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much improved wording for manual network config setup on arch install docs by @moxiegirl

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Signed-off-by: Oriol Francès <oriolfa@gmail.com>
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Oriol Francès 2015-07-26 19:11:27 +02:00
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23
docs/installation/archlinux.md
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@ -66,11 +66,17 @@ If you need to add an HTTP Proxy, set a different directory or partition for the
Docker runtime files, or make other customizations, read our systemd article to Docker runtime files, or make other customizations, read our systemd article to
learn how to [customize your systemd Docker daemon options](/articles/systemd/). learn how to [customize your systemd Docker daemon options](/articles/systemd/).
## Running docker with a manually defined network ## Running Docker with a manually-defined network
Users of systemd-network >= v220 who have configured their network manually by If you manually configure your network using `systemd-network` version 220 or
creating an `<interface>.network` file in `/etc/systemd/network/` may have to add higher, containers you start with Docker may be unable to access your network.
the following line to make sure IP Forwarding is not disabled: Beginning with version 220, the forwarding setting for a given network
(`net.ipv4.conf.<interface>.forwarding`) defaults to *off*. This setting
prevents IP forwarding. It also conflicts with Docker which enables the
`net.ipv4.conf.all.forwarding` setting within a container.
To work around this, edit the `<interface>.network` file in
`/etc/systemd/network/` on your Docker host add the following block:
``` ```
[Network] [Network]
@ -79,14 +85,7 @@ IPForward=kernel
... ...
``` ```
From systemd-network v220 onwards, the forwarding setting for a given network This configuration allows IP forwarding from the container as expected.
defaults to *off* (instead of not being set). This prevents IP Forwarding to
happen, since docker only enables `net.ipv4.conf.all.forwarding` (which is
overriden by `net.ipv4.conf.<interface>.forwarding` being disabled)
Adding `IPForward=kernel` to the `<interface>.network` file prevents this
behavior, allowing IP Forwarding to function as expected.
## Uninstallation ## Uninstallation
To uninstall the Docker package: To uninstall the Docker package: