0Pricing
Erlang OTP: Distributed & Fault-Tolerant Systems Programming · 课时

构建 OTP 应用与发布包

将 GenServers 和监督者组织成规范的 OTP 应用，并将其打包为可部署的发布包。

构建 OTP 应用与发布包 是 CoddyKit 上的免费 Erlang OTP: Distributed & Fault-Tolerant Systems Programming 课时。 这是第 4 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 Erlang OTP: Distributed & Fault-Tolerant Systems Programming 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Erlang OTP: Distributed & Fault-Tolerant Systems Programming 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

What Is an OTP Application?

An OTP application is a reusable component with a defined lifecycle: it starts, runs a supervision tree, and stops cleanly. It is the standard unit of packaging in Erlang.

The .app Resource File

Every application has an .app file describing its metadata: name, modules, dependencies, and the callback module that starts it.

{application, myapp,
 [{description, "My App"},
  {vsn, "1.0.0"},
  {modules, [myapp_app, myapp_sup]},
  {applications, [kernel, stdlib]},
  {mod, {myapp_app, []}}]}.

The application Behavior

The module named in mod implements the application behavior with start/2 and stop/1 callbacks.

-module(myapp_app).
-behaviour(application).
-export([start/2, stop/1]).

start/2

start/2 is called when the application launches. It starts the top supervisor and returns its pid.

start(_Type, _Args) ->
    myapp_sup:start_link().

stop/1

stop/1 is called on shutdown for cleanup. Often it simply returns ok.

stop(_State) ->
    ok.

Starting & Stopping

From the shell you can control applications at runtime.

application:start(myapp).
application:stop(myapp).

Application Environment

Configuration lives in the env section of the .app file and is read with application:get_env.

application:get_env(myapp, port).
% => {ok, 8080}

What Is a Release?

A release bundles your application, its dependencies, and a trimmed Erlang runtime into a single self-contained, deployable artifact.

Building with rebar3

The rebar3 build tool creates releases from a relx config in rebar.config.

{relx, [{release, {myapp, "1.0.0"}, [myapp]},
        {dev_mode, false},
        {include_erts, true}]}.

Running a Release

The generated release includes scripts to start, stop, and attach a console to the running node.

% rebar3 release
% _build/default/rel/myapp/bin/myapp foreground

Why Releases Matter

Releases give reproducible deployments: the exact runtime, app versions, and config travel together, and they support hot code upgrades, a hallmark of Erlang systems.

Quick Check

Test your OTP application knowledge.

Recap

You learned to package OTP code.

  • The .app file describes metadata and the start module
  • The application behavior provides start/2 and stop/1
  • Releases bundle app + runtime for reproducible deployment

常见问题解答

「构建 OTP 应用与发布包」课时是免费的吗？

是的 — 「构建 OTP 应用与发布包」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Erlang OTP: Distributed & Fault-Tolerant Systems Programming 课程的其余内容，请升级到 CoddyKit PRO。 Erlang OTP: Distributed & Fault-Tolerant Systems Programming 课程共包含 4 节课。

「构建 OTP 应用与发布包」这节课中我会学到什么？

将 GenServers 和监督者组织成规范的 OTP 应用，并将其打包为可部署的发布包。 你通过在浏览器中直接运行的动手代码来练习 Erlang OTP: Distributed & Fault-Tolerant Systems Programming，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Erlang OTP: Distributed & Fault-Tolerant Systems Programming 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Erlang OTP: Distributed & Fault-Tolerant Systems Programming 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 4 节课，共 4 节。

「构建 OTP 应用与发布包」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Erlang OTP: Distributed & Fault-Tolerant Systems Programming 课中编写并运行代码吗？

能。每节 Erlang OTP: Distributed & Fault-Tolerant Systems Programming 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

此课程中的所有课时

  1. 理解 OTP 与行为
  2. 实现 GenServer 行为
  3. 监管者入门
  4. 构建 OTP 应用与发布包
← 返回 Erlang OTP: Distributed & Fault-Tolerant Systems Programming