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

分布式安全与 Cookie

使用魔术 Cookie、节点命名和 TLS 分布式通信，保护分布式 Erlang 节点之间的通信。

分布式安全与 Cookie 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。

Trust in a Cluster

Connected Erlang nodes fully trust each other: any node can run code on any other. That power makes securing distribution essential.

The Magic Cookie

Each node has a secret cookie. Two nodes can only connect if their cookies match. It is the basic authentication mechanism for clustering.

erlang:get_cookie().
% => 'SECRETCOOKIE'

Setting the Cookie

You can set the cookie at startup or at runtime. All nodes that should cluster must share the same value.

% at startup:
% erl -setcookie SECRET -name node1@host

erlang:set_cookie(node(), 'SECRET').

The .erlang.cookie File

If not set explicitly, the VM reads ~/.erlang.cookie. It must have restrictive permissions or the VM refuses to start.

% chmod 400 ~/.erlang.cookie

Short vs Long Names

Nodes use -sname (short hostname) or -name (fully qualified). Both nodes must use the same scheme to connect.

% erl -sname worker
% erl -name worker@10.0.0.5

Cookies Are Not Encryption

A matching cookie only authenticates the connection. By default, traffic between nodes is unencrypted. On untrusted networks you need TLS.

TLS Distribution

Erlang can tunnel all inter-node traffic over TLS using the inet_tls_dist module, configured via a proto_dist flag and a certificate file.

% erl -proto_dist inet_tls \
%     -ssl_dist_optfile ssl_dist.conf \
%     -name node1@host

The ssl_dist Config

The config file points to your certificate, key, and CA so nodes mutually authenticate and encrypt.

[{server, [{certfile, "node.pem"},
           {keyfile, "node.key"},
           {cacertfile, "ca.pem"}]},
 {client, [{cacertfile, "ca.pem"}]}].

Restricting epmd Exposure

The Erlang Port Mapper Daemon (epmd) registers node ports. Never expose epmd or distribution ports to the public internet; firewall them or use a VPN.

Hidden Nodes

A node started with -hidden connects without joining the global mesh, useful for tools that should not be part of the cluster's full-trust topology.

% erl -hidden -name monitor@host

Security Checklist

For safe distribution:

Use a strong, unique cookie
Protect the cookie file (chmod 400)
Enable TLS on untrusted networks
Firewall epmd and distribution ports

Quick Check

Test your distribution security knowledge.

Recap

You learned to secure distributed Erlang.

Matching cookies authenticate nodes
Protect the .erlang.cookie file
Use TLS distribution for encryption
Firewall epmd and distribution ports

常见问题解答

「分布式安全与 Cookie」课时是免费的吗？

是的 — 「分布式安全与 Cookie」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。

「分布式安全与 Cookie」这节课中我会学到什么？

使用魔术 Cookie、节点命名和 TLS 分布式通信，保护分布式 Erlang 节点之间的通信。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。

「分布式安全与 Cookie」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

← 返回 Erlang OTP: Distributed & Fault-Tolerant Systems Programming