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Update PACKAGERS.md with some text changes, including and especially moving "LXC" to a new "Optional Dependencies" section 

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
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Tianon Gravi 2014-03-04 21:25:00 -07:00
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@ -142,30 +142,46 @@ dependencies to be installed (see below).
The test suite will also download a small test container, so you will need internet connectivity. The test suite will also download a small test container, so you will need internet connectivity.
## Runtime dependencies ## Dependencies
### Runtime
To run properly, docker needs the following software to be installed at runtime: To run properly, docker needs the following software to be installed at runtime:
* iproute2 version 3.5 or later (build after 2012-05-21), and specifically the "ip" utility * iproute2 version 3.5 or later (build after 2012-05-21), and specifically the "ip" utility
* iptables version 1.4 or later * iptables version 1.4 or later
* The LXC utility scripts (http://lxc.sourceforge.net) version 0.8 or later
* Git version 1.7 or later * Git version 1.7 or later
* XZ Utils 4.9 or later * XZ Utils 4.9 or later
## Kernel dependencies ### Kernel
Docker in daemon mode has specific kernel requirements. For details, see Docker in daemon mode has specific kernel requirements. Most pre-packaged
http://docs.docker.io/en/latest/installation/kernel/ kernels include the necessary options enabled. If you are building your own
kernel, you will either need to discover the options necessary via trial and
error, or check out the [Gentoo
ebuild](https://github.com/tianon/docker-overlay/blob/master/app-emulation/docker/docker-9999.ebuild),
in which a list is maintained.
Note that Docker also has a client mode, which can run on virtually any linux kernel (it even builds Note that Docker also has a client mode, which can run on virtually any linux kernel (it even builds
on OSX!). on OSX!).
### Optional
Some of Docker's features are activated by using optional command-line flags or
by having support for them in the kernel or userspace. A few examples include:
* LXC execution driver (requires version 0.8 or later of the LXC utility scripts)
* AUFS graph driver (requires AUFS patches/support enabled in the kernel, and at
least the "auplink" utility from aufs-tools)
* BTRFS graph driver (requires BTRFS support enabled in the kernel)
## Init script ## Init script
Docker expects to run as a daemon at machine startup. Your package will need to include a script Docker expects to run as a daemon at machine startup. Your package will need to include a script
for your distro''s process supervisor of choice. for your distro's process supervisor of choice. Be sure to check out the
"contrib/init" folder in case a suitable init script already exists!
Docker should be run as root, with the following arguments: In general, Docker should be run as root, with the following arguments:
```bash ```bash
docker -d docker -d