docs: Add systemd documentation

* Describe how to use the reference service.
* Closes #200
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Kyle Manna 2017-01-16 13:55:42 -08:00
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# Docker + OpenVPN systemd Service
The systemd service aims to make the update and invocation of the
`docker-openvpn` container seamless. It automatically downloads the latest
`docker-openvpn` image and instantiates a Docker container with that image. At
shutdown it cleans-up the old container.
In the event the service dies (crashes, or is killed) systemd will attempt to
restart the service every 10 seconds until the service is stopped with
`systemctl stop docker-openvpn@NAME.service`.
A number of IPv6 hacks are incorporated to workaround Docker shortcomings and
are harmless for those not using IPv6.
To use and enable automatic start by systemd:
1. Create a Docker volume container named `ovpn-data-NAME` where `NAME` is the
user's choice to describe the use of the container. In the example
configuration given in the [README](/README.md) `NAME=data`.
2. Initialize the data container according to the [docker-openvpn
README](/README.md), but don't start the container. Stop the Docker
container if started.
3. Download the [docker-openvpn@.service](https://raw.githubusercontent.com/kylemanna/docker-openvpn/master/init/docker-openvpn%40.service)
file to `/etc/systemd/system`:
curl -L https://raw.githubusercontent.com/kylemanna/docker-openvpn/master/init/docker-openvpn%40.service | sudo tee /etc/systemd/system/docker-openvpn@.service
4. Enable and start the service with:
systemctl enable --now docker-openvpn@NAME.service
5. Verify service start-up with:
systemctl status docker-openvpn@NAME.service
journalctl --unit docker-openvpn@NAME.service
For more information, see the [systemd manual pages](https://www.freedesktop.org/software/systemd/man/index.html).

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#
# Docker + OpenVPN systemd service
#
# Author: Kyle Manna <kyle@kylemanna.com>
# Source: https://github.com/kylemanna/docker-openvpn
#
# This service aims to make the update and invocation of the docker-openvpn
# container seemless. It automatically downloads the latest docker-openvpn
# image and instantiates a Docker container with that image. At shutdown it
# cleans-up the old container.
#
# In the event the service dies (crashes, or is killed) systemd will attempt
# to restart the service every 10 seconds until the service is stopped with
# `systemctl stop docker-openvpn@NAME`.
#
# A number of IPv6 hacks are incorporated to workaround Docker shortcomings and
# are harmless for those not using IPv6.
#
# To use:
# 1. Create a Docker volume container named `ovpn-data-NAME` where NAME is the
# user's choice to describe the use of the container.
# 2. Initialize the data container according to the docker-openvpn README, but
# don't start the container. Stop the docker container if started.
# 3. Download this service file to /etc/systemd/service/docker-openvpn@.service
# 4. Enable and start the service template with:
# `systemctl enable --now docker-openvpn@NAME.service`
# 5. Verify service start-up with:
# `systemctl status docker-openvpn@NAME.service`
# `journalctl --unit docker-openvpn@NAME.service`
#
# For more information, see the systemd manual pages.
#
[Unit]
Description=OpenVPN Docker Container
Documentation=https://github.com/kylemanna/docker-openvpn