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Private Internet Access OpenVPN Client

Private Internet Access docker container

forked from: https://github.com/DeltaAngle/pia-openvpn

Based on Apline Linux to be tiny!

Kudos to ColinHerbet and swmacdonald for their work

What is Private Internet Access

Private Internet Access VPN Service encrypts your connection and provides you with an anonymous IP to protect your privacy.

How to use this image

This image provides the configuration file for each region managed by PIA.

The goal is to start this container first then run other container within the PIA VPN via --net=container:pia.

Starting the client

docker run --privileged --cap-add=NET_ADMIN --device=/dev/net/tun --name=pia -d \
  --dns 209.222.18.222 --dns 209.222.18.218 \
  -e 'REGION=US East' \
  -e 'USERNAME=pia_username' \
  -e 'PASSWORD=pia_password' \
  conlon/pia-openvpn

Due to the nature of the VPN client, this container must be started with some additional privileges, --privileged, --cap-add=NET_ADMIN and --device=/dev/net/tun make sure that the tunnel can be created from within the container.

Starting the container in privileged mode seems to be required. I was unable to get this to work with the /dev/net/tun without running in privileged mode.

Creating a container that uses PIA VPN

docker run --rm --net=container:pia \
    tutum/curl \
    curl -s ifconfig.co

The IP address returned after this execution should be different from the IP address you would get without specifying --net=container:pia.

Advanced usage

Additional arguments for the openvpn client

Every parameter provided to the docker run command is directly passed as an argument to the openvpn executable.

This will run the openvpn client with the --pull option:

docker run ... --name=pia \
  conlon/pia-openvpn \
    --pull

Avoiding using environment variables for credentials

By default this image relies on the variables USERNAME and PASSWORD to be set in order to successfully connect to the PIA VPN.

It is possible to use instead a pre-existing volume/file containing the credentials. (Note the :Z for SELINUX)

docker run ... --name=pia \
  -e 'REGION=US East' \
  -v '/hostpath/auth.conf:/etc/openvpn/auth.conf:Z' \
  conlon/pia-openvpn \
    --auth-user-pass auth.conf

Connection between containers behind PIA

Any container started with --net=container:... will use the same network stack as the underlying container, therefore they will share the same local IP address.

Prior to Docker 1.9 --link=pia:mycontainer was the recommended way to connect to a specific container.

Since Docker 1.9, it is recommended to use a non default network allowing containers to address each other by name.

Creation of a network

docker network create pia_network

This creates a network called pia_network in which containers can address each other by name; the /etc/hosts is updated automatically for each container added to the network.

Start the PIA container in the pia_network

docker run ... --net=pia_network --name=pia conlon/pia-openvpn

In pia_network there is now a resolvable name pia that points to that newly created container.

Create a container behind the PIA VPN

This step is the same as the earlier one

# Create an HTTP service that listens on port 80
docker run ... --net=container:pia --name=myservice myservice

This container is not addressable by name in pia_network, but given that the network stack used by myservice is the same as the pia container, they have the same IP address and the service running in this container will be accessible at http://pia:80.

Create a container that access the service

docker run ... --net=pia_network tutum/curl curl -s http://pia/

The container is started within the same network as pia but is not behind the VPN. It can access services started behind the VPN container such as the HTTP service provided by myservice.

Access the service from your local network

A service created behind the VPN container will not be accessible from a client located outside of the server on which it runs. This is because Docker runs on a different IP range than such client, and therefore the client's traffic is considered as non-local and is routed out through the VPN.

The environment variable LOCAL_NETWORK can be set to let the pia container know the range corresponding to your local network. For instance, if your local network uses IP range 192.168.1.0/24 and the service listens on port 80 (provided that the server's firewall is set to not block port 80):

docker run ... -p 80:80 -e LOCAL_NETWORK=192.168.1.0/24 --net=pia_network --name=pia conlon/pia-openvpn
docker run ... --net=container:pia --name=myservice myservice

This is inspired by haugene/docker-transmission-openvpn.