OpenVPN for Docker
This is a fork of jpetazzo/dockvpn that
removes the serveconfig http server and adds the option to upload the client
config file to an S3 Bucket.
# Just runs the OpenVPN server docker run -d --name ovpn-server --privileged -p 1194:1194/udp -p 443:443/tcp potz/dockvpn # Runs the OpenVPN server and uploads the client config file to S3 docker run -d --name ovpn-server --privileged -p 1194:1194/udp -p 443:443/tcp \ -e AWS_ACCESS_KEY_ID=my_access_key \ -e AWS_SECRET_ACCESS_KEY=my_secret \ -e S3_BUCKET=my_bucket \ -e S3_KEY=clientconfig.ovpn \ potz/dockvpn
Now download the file from your Amazon S3 Bucket.
The file can be used immediately as an OpenVPN profile. It embeds all the
required configuration and credentials. It has been tested successfully on
Linux, Windows, and Android clients. If you can test it on OS X and iPhone,
let me know!
If you reboot the server (or stop the container) and you
again, you will create a new service (with a new configuration) and
you will have to re-download the configuration file. However, you can
docker start to restart the service without touching the configuration.
How does it work?
potz/dockvpn image is started, it generates:
- Diffie-Hellman parameters,
- a private key,
- a self-certificate matching the private key,
- two OpenVPN server configurations (for UDP and TCP),
- an OpenVPN client profile.
Then, it starts two OpenVPN server processes (one on 1194/udp, another
tun mode, because it works on the widest range of devices.
tap mode, for instance, does not work on Android, except if the device
The topology used is
net30, because it works on the widest range of OS.
p2p, for instance, does not work on Windows.
The TCP server uses
192.168.255.0/25 and the UDP server uses
The client profile specifies
redirect-gateway def1, meaning that after
establishing the VPN connection, all traffic will go through the VPN.
This might cause problems if you use local DNS recursors which are not
directly reachable, since you will try to reach them through the VPN
and they might not answer to you. If that happens, use public DNS
resolvers like those of Google (126.96.36.199 and 188.8.131.52) or OpenDNS
(184.108.40.206 and 220.127.116.11).
For simplicity, the client and the server use the same private key and
certificate. This is certainly a terrible idea. If someone can get their
hands on the configuration on one of your clients, they will be able to
connect to your VPN, and you will have to generate new keys. Which is,
by the way, extremely easy, since each time you
docker run the OpenVPN
image, a new key is created. If someone steals your configuration file
(and key), they will also be able to impersonate the VPN server (if they
can also somehow hijack your connection).
It would probably be a good idea to generate two sets of keys.
It would probably be even better to generate the server key when
running the container for the first time (as it is done now), but
generate a new client key each time the
serveconfig command is
called. The command could even take the client CN as argument, and
revoke command could be used to revoke previously issued
Verified to work with ...
People have successfully used this VPN server with clients such as:
- OpenVPN on Linux,
- Viscosity on OSX (#25),
- Tunnelblick on OSX,
- (some VPN client on Android but I can't remember which).