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本节中的信息涵盖了用户定义网络中的容器的嵌入式 DNS 服务器操作。与连接到default bridge网络的容器相比，连接到用户定义网络的容器的 DNS 查找工作方式不同。
注意：为了保持向后兼容性，
default bridge网络中的 DNS 配置将保留，而不会改变行为。有关网络中 DNS 配置的更多信息，请参阅默认default bridge网桥中的 DNS 布局 。
从Docker 1.10开始，docker 守护进程实现了一个嵌入式 dns 服务器，它为使用有效的 dns 创建的任何容器提供内建服务发现。name或net-alias或别名为link有关 Docker 如何管理容器内的 DNS 配置的详细信息，可以从一个 Docke r版本更改为下一个版本。因此，您不应该假设文件的方式，例如/etc/hosts，/etc/resolv.conf在容器中进行管理，并将文件保持在单独的位置，然后使用以 下Docker 选项。
影响容器域名服务的各种容器选项。
--name = CONTAINER-NAME | 使用--name 配置的容器名称用于发现用户定义的泊坞网内的容器。嵌入式 DNS 服务器维护容器名称和其IP地址（在容器连接的网络上）之间的映射。 |
|---|---|
--network-alias=ALIAS | 除了上面描述的名称之外，容器还可以通过其中一个或多个配置的网络别名（或 docker 网络连接命令中的--alias）在用户定义的网络中发现。嵌入式 DNS 服务器维护所有容器别名与其在特定用户定义网络上的 IP 地址之间的映射。通过在 docker network connect 命令中使用--alias 选项，容器可以在不同网络中具有不同的别名。 |
--link = CONTAINER_NAME：ALIAS | 在运行容器时使用此选项可为嵌入式 DNS 添加一个名为 ALIAS 的额外条目，该条目指向由 CONTAINER_NAME 标识的容器的 IP 地址。当使用 - 链接嵌入式 DNS 时，将保证仅在使用--link 的容器上进行本地化查找结果。这使得新容器内的进程可以连接到容器，而无需知道其名称或 IP。 |
--dns = IP_ADDRESS ... | 如果嵌入式 DNS 服务器无法解析来自容器的名称解析请求，则通过--dns 选项传递的 IP 地址将被嵌入式 DNS 服务器用于转发DNS查询。这些--dns IP 地址由嵌入式DNS服务器管理，并且不会在容器的/etc/resolv.conf 文件中更新。 |
--dns-search=DOMAIN... | 设置在容器内部使用裸露的不合格主机名时搜索的域名。这些--dns-search 选项由嵌入式 DN S服务器管理，不会在容器的/etc/resolv.conf 文件中更新。例如，当容器进程尝试访问主机并设置搜索域 example.com 时，DNS 逻辑不仅会查找主机，还会查找 host.example.com。 |
--dns-opt=OPTION... | 设置 DNS 解析器使用的选项。这些选项由嵌入式 DNS 服务器管理，不会在容器的/etc/resolv.conf文件中更新。有关有效选项的列表，请参阅 resolv.conf 的文档。 |
在不存在的--dns=IP_ADDRESS...，--dns-search=DOMAIN...或--dns-opt=OPTION...选择，Docker 使用/etc/resolv.conf主机（其中的docker守护进程（daemon）中运行）。这样做时，守护进程（daemon）会从主机的原始文件中过滤掉所有本地主机 IP 地址条目nameserver。
过滤是必要的，因为主机上的所有本地主机地址都无法从容器的网络访问。在过滤之后，如果容器的/etc/resolv.conf文件中没有剩余nameserver条目，守护进程（daemon）将公共 Google DNS 名称服务器（8.8.8.8和8.8.4.4）添加到容器的
DNS 配置中。如果守护程序启用了 IPv6，则还将添加公共 IPv6 Google DNS 名称服务器（2001：4860：4860 :: 8888和2001：4860：4860 :: 8844）。
注意：如果您需要访问主机的本地主机解析程序，则必须修改主机上的 DNS 服务以侦听可从容器内访问的非本地主机地址。注意：DNS 服务器始终处于
127.0.0.11。