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Add fedora 22 install docs warning about systemd-network 

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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@ -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 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
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 ## Uninstall