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Networking

Introduction

Networking is a crucial component of any application stack. In Kubernetes, networking can help with communication between containers, services, and nodes. In this presentation, we'll cover networking techniques, management, and networking architecture in Kubernetes.

Basic Networking Techniques

  • IP addressing is used to uniquely identify each device on the network.
  • Subnetting is used to create a virtual network overlay that spans across multiple nodes.
  • Routing is used to direct network traffic between devices on the network.
  • In Kubernetes, basic networking techniques are used to create a network overlay that allows for seamless communication between containers and services.
  • Kubernetes supports two networking models: host-based networking and container-based networking.
  • Host-based networking uses the host network interface to connect containers.
  • Container-based networking uses a virtual network overlay to connect containers.
  • Container-based networking provides better isolation between containers and allows for more flexibility in network configuration.
  • Kubernetes' software-defined network allows for dynamic routing of network traffic.
  • Basic networking techniques and concepts are critical to enabling communication between containers, services, and nodes in Kubernetes.

Kubernetes Networking Architecture

Kubernetes uses a networking architecture that allows for seamless communication between containers, services, and nodes. Kubernetes uses a virtual network overlay that spans across multiple nodes and allows for seamless communication between containers.

Kubernetes Networking Models

Kubernetes supports two networking models: host-based networking and container-based networking. Host-based networking uses the host network interface to connect containers, while container-based networking uses a virtual network overlay to connect containers.

Networking in Pods

Pods are the smallest deployable unit in Kubernetes and are responsible for running containers. Each pod has its own IP address and can communicate with other pods and services within the same cluster.

Networking in Services

Services are used to expose pods to other services within the cluster or to the outside world. Each service has its own IP address and can be accessed using a DNS name.

Networking in Ingress

Ingress is a Kubernetes object that allows for external access to services within the cluster. Ingress acts as a reverse proxy and can route traffic based on rules defined in the Ingress object.

Kubernetes Networking Plugins

Kubernetes supports multiple networking plugins that can be used to implement networking in the cluster. CNI (Container Network Interface) is a popular networking plugin that allows for seamless communication between containers.

Networking using CNI

CNI is a popular networking plugin that allows for seamless communication between containers. CNI supports multiple network overlays, including Calico, Flannel, and Weave.

Networking using Calico

Calico is a popular network overlay that can be used with CNI. Calico provides network policy enforcement and allows for seamless communication between pods and services.

Networking using Flannel

Flannel is a popular network overlay that can be used with CNI. Flannel provides network connectivity and allows for seamless communication between pods and services.

Networking using Weave

Weave is a popular network overlay that can be used with CNI. Weave provides network connectivity and allows for seamless communication between pods and services.

Networking Policies in Kubernetes

Kubernetes supports network policies that can be used to enforce rules on network traffic. Network policies can be used to allow or deny traffic between pods or services.

Managing Networking in Kubernetes

Managing networking in Kubernetes involves configuring networking plugins, creating services, and defining network policies. Kubernetes provides a set of commands and API objects that can be used to manage networking in the cluster.

Network Troubleshooting in Kubernetes

Troubleshooting networking issues in Kubernetes involves identifying the root cause of the issue and then taking appropriate action. Kubernetes provides a set of tools and commands that can be used to troubleshoot networking issues.

Kubernetes Networking Best Practices

Kubernetes networking best practices include using a network overlay, implementing network policies, and using service meshes. Service meshes such as Istio and Linkerd can be used to implement advanced networking features such as traffic management and security.