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CNI - Container Network Interface

RFCs for K8s Networking

/etc/cni/net.d

Check the /etc/cni/net.d directory for configuration about CNI

Bridge​

Bridge is a plugin for the CNI. Bridge takes care of all the aspects of connecting a container to a namespace.

bridge add {containerId} {nameSpace:/var/run/netns/{nameSpaceId}}
  • Creates the bridge network if needed
  • Creates the veth pairs
  • Attaches VETHs to namespaces and to the bridge
  • Assigns an IP address
  • Brings up interface
  • Enables NAT

The plugin is invoked at add/delete of containers.