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Add fedora 22 install docs warning about systemd-network

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Following @cles commit #6bd15a68c for Arch

Signed-off-by: yyekhlef <yyekhlef@gmail.com>
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Youcef YEKHLEF 2015-08-03 23:37:48 +02:00 • committed by yyekhlef
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commit f224a9f3d6
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docs/installation/fedora.md
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@ -206,6 +206,22 @@ 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
learn how to [customize your Systemd Docker daemon options](/articles/systemd/).
## Running Docker with a manually-defined network
If you manually configure your network using `systemd-network` with fedora version 22, containers you start with Docker may be unable to access your network.
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
`/usr/lib/systemd/network/` on your Docker host (ex: `/usr/lib/systemd/network/80-container-host0.network`) add the following block:
```
[Network]
...
IPForward=kernel
...
```
This configuration allows IP forwarding from the container as expected.
## Uninstall