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Docker registry bay

Enables distributed image pull with torrent via transparent proxy.

WARNING: this is super-duper experimental POC, don't run it in production yet.

Components

Tracker

Tracker downloads image from the registry and creates torrent distribution. You would probably want to run several of them for high availability.

Proxy

Proxy sits between docker and the registry, usually on the same server where docker is running. It acts as a transparent proxy for metadata, but enables p2p download of image layers with the help of trackers.

How to make it work

This was only tested with self-hosted docker registry. Docker hub works a little bit differently than self-hosted registry to make it work with p2p easily.

Let's run tracker on 192.168.0.1 (host1) and proxies on 192.168.0.{2,3,4} (host{2,3,4}).

host1> docker run -d --net=host bobrik/bay-tracker \
  -listen 192.168.0.1:8888 -tracker 192.168.0.4:6881 -root /tmp

Now let's run local proxies on each box:

host2> docker run -d -p 127.0.0.1:80:80 bobrik/bay-proxy \
  -tracker http://192.168.0.1:8888/ -listen :80 -root /tmp

host3> docker run -d -p 127.0.0.1:80:80 bobrik/bay-proxy \
  -tracker http://192.168.0.1:8888/ -listen :80 -root /tmp

host4> docker run -d -p 127.0.0.1:80:80 bobrik/bay-proxy \
  -tracker http://192.168.0.1:8888/ -listen :80 -root /tmp

In /etc/hosts on each machine add the next record:

127.0.0.1 p2p-<my-registry.com>

where my-registry.com should be your usual registry.

After that on host{2,3,4} you can run:

docker pull p2p-<my-registry.com>/myimage

and it will work just like

docker pull <my-registry.com>/myimage

but with p2p magic and unicorns.