# 32.8.零配置网络（mDNS/DNS-SD）

零配置网络（[Zero-configuration networking](https://en.wikipedia.org/wiki/Zero-configuration_networking)，有时被称为 *Zeroconf*）是一组简化网络配置的技术。Zeroconf 的主要部分包括：

* 链路本地寻址（Link-Local Addressing），提供数值型网络地址的自动分配。
* 多播 DNS（*mDNS*），提供主机名的自动分发与解析。
* 基于 DNS 的服务发现（*DNS-SD*），提供服务实例的自动发现。

## 32.8.1. 配置和启动 Avahi

zeroconf 的一个流行实现是 [Avahi](https://avahi.org/)。可以使用以下命令安装和配置 Avahi：

```sh
# pkg install avahi-app nss_mdns
# grep -q '^hosts:.*\<mdns\>' /etc/nsswitch.conf || sed -i "" 's/^hosts: .*/& mdns/' /etc/nsswitch.conf
# service dbus enable
# service avahi-daemon enable
# service dbus start
# service avahi-daemon start
```


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