Enables distributed image pull with torrent via transparent proxy.
WARNING: this is super-duper experimental POC, don't run it in production yet.
Tracker downloads image from the registry and creates torrent distribution. You would probably want to run several of them for high availability.
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.
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.