Multus CNI is a container network interface (CNI) plugin for Kubernetes that enables attaching multiple network interfaces to pods. Typically, in Kubernetes each pod only has one network interface (apart from a loopback) -- with Multus you can create a multi-homed pod that has multiple interfaces.
Multus CNI (Container Network Interface) is a novel approach to managing multiple CNIs in your container network (Kubernetes). Based on its name, which means _multiple _in Latin, Multus is an open-source plug-in, which serves as an additional layer in a container network, to enable multi-interface support.
For example, Virtual Network Functions (VNFs) often depend on connectivity towards multiple network interfaces.
The CNI project itself, backed by the Cloud Native Computing Foundation, defines a minimum specification on what a common interface should look like. The CNI project consists of three primary components:
Each CNI can deliver different results, which makes Multus a wonderful plugin to manage these functionalities and make them work together.
Multus delivers this functionality in form of a contact between the container runtime and a selection of plugins, which are called upon to do the actual net configuration tasks.
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