  @default_apps [kernel: :permanent, stdlib: :permanent, elixir: :permanent, sasl: :permanent]
+  @safe_modes [:permanent, :temporary, :transient]
+  @unsafe_modes [:load, :none]
+  @significant_chunks ~w(Atom AtU8 Attr Code StrT ImpT ExpT FunT LitT Line)c
+  @copy_app_dirs ["priv"]
+
+  @doc false
+  @spec from_config!(atom, keyword, keyword) :: t
+  def from_config!(name, config, overrides) do
+    {name, apps, opts} = find_release(name, config)
+
+    unless Atom.to_string(name) =~ ~r/^[a-z][a-z0-9_]*$/ do
+      Mix.raise(
+        "Invalid release name. A release name must start with a lowercase ASCII letter, " <>
+          "followed by lowercase ASCII letters, numbers, or underscores, got: #{inspect(name)}"
+      )
+    end
+
+    opts =
+      [overwrite: false, quiet: false, strip_beams: true]
+      |> Keyword.merge(opts)
+      |> Keyword.merge(overrides)
+
+    {include_erts, opts} = Keyword.pop(opts, :include_erts, true)
+    {erts_source, erts_lib_dir, erts_version} = erts_data(include_erts)
+
+    deps_apps = Mix.Project.deps_apps()
+    loaded_apps = apps |> Keyword.keys() |> load_apps(deps_apps, %{}, erts_lib_dir, [], :root)
+
+    # Make sure IEx is either an active part of the release or add it as none.
+    {loaded_apps, apps} =
+      if Map.has_key?(loaded_apps, :iex) do
+        {loaded_apps, apps}
+      else
+        {load_apps([:iex], deps_apps, loaded_apps, erts_lib_dir, [], :root), apps ++ [iex: :none]}
+      end
+
+    start_boot = build_start_boot(loaded_apps, apps)
+    start_clean_boot = build_start_clean_boot(start_boot)
+
+    {path, opts} =
+      Keyword.pop_lazy(opts, :path, fn ->
+        Path.join([Mix.Project.build_path(config), "rel", Atom.to_string(name)])
+      end)
+
+    path = Path.absname(path)
+
+    {version, opts} =
+      Keyword.pop_lazy(opts, :version, fn ->
+        config[:version] ||
+          Mix.raise(
+            "No :version found. Please make sure a :version is set in your project definition " <>
+              "or inside the release the configuration"
+          )
+      end)
+
+    version =
+      case version do
+        {:from_app, app} ->
+          Application.load(app)
+          version = Application.spec(app, :vsn)
+
+          if !version do
+            Mix.raise(
+              "Could not find version for #{inspect(app)}, please make sure the application exists"
+            )
+          end
+
+          to_string(version)
+
+        "" ->
+          Mix.raise("The release :version cannot be an empty string")
+
+        _ ->
+          version
+      end
+
+    {config_providers, opts} = Keyword.pop(opts, :config_providers, [])
+    {steps, opts} = Keyword.pop(opts, :steps, [:assemble])
+    validate_steps!(steps)
+
+    %Mix.Release{
+      name: name,
+      version: version,
+      path: path,
+      version_path: Path.join([path, "releases", version]),
+      erts_source: erts_source,
+      erts_version: erts_version,
+      applications: loaded_apps,
+      boot_scripts: %{start: start_boot, start_clean: start_clean_boot},
+      config_providers: config_providers,
+      options: opts,
+      overlays: [],
+      steps: steps
+    }
+  end
+
+  defp find_release(name, config) do
+    {name, opts_fun_or_list} = lookup_release(name, config) || infer_release(config)
+    opts = if is_function(opts_fun_or_list, 0), do: opts_fun_or_list.(), else: opts_fun_or_list
+    {apps, opts} = Keyword.pop(opts, :applications, [])
+
+    if apps == [] and Mix.Project.umbrella?(config) do
+      bad_umbrella!()
+    end
+
+    app = Keyword.get(config, :app)
+    apps = Keyword.merge(@default_apps, apps)
+
+    if is_nil(app) or Keyword.has_key?(apps, app) do
+      {name, apps, opts}
+    else
+      {name, apps ++ [{app, :permanent}], opts}
+    end
+  end
+
+  defp lookup_release(nil, config) do
+    case Keyword.get(config, :releases, []) do
+      [] ->
+        nil
+
+      [{name, opts}] ->
+        {name, opts}
+
+      [_ | _] ->
+        case Keyword.get(config, :default_release) do
+          nil ->
+            Mix.raise(
+              "\"mix release\" was invoked without a name but there are multiple releases. " <>
+                "Please call \"mix release NAME\" or set :default_release in your project configuration"
+            )
+
+          name ->
+            lookup_release(name, config)
+        end
+    end
+  end
+
+  defp lookup_release(name, config) do
+    if opts = config[:releases][name] do
+      {name, opts}
+    else
+      found = Keyword.get(config, :releases, [])
+
+      Mix.raise(
+        "Unknown release #{inspect(name)}. " <>
+          "The available releases are: #{inspect(Keyword.keys(found))}"
+      )
+    end
+  end
+
+  defp infer_release(config) do
+    if Mix.Project.umbrella?(config) do
+      bad_umbrella!()
+    else
+      {Keyword.fetch!(config, :app), []}
+    end
+  end
+
+  defp bad_umbrella! do
+    Mix.raise("""
+    Umbrella projects require releases to be explicitly defined with \
+    a non-empty applications key that chooses which umbrella children \
+    should be part of the releases:
+
+        releases: [
+          foo: [
+            applications: [child_app_foo: :permanent]
+          ],
+          bar: [
+            applications: [child_app_bar: :permanent]
+          ]
+        ]
+
+    Alternatively you can perform the release from the children applications
+    """)
+  end
+
+  defp erts_data(erts_data) when is_function(erts_data) do
+    erts_data(erts_data.())
+  end
+
+  defp erts_data(false) do
+    {nil, :code.lib_dir(), :erlang.system_info(:version)}
+  end
+
+  defp erts_data(true) do
+    version = :erlang.system_info(:version)
+    {:filename.join(:code.root_dir(), 'erts-#{version}'), :code.lib_dir(), version}
+  end
+
+  defp erts_data(erts_source) when is_binary(erts_source) do
+    if File.exists?(erts_source) do
+      [_, erts_version] = erts_source |> Path.basename() |> String.split("-")
+      erts_lib_dir = erts_source |> Path.dirname() |> Path.join("lib") |> to_charlist()
+      {to_charlist(erts_source), erts_lib_dir, to_charlist(erts_version)}
+    else
+      Mix.raise("Could not find ERTS system at #{inspect(erts_source)}")
+    end
+  end
+
+  defp load_apps(apps, deps_apps, seen, otp_root, optional, type) do
+    for app <- apps, reduce: seen do
+      seen ->
+        # IO.inspect(app, label: ">>>>>> load_apps app")
+        if reentrant_seen = reentrant(seen, app, type) do
+          reentrant_seen
+        else
+          load_app(app, deps_apps, seen, otp_root, optional, type)
+        end
+    end
+  end
+
+  defp reentrant(seen, app, type) do
+    properties = seen[app]
+
+    cond do
+      is_nil(properties) ->
+        nil
+
+      type != :root and properties[:type] != type ->
+        if properties[:type] == :root do
+          put_in(seen[app][:type], type)
+        else
+          Mix.raise(
+            "#{inspect(app)} is listed both as a regular application and as an included application"
+          )
+        end
+
+      true ->
+        seen
+    end
+  end
+
+  defp load_app(app, deps_apps, seen, otp_root, optional, type) do
+    cond do
+      path = app not in deps_apps && otp_path(otp_root, app) ->
+        do_load_app(app, path, deps_apps, seen, otp_root, true, type)
+
+      path = code_path(app) ->
+        do_load_app(app, path, deps_apps, seen, otp_root, false, type)
+
+      app in optional ->
+        seen
+
+      true ->
+        Mix.raise("Could not find application #{inspect(app)}")
+    end
+  end
+
+  defp otp_path(otp_root, app) do
+    path = Path.join(otp_root, "#{app}-*")
+
+    case Path.wildcard(path) do
+      [] -> nil
+      paths -> paths |> Enum.sort() |> List.last() |> to_charlist()
+    end
+  end
+
+  defp code_path(app) do
+    case :code.lib_dir(app) do
+      {:error, :bad_name} -> nil
+      path -> path
+    end
+  end
+
+  defp do_load_app(app, path, deps_apps, seen, otp_root, otp_app?, type) do
+    case :file.consult(Path.join(path, "ebin/#{app}.app")) do
+      {:ok, terms} ->
+        [{:application, ^app, properties}] = terms
+        value = [path: path, otp_app?: otp_app?, type: type] ++ properties
+        seen = Map.put(seen, app, value)
+        applications = Keyword.get(properties, :applications, [])
+        optional = Keyword.get(properties, :optional_applications, [])
+        seen = load_apps(applications, deps_apps, seen, otp_root, optional, :depended)
+        included_applications = Keyword.get(properties, :included_applications, [])
+        load_apps(included_applications, deps_apps, seen, otp_root, [], :included)
+
+      {:error, reason} ->
+        Mix.raise("Could not load #{app}.app. Reason: #{inspect(reason)}")
+    end
+  end
+
+  defp build_start_boot(all_apps, specified_apps) do
+    specified_apps ++
+      Enum.sort(
+        for(
+          {app, props} <- all_apps,
+          not List.keymember?(specified_apps, app, 0),
+          do: {app, default_mode(props)}
+        )
+      )
+  end
+
+  defp default_mode(props) do
+    if props[:type] == :included, do: :load, else: :permanent
+  end
+
+  defp build_start_clean_boot(boot) do
+    for({app, _mode} <- boot, do: {app, :none})
+    |> Keyword.put(:stdlib, :permanent)
+    |> Keyword.put(:kernel, :permanent)
+  end
+
+  defp validate_steps!(steps) do
+    valid_atoms = [:assemble, :tar]
+
+    if not is_list(steps) or Enum.any?(steps, &(&1 not in valid_atoms and not is_function(&1, 1))) do
+      Mix.raise("""
+      The :steps option must be a list of:
+
+        * anonymous function that receives one argument
+        * the atom :assemble or :tar
+
+      Got: #{inspect(steps)}
+      """)
+    end
+
+    if Enum.count(steps, &(&1 == :assemble)) != 1 do
+      Mix.raise("The :steps option must contain the atom :assemble once, got: #{inspect(steps)}")
+    end
+
+    if :assemble in Enum.drop_while(steps, &(&1 != :tar)) do
+      Mix.raise("The :tar step must come after :assemble")
+    end
+
+    if Enum.count(steps, &(&1 == :tar)) > 1 do
+      Mix.raise("The :steps option can only contain the atom :tar once")
+    end
+
+    :ok
+  end
+
+  @doc """
+  Makes the `sys.config` structure.
+
+  If there are config providers, then a value is injected into
+  the `:elixir` application configuration in `sys_config` to be
+  read during boot and trigger the providers.
+
+  It uses the following release options to customize its behaviour:
+
+    * `:reboot_system_after_config`
+    * `:start_distribution_during_config`
+    * `:prune_runtime_sys_config_after_boot`
+
+  In case there are no config providers, it doesn't change `sys_config`.
+  """
+  @spec make_sys_config(t, keyword(), Config.Provider.config_path()) ::
+          :ok | {:error, String.t()}
+  def make_sys_config(release, sys_config, config_provider_path) do
+    {sys_config, runtime_config?} =
+      merge_provider_config(release, sys_config, config_provider_path)
+
+    path = Path.join(release.version_path, "sys.config")
+
+    args = [runtime_config?, sys_config]
+    format = "%% coding: utf-8~n%% RUNTIME_CONFIG=~s~n~tw.~n"
+    File.mkdir_p!(Path.dirname(path))
+    File.write!(path, IO.chardata_to_string(:io_lib.format(format, args)))
+
+    case :file.consult(path) do
+      {:ok, _} ->
+        :ok
+
+      {:error, reason} ->
+        invalid =
+          for {app, kv} <- sys_config,
+              {key, value} <- kv,
+              not valid_config?(value),
+              do: """
+
+              Application: #{inspect(app)}
+              Key: #{inspect(key)}
+              Value: #{inspect(value)}
+              """
+
+        message =
+          case invalid do
+            [] ->
+              "Could not read configuration file. Reason: #{inspect(reason)}"
+
+            _ ->
+              "Could not read configuration file. It has invalid configuration terms " <>
+                "such as functions, references, and pids. Please make sure your configuration " <>
+                "is made of numbers, atoms, strings, maps, tuples and lists. The following entries " <>
+                "are wrong:\n#{Enum.join(invalid)}"
+          end
+
+        {:error, message}
+    end
+  end
+
+  defp valid_config?(m) when is_map(m),
+    do: Enum.all?(Map.delete(m, :__struct__), &valid_config?/1)
+
+  defp valid_config?(l) when is_list(l), do: Enum.all?(l, &valid_config?/1)
+  defp valid_config?(t) when is_tuple(t), do: Enum.all?(Tuple.to_list(t), &valid_config?/1)
+  defp valid_config?(o), do: is_number(o) or is_atom(o) or is_binary(o)
+
+  defp merge_provider_config(%{config_providers: []}, sys_config, _), do: {sys_config, false}
+
+  defp merge_provider_config(release, sys_config, config_path) do
+    {reboot?, extra_config, initial_config} = start_distribution(release)
+
+    prune_runtime_sys_config_after_boot =
+      Keyword.get(release.options, :prune_runtime_sys_config_after_boot, false)
+
+    opts = [
+      extra_config: initial_config,
+      prune_runtime_sys_config_after_boot: prune_runtime_sys_config_after_boot,
+      reboot_system_after_config: reboot?,
+      validate_compile_env: validate_compile_env(release)
+    ]
+
+    init_config = Config.Provider.init(release.config_providers, config_path, opts)
+    {Config.Reader.merge(sys_config, init_config ++ extra_config), reboot?}
+  end
+
+  defp validate_compile_env(release) do
+    with true <- Keyword.get(release.options, :validate_compile_env, true),
+         [_ | _] = compile_env <- compile_env(release) do
+      compile_env
+    else
+      _ -> false
+    end
+  end
+
+  defp compile_env(release) do
+    for {_, properties} <- release.applications,
+        triplet <- Keyword.get(properties, :compile_env, []),
+        do: triplet
+  end
+
+  defp start_distribution(%{options: opts}) do
+    reboot? = Keyword.get(opts, :reboot_system_after_config, false)
+    early_distribution? = Keyword.get(opts, :start_distribution_during_config, false)
+
+    if not reboot? or early_distribution? do
+      {reboot?, [], []}
+    else
+      {true, [kernel: [start_distribution: false]], [kernel: [start_distribution: true]]}
+    end
+  end
+
+  @doc """
+  Copies the cookie to the given path.
+
+  If a cookie option was given, we compare it with
+  the contents of the file (if any), and ask the user
+  if they want to override.
+
+  If there is no option, we generate a random one
+  the first time.
+  """
+  @spec make_cookie(t, Path.t()) :: :ok
+  def make_cookie(release, path) do
+    cond do
+      cookie = release.options[:cookie] ->
+        Mix.Generator.create_file(path, cookie, quiet: true)
+        :ok
+
+      File.exists?(path) ->
+        :ok
+
+      true ->
+        File.write!(path, random_cookie())
+        :ok
+    end
+  end
+
+  defp random_cookie, do: Base.encode32(:crypto.strong_rand_bytes(32))
+
+  @doc """
+  Makes the start_erl.data file with the
+  ERTS version and release versions.
+  """
+  @spec make_start_erl(t, Path.t()) :: :ok
+  def make_start_erl(release, path) do
+    File.write!(path, "#{release.erts_version} #{release.version}")
+    :ok
+  end
+
+  @doc """
+  Makes boot scripts.
+
+  It receives a path to the boot file, without extension, such as
+  `releases/0.1.0/start` and this command will write `start.rel`,
+  `start.boot`, and `start.script` to the given path, returning
+  `{:ok, rel_path}` or `{:error, message}`.
+
+  The boot script uses the RELEASE_LIB environment variable, which must
+  be accordingly set with `--boot-var` and point to the release lib dir.
+  """
+  @spec make_boot_script(t, Path.t(), [{application(), mode()}], [String.t()]) ::
+          :ok | {:error, String.t()}
+  def make_boot_script(release, path, modes, prepend_paths \\ []) do
+    with {:ok, rel_spec} <- build_release_spec(release, modes) do
+      File.write!(path <> ".rel", consultable(rel_spec))
+
+      sys_path = String.to_charlist(path)
+
+      sys_options = [
+        :silent,
+        :no_dot_erlang,
+        :no_warn_sasl,
+        variables: build_variables(release),
+        path: build_paths(release)
+      ]
+
+      case :systools.make_script(sys_path, sys_options) do
+        {:ok, _module, _warnings} ->
+          script_path = sys_path ++ '.script'
+          {:ok, [{:script, rel_info, instructions}]} = :file.consult(script_path)
+
+          instructions =
+            instructions
+            |> post_stdlib_applies(release)
+            |> prepend_paths_to_script(prepend_paths)
+
+          script = {:script, rel_info, instructions}
+          File.write!(script_path, consultable(script))
+          :ok = :systools.script2boot(sys_path)
+
+        {:error, module, info} ->
+          message = module.format_error(info) |> to_string() |> String.trim()
+          {:error, message}
+      end
+    end
+  end
+
+  defp build_variables(release) do
+    for {_, properties} <- release.applications,
+        not Keyword.fetch!(properties, :otp_app?),
+        uniq: true,
+        do: {'RELEASE_LIB', properties |> Keyword.fetch!(:path) |> :filename.dirname()}
+  end
+
+  defp build_paths(release) do
+    for {_, properties} <- release.applications,
+        Keyword.fetch!(properties, :otp_app?),
+        do: properties |> Keyword.fetch!(:path) |> Path.join("ebin") |> to_charlist()
+  end
+
+  defp build_release_spec(release, modes) do
+    %{name: name, version: version, erts_version: erts_version, applications: apps} = release
+
+    rel_apps =
+      for {app, mode} <- modes do
+        properties = Map.get(apps, app) || throw({:error, "Unknown application #{inspect(app)}"})
+        children = Keyword.get(properties, :applications, [])
+        # validate_mode!(app, mode, modes, children)
+        build_app_for_release(app, mode, properties)
+      end
+
+    {:ok, {:release, {to_charlist(name), to_charlist(version)}, {:erts, erts_version}, rel_apps}}
+  catch
+    {:error, message} -> {:error, message}
+  end
+
+  defp validate_mode!(app, mode, modes, children) do
+    safe_mode? = mode in @safe_modes
+
+    if not safe_mode? and mode not in @unsafe_modes do
+      throw(
+        {:error,
+         "Unknown mode #{inspect(mode)} for #{inspect(app)}. " <>
+           "Valid modes are: #{inspect(@safe_modes ++ @unsafe_modes)}"}
+      )
+    end
+
+    for child <- children do
+      child_mode = Keyword.get(modes, child)
+
+      cond do
+        is_nil(child_mode) ->
+          throw(
+            {:error,
+             "Application #{inspect(app)} is listed in the release boot, " <>
+               "but it depends on #{inspect(child)}, which isn't"}
+          )
+
+        safe_mode? and child_mode in @unsafe_modes ->
+          throw(
+            {:error,
+             """
+             Application #{inspect(app)} has mode #{inspect(mode)} but it depends on \
+             #{inspect(child)} which is set to #{inspect(child_mode)}. If you really want \
+             to set such mode for #{inspect(child)} make sure that all applications that depend \
+             on it are also set to :load or :none, otherwise your release will fail to boot
+             """}
+          )
+
+        true ->
+          :ok
+      end
+    end
+  end
+
+  defp build_app_for_release(app, mode, properties) do
+    vsn = Keyword.fetch!(properties, :vsn)
+
+    case Keyword.get(properties, :included_applications, []) do
+      [] -> {app, vsn, mode}
+      included_apps -> {app, vsn, mode, included_apps}
+    end
+  end
+
+  defp post_stdlib_applies(instructions, release) do
+    {pre, [stdlib | post]} =
+      Enum.split_while(
+        instructions,
+        &(not match?({:apply, {:application, :start_boot, [:stdlib, _]}}, &1))
+      )
+
+    pre ++ [stdlib] ++ config_provider_apply(release) ++ post
+  end
+
+  defp config_provider_apply(%{config_providers: []}),
+    do: []
+
+  defp config_provider_apply(_),
+    do: [{:apply, {Config.Provider, :boot, []}}]
+
+  defp prepend_paths_to_script(instructions, []), do: instructions
+
+  defp prepend_paths_to_script(instructions, prepend_paths) do
+    prepend_paths = Enum.map(prepend_paths, &String.to_charlist/1)
+
+    Enum.map(instructions, fn
+      {:path, paths} ->
+        if Enum.any?(paths, &List.starts_with?(&1, '$RELEASE_LIB')) do
+          {:path, prepend_paths ++ paths}
+        else
+          {:path, paths}
+        end
+
+      other ->
+        other
+    end)
+  end
+
+  defp consultable(term) do
+    IO.chardata_to_string(:io_lib.format("%% coding: utf-8~n~tp.~n", [term]))
+  end
+
+  @doc """
+  Finds a template path for the release.
+  """
+  def rel_templates_path(release, path) do
+    Path.join(release.options[:rel_templates_path] || "rel", path)
+  end
+
+  @doc """
+  Copies ERTS if the release is configured to do so.
+
+  Returns true if the release was copied, false otherwise.
+  """
+  @spec copy_erts(t) :: boolean()
+  def copy_erts(%{erts_source: nil}) do
+    false
+  end
+
+  def copy_erts(release) do
+    destination = Path.join(release.path, "erts-#{release.erts_version}/bin")
+    File.mkdir_p!(destination)
+
+    release.erts_source
+    |> Path.join("bin")
+    |> File.cp_r!(destination, fn _, _ -> false end)
+
+    _ = File.rm(Path.join(destination, "erl"))
+    _ = File.rm(Path.join(destination, "erl.ini"))
+
+    destination
+    |> Path.join("erl")
+    |> File.write!(~S"""
+    #!/bin/sh
+    SELF=$(readlink "$0" || true)
+    if [ -z "$SELF" ]; then SELF="$0"; fi
+    BINDIR="$(cd "$(dirname "$SELF")" && pwd -P)"
+    ROOTDIR="${ERL_ROOTDIR:-"$(dirname "$(dirname "$BINDIR")")"}"
+    EMU=beam
+    PROGNAME=$(echo "$0" | sed 's/.*\///')
+    export EMU
+    export ROOTDIR
+    export BINDIR
+    export PROGNAME
+    exec "$BINDIR/erlexec" ${1+"$@"}
+    """)
+
+    File.chmod!(Path.join(destination, "erl"), 0o755)
+    true
+  end
+
+  @doc """
+  Copies the given application specification into the release.
+
+  It assumes the application exists in the release.
+  """
+  @spec copy_app(t, application) :: boolean()
+  def copy_app(release, app) do
+    properties = Map.fetch!(release.applications, app)
+    vsn = Keyword.fetch!(properties, :vsn)
+
+    source_app = Keyword.fetch!(properties, :path)
+    target_app = Path.join([release.path, "lib", "#{app}-#{vsn}"])
+
+    if is_nil(release.erts_source) and Keyword.fetch!(properties, :otp_app?) do
+      false
+    else
+      File.rm_rf!(target_app)
+      File.mkdir_p!(target_app)
+
+      copy_ebin(release, Path.join(source_app, "ebin"), Path.join(target_app, "ebin"))
+
+      for dir <- @copy_app_dirs do
+        source_dir = Path.join(source_app, dir)
+        target_dir = Path.join(target_app, dir)
+
+        source_dir =
+          case File.read_link(source_dir) do
+            {:ok, link_target} -> Path.expand(link_target, source_app)
+            _ -> source_dir
+          end
+
+        File.exists?(source_dir) && File.cp_r!(source_dir, target_dir)
+      end
+
+      true
+    end
+  end
+
+  @doc """
+  Copies the ebin directory at `source` to `target`
+  respecting release options such a `:strip_beams`.
+  """
+  @spec copy_ebin(t, Path.t(), Path.t()) :: boolean()
+  def copy_ebin(release, source, target) do
+    with {:ok, [_ | _] = files} <- File.ls(source) do
+      File.mkdir_p!(target)
+
+      strip_options =
+        release.options
+        |> Keyword.get(:strip_beams, true)
+        |> parse_strip_beams_options()
+
+      for file <- files do
+        source_file = Path.join(source, file)
+        target_file = Path.join(target, file)
+
+        with true <- is_list(strip_options) and String.ends_with?(file, ".beam"),
+             {:ok, binary} <- strip_beam(File.read!(source_file), strip_options) do
+          File.write!(target_file, binary)
+        else
+          _ ->
+            # Use File.cp!/3 to preserve file mode for any executables stored
+            # in the ebin directory.
+            File.cp!(source_file, target_file)
+        end
+      end
+
+      true
+    else
+      _ -> false
+    end
+  end
+
+  @doc """
+  Strips a beam file for a release.
+
+  This keeps only significant chunks necessary for the VM operation,
+  discarding documentation, debug info, compile information and others.
+
+  The exact chunks that are kept are not documented and may change in
+  future versions.
+  """
+  @spec strip_beam(binary(), keyword()) :: {:ok, binary()} | {:error, :beam_lib, term()}
+  def strip_beam(binary, options \\ []) when is_list(options) do
+    chunks_to_keep = options[:keep] |> List.wrap() |> Enum.map(&String.to_charlist/1)
+    all_chunks = Enum.uniq(@significant_chunks ++ chunks_to_keep)
+
+    case :beam_lib.chunks(binary, all_chunks, [:allow_missing_chunks]) do
+      {:ok, {_, chunks}} ->
+        chunks = for {name, chunk} <- chunks, is_binary(chunk), do: {name, chunk}
+        {:ok, binary} = :beam_lib.build_module(chunks)
+        {:ok, :zlib.gzip(binary)}
+
+      {:error, _, _} = error ->
+        error
+    end
+  end
+
+  defp parse_strip_beams_options(options) do
+    case options do
+      options when is_list(options) -> options
+      true -> []
+      false -> nil
+    end
+  end
+end
diff --git a/mix_release.sh b/mix_release.sh
index 24a572301..23bdab1b3 100755
--- a/mix_release.sh
+++ b/mix_release.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -e
+
 mix release --overwrite
 cp -r apps/emqx/etc/certs _build/dev/rel/emqx/etc/certs
 cp temp/sys.config _build/dev/rel/emqx/releases/5.0.0-beta.2-3fdc075b/