Add Linux platform page

platform-linux.md

@@ -0,0 +1,118 @@
+---
+tags: dontlink
+---
+
+# Linux
+
+Yggdrasil is well supported on Linux.
+
+## Notes
+
+- Should work with any kernel that includes `tun` and/or `tap`.
+- TAP mode is not supported on macOS, therefore the `IfTAPMode` option will have
+no effect.
+- The maximum MTU size supported on macOS is 65535.
+
+## Debian
+
+Debian binary packages exist to simplify the installation of Yggdrasil. These
+will also work on any Debian-based distribution such as elementaryOS.
+
+### From CircleCI
+
+Visit our [Builds](builds.md) page and download the relevant `.deb` file, then
+install it on your system:
+```
+sudo dpkg -i yggdrasil...deb
+```
+
+### From an Internet repository
+
+To start with, trust the repository key:
+```
+curl -o- http://neilalexander.s3.eu-west-2.amazonaws.com/deb/key.txt | sudo apt-key add -
+```
+
+Add the repository:
+```
+echo 'deb http://neilalexander.s3.eu-west-2.amazonaws.com/deb/ debian yggdrasil' | sudo tee /etc/apt/sources.list.d/yggdrasil.list
+sudo apt-get update
+```
+
+Install Yggdrasil:
+```
+sudo apt-get install yggdrasil
+```
+Configuration will be generated automatically into `/etc/yggdrasil.conf` when
+the package is installed, and the Yggdrasil service will automatically be
+installed into systemd and started.
+
+## Other Distributions
+
+[Download the latest Yggdrasil binary](https://circleci.com/api/v1.1/project/github/yggdrasil-network/yggdrasil-go/latest/artifacts) and install it:
+```
+sudo cp ~/yggdrasil-x.x.xx-linux-amd64 /usr/bin/yggdrasil
+sudo chmod +x /usr/bin/yggdrasil
+```
+Alternatively, compile Yggdrasil from source (below) and install:
+```
+sudo cp /path/to/yggdrasil-go/yggdrasil /usr/bin/yggdrasil
+sudo chmod +x /usr/bin/yggdrasil
+```
+
+## Generate configuration
+
+If you do not have a configuration file, you should generate configuration
+before starting Yggdrasil:
+```
+sudo yggdrasil -genconf > /etc/yggdrasil.conf
+```
+
+## Run Yggdrasil
+
+### Run once
+
+Open a shell and start Yggdrasil using your generated configuration:
+```
+sudo nohup yggdrasil -useconffile /etc/yggdrasil.conf &
+```
+Alternatively, start Yggdrasil in auto-configuration mode:
+```
+sudo nohup yggdrasil -autoconf &
+```
+
+### Run with systemd
+
+systemd service scripts are included in the `contrib/systemd/` folder so that it
+runs automatically in the background (using `/etc/yggdrasil.conf` for
+configuration).
+
+Copy the service files into `/etc/systemd/system`, copy `yggdrasil` into your
+`$PATH`, i.e. `/usr/bin`, and then enable the service:
+```
+systemctl enable yggdrasil
+systemctl start yggdrasil
+```
+
+Once installed as a systemd service, you can read the `yggdrasil` output:
+```
+systemctl status yggdrasil
+journalctl -u yggdrasil
+```
+
+## Build instructions
+
+Linux has most of the tools needed to build Yggdrasil from source - you just
+need to install Go 1.9 or later.
+
+1. Install Go 1.9 or later, [godeb](https://github.com/niemeyer/godeb) is
+recommended for Debian-based distributions).
+1. Open a shell, clone the repository and build:
+```
+cd /path/to
+git clone https://github.com/yggdrasil-network/yggdrasil-go
+cd yggdrasil-go
+./build
+```
+1. The resulting `yggdrasil` file is your build - optionally install it into
+your system, as above.

platforms.md

@@ -2,18 +2,7 @@
 
 ## Linux
 
-- Should work out of the box on most Linux distributions.
+- See the [Linux platform page](platform-linux.md).
-- systemd service scripts are included in the `contrib/systemd/` folder so that it runs automatically in the background (using `/etc/yggdrasil.conf` for configuration), copy the service files into `/etc/systemd/system`, copy `yggdrasil` into your `$PATH`, i.e. `/usr/bin`, and then enable the service:
-```
-systemctl enable yggdrasil
-systemctl start yggdrasil
-```
-- Once installed as a systemd service, you can read the `yggdrasil` output:
-```
-systemctl status yggdrasil
-journalctl -u yggdrasil
-```
-- If you are running a Debian-based system (including Ubuntu and elementaryOS), you may instead prefer to use the [automatically built](builds.md) Debian packages. These install the systemd scripts and generate a configuration file into `/etc/yggdrasil.conf` automatically, and can be easily upgraded when needed.
 
 ## macOS