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Fix: add doc of DNS fallback #23713

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Fix: add doc of DNS fallback #23713

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5 changes: 5 additions & 0 deletions content/manuals/engine/network/_index.md
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Expand Up @@ -190,6 +190,11 @@ You can configure DNS resolution on a per-container basis, using flags for the
The following table describes the available `docker run` flags related to DNS
configuration.

> [!NOTE]
>
> In case no non-localhost DNS is defined in the `/etc/resolve.conf`,
> Docker Engine automatically adds a fallback DNS configuration using public Google DNS servers (8.8.8.8 and 8.8.4.4).

| Flag | Description |
| -------------- |-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `--dns` | The IP address of a DNS server. To specify multiple DNS servers, use multiple `--dns` flags. DNS requests will be forwarded from the container's network namespace so, for example, `--dns=127.0.0.1` refers to the container's own loopback address. |
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