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We set SO_REUSEADDR on sockets used for host port mappings by docker-proxy - which means it's possible to bind the same port on a specific address as well as 0.0.0.0/::. For TCP sockets, an error is raised when listen() is called on both sockets - and the port allocator will be called again to avoid the clash (if the port was allocated from a range, otherwise the container will just fail to start). But, for UDP sockets, there's no listen() - so take more care to avoid the clash in the portallocator. The port allocator keeps a set of allocated ports for each of the host IP addresses it's seen, including 0.0.0.0/::. So, if a mapping to 0.0.0.0/:: is requested, find a port that's free in the range for each of the known IP addresses (but still only mark it as allocated against 0.0.0.0/::). And, if a port is requested for specific host addresses, make sure it's also free in the corresponding 0.0.0.0/:: set (but only mark it as allocated against the specific addresses - because the same port can be allocated against a different specific address). Signed-off-by: Rob Murray <rob.murray@docker.com>
libnetwork - networking for containers
Libnetwork provides a native Go implementation for connecting containers
The goal of libnetwork is to deliver a robust Container Network Model that provides a consistent programming interface and the required network abstractions for applications.
Design
Please refer to the design for more information.
Using libnetwork
There are many networking solutions available to suit a broad range of use-cases. libnetwork uses a driver / plugin model to support all of these solutions while abstracting the complexity of the driver implementations by exposing a simple and consistent Network Model to users.
Contributing
Want to hack on libnetwork? Docker's contributions guidelines apply.
Copyright and license
Code and documentation copyright 2015 Docker, inc. Code released under the Apache 2.0 license. Docs released under Creative commons.