The Docker CNM model

The CNM provides the following contract between networks and containers:

  • All containers on the same network can communicate freely with each other
  • Multiple networks are the way to segment traffic between containers and should be supported by all drivers
  • Multiple endpoints per container are the way to join a container to multiple networks
  • An endpoint is added to a network sandbox to provide it with network connectivity

We will discuss the details of how CNM is implemented in Chapter 6, Next Generation Networking Stack for Docker: libnetwork.

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