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CNM refers to Container Networking Model. The Container Network Model (CNM) is a standard or specification from Docker, Inc. that forms the basis of container networking in a Docker environment.It is Docker’s approach to providing container networking with support for multiple network drivers. 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
The major components of the CNM are:
- Network,
- Sandbox and
- Endpoint. Sandbox is a generic term that refers to OS specific technologies used to isolate networks stacks on a Docker host. Docker on Linux uses kernel namespaces to provide this sandbox functionality. Networks “stacks” inside of sandboxes include interfaces, routing tables, DNS etc. A network in CNM terms is one or more endpoints that can communicate.All endpoints on the same network can communicate with each other.Endpoints on different networks cannot communicate without external routing.
Итог
Key takeaway for interview: What does CNM refers to? What are its components?