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Renato Riccieri Santos Zannon f05f5b2a20 Add IP forwarding config to archlinux guide

I had this small issue when following this guide on my Arch box, and I don't think it is specific to any configuration I have.
Upstream-commit: b2084a9c599d91fa1460116ef0c8d509d3353103
Component: engine

2013-05-30 01:56:08 -03:00

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title: Installation on Arch Linux
description: Docker installation on Arch Linux.
keywords: arch linux, virtualization, docker, documentation, installation

Arch Linux

Please note this is a community contributed installation path. The only 'official' installation is using the ubuntu_linux installation path. This version may sometimes be out of date.

Installing on Arch Linux is not officially supported but can be handled via either of the following AUR packages:

The lxc-docker package will install the latest tagged version of docker. The lxc-docker-git package will build from the current master branch.

Dependencies

Docker depends on several packages which are specified as dependencies in either AUR package.

aufs3
bridge-utils
go
iproute2
linux-aufs_friendly
lxc

Installation

The instructions here assume yaourt is installed. See Arch User Repository for information on building and installing packages from the AUR if you have not done so before.

Keep in mind that if linux-aufs_friendly is not already installed that a new kernel will be compiled and this can take quite a while.

yaourt -S lxc-docker-git

Starting Docker

Prior to starting docker modify your bootloader to use the linux-aufs_friendly kernel and reboot your system.

There is a systemd service unit created for docker. To start the docker service:

sudo systemctl start docker

To start on system boot:

sudo systemctl enable docker

Network Configuration

IPv4 packet forwarding is disabled by default on Arch, so internet access from inside the container may not work.

To enable the forwarding, run as root on the host system:

sysctl net.ipv4.ip_forward=1

And, to make it persistent across reboots, enable it on the host's /etc/sysctl.conf:

net.ipv4.ip_forward=1

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