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https://github.com/containernetworking/cni

Container Network Interface - networking for Linux containers
https://github.com/containernetworking/cni

containers docker kubernetes networking

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Container Network Interface - networking for Linux containers

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README 

        
![CNI Logo](logo.png)



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# CNI - the Container Network Interface



[![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/2446/badge)](https://bestpractices.coreinfrastructure.org/projects/2446)

[![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/containernetworking/cni/badge)](https://securityscorecards.dev/viewer/?uri=github.com/containernetworking/cni)



## What is CNI?



CNI (_Container Network Interface_), a [Cloud Native Computing Foundation](https://cncf.io) project, consists of a specification and libraries for writing plugins to configure network interfaces in Linux containers, along with a number of supported plugins.

CNI concerns itself only with network connectivity of containers and removing allocated resources when the container is deleted.

Because of this focus, CNI has a wide range of support and the specification is simple to implement.



As well as the [specification](SPEC.md), this repository contains the Go source code of a [library for integrating CNI into applications](libcni) and an [example command-line tool](cnitool) for executing CNI plugins.  A [separate repository contains reference plugins](https://github.com/containernetworking/plugins) and a template for making new plugins.



The template code makes it straight-forward to create a CNI plugin for an existing container networking project.

CNI also makes a good framework for creating a new container networking project from scratch.



Here are the recordings of two sessions that the CNI maintainers hosted at KubeCon/CloudNativeCon 2019:



- [Introduction to CNI](https://youtu.be/YjjrQiJOyME)

- [CNI deep dive](https://youtu.be/zChkx-AB5Xc)



## Contributing to CNI



We welcome contributions, including [bug reports](https://github.com/containernetworking/cni/issues), and code and documentation improvements.

If you intend to contribute to code or documentation, please read [CONTRIBUTING.md](CONTRIBUTING.md). Also see the [contact section](#contact) in this README.



The CNI project has a [weekly meeting](https://meet.jit.si/CNIMaintainersMeeting). It takes place Mondays at 11:00 US/Eastern. All are welcome to join.



## Why develop CNI?



Application containers on Linux are a rapidly evolving area, and within this area networking is not well addressed as it is highly environment-specific.

We believe that many container runtimes and orchestrators will seek to solve the same problem of making the network layer pluggable.



To avoid duplication, we think it is prudent to define a common interface between the network plugins and container execution: hence we put forward this specification, along with libraries for Go and a set of plugins.



## Who is using CNI?

### Container runtimes

- [rkt - container engine](https://coreos.com/blog/rkt-cni-networking.html)

- [Kubernetes - a system to simplify container operations](https://kubernetes.io/docs/concepts/extend-kubernetes/compute-storage-net/network-plugins/)

- [OpenShift - Kubernetes with additional enterprise features](https://github.com/openshift/origin/blob/master/docs/openshift_networking_requirements.md)

- [Cloud Foundry - a platform for cloud applications](https://github.com/cloudfoundry-incubator/cf-networking-release)

- [Apache Mesos - a distributed systems kernel](https://github.com/apache/mesos/blob/master/docs/cni.md)

- [Amazon ECS - a highly scalable, high performance container management service](https://aws.amazon.com/ecs/)

- [Singularity - container platform optimized for HPC, EPC, and AI](https://github.com/sylabs/singularity)

- [OpenSVC - orchestrator for legacy and containerized application stacks](https://docs.opensvc.com/latest/fr/agent.configure.cni.html)



### 3rd party plugins

- [Project Calico - a layer 3 virtual network](https://github.com/projectcalico/calico)

- [Weave - a multi-host Docker network](https://github.com/weaveworks/weave)

- [Contiv Networking - policy networking for various use cases](https://github.com/contiv/netplugin)

- [SR-IOV](https://github.com/hustcat/sriov-cni)

- [Cilium - BPF & XDP for containers](https://github.com/cilium/cilium)

- [Infoblox - enterprise IP address management for containers](https://github.com/infobloxopen/cni-infoblox)

- [Multus - a Multi plugin](https://github.com/k8snetworkplumbingwg/multus-cni)

- [Romana - Layer 3 CNI plugin supporting network policy for Kubernetes](https://github.com/romana/kube)

- [CNI-Genie - generic CNI network plugin](https://github.com/Huawei-PaaS/CNI-Genie)

- [Nuage CNI - Nuage Networks SDN plugin for network policy kubernetes support ](https://github.com/nuagenetworks/nuage-cni)

- [Silk - a CNI plugin designed for Cloud Foundry](https://github.com/cloudfoundry-incubator/silk)

- [Linen - a CNI plugin designed for overlay networks with Open vSwitch and fit in SDN/OpenFlow network environment](https://github.com/John-Lin/linen-cni)

- [Vhostuser - a Dataplane network plugin - Supports OVS-DPDK & VPP](https://github.com/intel/vhost-user-net-plugin)

- [Amazon ECS CNI Plugins - a collection of CNI Plugins to configure containers with Amazon EC2 elastic network interfaces (ENIs)](https://github.com/aws/amazon-ecs-cni-plugins)

- [Bonding CNI - a Link aggregating plugin to address failover and high availability network](https://github.com/Intel-Corp/bond-cni)

- [ovn-kubernetes - an container network plugin built on Open vSwitch (OVS) and Open Virtual Networking (OVN) with support for both Linux and Windows](https://github.com/openvswitch/ovn-kubernetes)

- [Juniper Contrail](https://www.juniper.net/cloud) / [TungstenFabric](https://tungstenfabric.io) -  Provides overlay SDN solution, delivering multicloud networking, hybrid cloud networking, simultaneous overlay-underlay support, network policy enforcement, network isolation, service chaining and flexible load balancing

- [Knitter - a CNI plugin supporting multiple networking for Kubernetes](https://github.com/ZTE/Knitter)

- [DANM - a CNI-compliant networking solution for TelCo workloads running on Kubernetes](https://github.com/nokia/danm)

- [VMware NSX – a CNI plugin that enables automated NSX L2/L3 networking and L4/L7 Load Balancing; network isolation at the pod, node, and cluster level; and zero-trust security policy for your Kubernetes cluster.](https://docs.vmware.com/en/VMware-NSX-T/2.2/com.vmware.nsxt.ncp_kubernetes.doc/GUID-6AFA724E-BB62-4693-B95C-321E8DDEA7E1.html)

- [cni-route-override - a meta CNI plugin that override route information](https://github.com/redhat-nfvpe/cni-route-override)

- [Terway - a collection of CNI Plugins based on alibaba cloud VPC/ECS network product](https://github.com/AliyunContainerService/terway)

- [Cisco ACI CNI - for on-prem and cloud container networking with consistent policy and security model.](https://github.com/noironetworks/aci-containers)

- [Kube-OVN - a CNI plugin that bases on OVN/OVS and provides advanced features like subnet, static ip, ACL, QoS, etc.](https://github.com/kubeovn/kube-ovn)

- [Project Antrea - an Open vSwitch k8s CNI](https://github.com/vmware-tanzu/antrea)

- [OVN4NFV-K8S-Plugin - a OVN based CNI controller plugin to provide cloud native based Service function chaining (SFC), Multiple OVN overlay networking](https://github.com/opnfv/ovn4nfv-k8s-plugin)

- [Azure CNI - a CNI plugin that natively extends Azure Virtual Networks to containers](https://github.com/Azure/azure-container-networking)

- [Hybridnet - a CNI plugin designed for hybrid clouds which provides both overlay and underlay networking for containers in one or more clusters. Overlay and underlay containers can run on the same node and have cluster-wide bidirectional network connectivity.](https://github.com/alibaba/hybridnet)

- [Spiderpool - An IP Address Management (IPAM) CNI plugin of Kubernetes for managing static ip for underlay network](https://github.com/spidernet-io/spiderpool)

- [AWS VPC CNI - Networking plugin for pod networking in Kubernetes using Elastic Network Interfaces on AWS](https://github.com/aws/amazon-vpc-cni-k8s)



The CNI team also maintains some [core plugins in a separate repository](https://github.com/containernetworking/plugins).



## How do I use CNI?



### Requirements



The CNI spec is language agnostic.  To use the Go language libraries in this repository, you'll need a recent version of Go.  You can find the Go versions covered by our [automated tests](https://travis-ci.org/containernetworking/cni/builds) in [.travis.yaml](.travis.yml).



### Reference Plugins



The CNI project maintains a set of [reference plugins](https://github.com/containernetworking/plugins) that implement the CNI specification.

NOTE: the reference plugins used to live in this repository but have been split out into a [separate repository](https://github.com/containernetworking/plugins) as of May 2017.



### Running the plugins



After building and installing the [reference plugins](https://github.com/containernetworking/plugins), you can use the `priv-net-run.sh` and `docker-run.sh` scripts in the `scripts/` directory to exercise the plugins.



**note - priv-net-run.sh depends on `jq`**



Start out by creating a netconf file to describe a network:



```bash

$ mkdir -p /etc/cni/net.d

$ cat >/etc/cni/net.d/10-mynet.conf </etc/cni/net.d/99-loopback.conf <