What is Kubernetes network plugin?

Network plugins in Kubernetes come in a few flavors: CNI plugins: adhere to the Container Network Interface (CNI) specification, designed for interoperability. Kubernetes follows the v0. 4.0 release of the CNI specification.

What is CNI network plugin?

A CNI plugin is responsible for inserting a network interface into the container network namespace (e.g., one end of a virtual ethernet (veth) pair) and making any necessary changes on the host (e.g., attaching the other end of the veth into a bridge).

What is a CNI in k8s?

CNI (Container Network Interface), a Cloud Native Computing Foundation project, consists of a specification and libraries for writing plugins to configure network interfaces in Linux containers, along with a number of plugins. Kubernetes uses CNI as an interface between network providers and Kubernetes pod networking.

What is the best CNI?

Calico: Clear Winner Among All Tested CNIs In fact, Calico is the CNI of choice in the primary use cases presented by the author in the report’s summary. The exceptional performance of Calico encryption was described as having the “real wow effect” among all of the CNI comparisons.

Why is CNI needed?

If you are working on latency-sensitive applications, the AWS-CNI plugin allows accepting traffic directly to your pods. AWS-CNI plugin creates a virtual network interface on the host instance and creates a network route directly to the pods. This property can help decrease the network latency.

Which networking model is used by Kubernetes?

Kubernetes follows an “IP-per-pod” model where each pod get assigned an IP address and all containers in a single pod share the same network namespaces and IP address. Containers in the same pod can therefore reach each other’s ports via localhost: .

What CNI does EKS use?

Amazon VPC Container Network Interface
Amazon EKS supports native VPC networking with the Amazon VPC Container Network Interface (CNI) plugin for Kubernetes. Using this plugin allows Kubernetes pods to have the same IP address inside the pod as they do on the VPC network. For more information, see Pod networking (CNI).

Does Docker use CNI?

Docker, the company behind the Docker container runtime, came up with the Container Network Model (CNM). Around the same time, CoreOS, the company responsible for creating the rkt container runtime, came up with the Container Network Interface (CNI).

Is flannel a CNI?

Flannel, a project developed by the CoreOS, is perhaps the most straightforward and popular CNI plugin available. It is one of the most mature examples of networking fabric for container orchestration systems, intended to allow for better inter-container and inter-host networking.

What is the most basic Kubernetes object?

A pod is the most basic unit of the Kubernetes cluster. It usually contains one or more running containers. Pods are designed to be ephemeral in nature which means that they can be destroyed at any time. Containers in a pod share the same network, storage, and lifecycle.

What is Kubernetes flannel?

Flannel is an open-source virtual network project managed by CoreOS network designed for Kubernetes. Each host in a flannel cluster runs an agent called flanneld . It assigns each host a subnet, which acts as the IP address pool for containers running on the host.

Does EKS need NAT gateway?

All nodes can optionally send and receive internet traffic through a NAT instance or NAT gateway. You must bypass the EKS cluster introspection by providing the cluster certificate authority and cluster API endpoint to the nodes. You also may need to configure VPC endpoints listed in Modifying cluster endpoint access.

What is the plug-in architecture?

The plug-in architecture consists of two components: a core system and plug-in modules. The main key design here is to allow adding additional features as plugins to the core application, providing extensibility, flexibility, and isolation of application features and customs processing logic.

What is the difference between –network-plugin=kubenet and -network- plugin-MTU=9001?

–network-plugin=kubenet specifies that we use the kubenet network plugin with CNI bridge, lo and host-local plugins placed in /opt/cni/bin or cni-bin-dir. –network-plugin-mtu=9001 specifies the MTU to use, currently only used by the kubenet network plugin.

Does network-plugin-MTU support CNI plugin?

This option is provided to the network-plugin; currently only kubenet supports network-plugin-mtu. –network-plugin=cni specifies that we use the cni network plugin with actual CNI plugin binaries located in –cni-bin-dir (default /opt/cni/bin) and CNI plugin configuration located in –cni-conf-dir (default /etc/cni/net.d ).

Which network plugin to use from CNI-bin-Dir?

network-plugin: The network plugin to use from cni-bin-dir. It must match the name reported by a plugin probed from the plugin directory. For CNI plugins, this is cni. Besides providing the NetworkPlugin interface to configure and clean up pod networking, the plugin may also need specific support for kube-proxy.