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Questions and Answers

What is the purpose of the Kubernetes network model?

  • To provide simplicity and consistency across a range of networking environments and network implementations (correct)
  • To make it easier to migrate applications from VMs and hosts to Pods
  • To provide isolation using network policies
  • To provide a unified entry address for a group of container applications

What is Cluster IP?

  • A CNI plugin for Kubernetes
  • A virtual IP network (correct)
  • A way to use multiple containers on a single machine
  • A way to control or monitor traffic between Pods and Services

What is Multus?

  • A CNI plugin for Kubernetes (correct)
  • A virtual IP network
  • A way to use multiple containers on a single machine
  • A way to control or monitor traffic between Pods and Services

What is the purpose of the device plugin?

<p>To provide SR-IOV support in Kubernetes through a CNI plugin (C)</p> Signup and view all the answers

What is the purpose of a service mesh?

<p>To control or monitor traffic between Pods and Services (D)</p> Signup and view all the answers

What is CNI?

<p>A networking library that enables containers on a host to attach to different networks (D)</p> Signup and view all the answers

What does SR-IOV CNI lack?

<p>Mechanism to expose the number of VFs available in a host (A)</p> Signup and view all the answers

What is the purpose of Intel technology in service mesh?

<p>To enable crypto acceleration through Intel Advanced Vector Extensions 512 (D)</p> Signup and view all the answers

What is the purpose of Envoy?

<p>To provide all optimizations natively available in Envoy (D)</p> Signup and view all the answers

What is the purpose of container networks?

<p>To use multiple containers on a single machine to improve performance (D)</p> Signup and view all the answers

Flashcards

Kubernetes Network Model

A system that offers simplicity and consistency for networking across diverse environments and implementations within Kubernetes. It simplifies managing pods and allows them to behave like VMs, enabling easy migration from VMs to Pods.

Pod Network Namespace

A virtual network space where containers within a pod share the same IP address and communicate as if they were running on the same machine. Pods act like VMs or hosts.

Network Policy

Kubernetes uses network policies to control traffic between pods and external networks. Different from configuring the network itself, it defines isolation rules.

Cluster IP

A virtual IP address within a Kubernetes cluster, used for Services. It offers a unified entry point for multiple pods performing the same function, distributing load.

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CNI (Container Network Interface)

A specification that allows containers to connect to different networks. It defines how containers can access the network within a host.

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Multus

A CNI plugin for Kubernetes that allows pods to connect to multiple networks. It extends the basic capabilities of CNI.

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SR-IOV (Single Root I/O Virtualization)

A technology that allows virtual machines to directly access network devices. It improves performance and resources allocation in cloud environments.

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Device Plugin

A feature that allows device drivers to communicate with Kubernetes, providing more fine-grained control over hardware resources like SR-IOV devices.

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Service Mesh

A dedicated layer that controls and monitors traffic between pods and services. It simplifies managing and optimizing network communication in large-scale container deployments.

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Envoy

A popular open-source service mesh that leverages Intel technologies like Advanced Vector Extensions 512 and Intel QuickAssist Technology for better security and performance.

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Study Notes

  • The Kubernetes network model provides simplicity and consistency across a range of networking environments and network implementations.
  • Pods can be treated much like VMs or hosts since they all have unique IP addresses.
  • Containers within Pods are like processes running within a VM or host--they run in the same network namespace and share an IP address.
  • This model makes it easier for applications to migrate from VMs and hosts to Pods managed by Kubernetes.
  • Because isolation is defined using network policies rather than the structure of the network, the network remains easy to understand.
  • Kubernetes supports mapping host ports through to Pods, or running Pods directly within the host network namespace sharing the host’s IP address.
  • The type of network a container uses is transparent from within the container, whether it is a bridge, an overlay, a MacvLan network, or a custom network plugin.
  • From the container’s point of view, it has a network interface with an IP address, gateway, routing table, DNS services, and other networking details, assuming the container is not using a non-network driver.
  • Kubernetes’ built-in network support, kubenet, provides some network connectivity.
  • Cluster IP is a virtual IP, which is actually a fake IP network.
  • Service can provide a unified entry address for a group of container applications with the same function and distribute the request load to each container application in the back-end.
  • Cluster IP only acts on the Kubernetes Service object and is managed and assigned IP addresses by Kubernetes from the Cluster IP address pool.
  • CNI is a networking library that enables containers on a host to attach to different networks.
  • Multus is a CNI plugin for Kubernetes that enables attaching multiple network interfaces to Pods.
  • This solution provides SR-IOV support in Kubernetes through a CNI plugin.
  • CNI lacks support for physical platform resource isolation.
  • The solution is to allow SR-IOV support in Kubernetes through a CNI plugin, which supports two modes of operation.
  • SR-IOV VFs are allocated to pod network namespace and are bounded to DPDK drivers in user space.
  • However, SR-IOV CNI has no mechanism to expose the number of VFs available in a host, and allocated network resources are not guaranteed from the same NUMA node.
  • To resolve these issues, the device plugin is used as shown in this diagram.
  • Container networks are a way to use multiple containers on a single machine to improve performance.
  • One way to use container networks is with CNI, which is a plugin designed to implement kernel-space networking.
  • Another way to use container networks is with a service mesh, which is a way to control or monitor traffic between Pods and Services.
  • One way to do this is with a service mesh container injected into every Kubernetes node.
  • Another way to do this is with a service mesh container injected into every Pod or sidecar.
  • With service mesh, Intel technology enables crypto acceleration through Intel Advanced Vector Extensions 512 and Intel QuickAssist Technology.
  • All optimizations are now natively available in Envoy. Developers using Envoy-based solutions will see benefits out of the box on Intel Xeon 3rd Gen Scalable Processor platforms and beyond.

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Test your knowledge of Kubernetes networking, container network models, CNI, and other related concepts with this quiz. Explore key features such as network policies, network support, service mesh, and performance optimizations.

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