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kubeweek-Day-1: Kubernetes Architecture

kubeweek-Day-1: Kubernetes Architecture

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ABHIJEET SINGH
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Table of contents

An Overview of Kubernetes Architecture and Container Deployment - Applied Information Sciences

  • etcd:

    Traefik, The Cloud Native Application Proxy | Traefik Labs

  • A distributed key-value store used by Kubernetes to store and manage cluster state. It ensures consistency and high availability of the stored data, making it an essential component for the reliable operation of Kubernetes.

  • API server:

    API =/= Database - DEV Community

  • The primary management point for Kubernetes, responsible for handling RESTful API requests and modifying the cluster state accordingly. It provides a way to manage the cluster and its resources through a simple and unified interface.

  • Controller manager:

  • A Kubernetes component is responsible for managing controllers that monitor and respond to changes in the cluster, ensuring that the desired state is maintained. It automates many tasks and makes it easier to manage the overall state of the cluster.

  • Scheduler: A Kubernetes component responsible for scheduling workloads onto available nodes in the cluster based on resource availability and other constraints. It helps to ensure that resources are used efficiently and that workloads are deployed to the most appropriate nodes.

  • Kubelet:

  • A component that runs on each node in the cluster and is responsible for managing containers and ensuring that they are running as expected. It communicates with the API server to receive instructions on how to manage the containers.

  • Service proxy: Responsible for managing network traffic between services in the cluster. It helps to ensure that services can communicate with each other efficiently and securely.

  • kubectl:

    Coders Classroom: Kubernetes for Developers #3: kubectl CLI

  • A command-line tool that allows users to interact with the Kubernetes API server to manage the cluster and its resources. It provides a way to perform various administrative tasks, such as creating, updating, and deleting resources in the cluster.

What is Control Plane?

The Control Plane is responsible for managing the overall state of the cluster, including the state of each individual node, the configuration of each application, and the overall health of the cluster. The API server is the primary interface for managing the Kubernetes cluster, and it exposes a RESTful API that can be accessed using tools like kubectl.

Role of the API server.

✔️ The API server is the primary management point for Kubernetes.

✔️ It handles RESTful API requests and modifies the cluster state accordingly.

✔️ It provides a simple and unified interface for managing the cluster and its resources.

✔️ It performs authentication, authorization, and validation checks on incoming requests.

✔️ It updates the cluster's internal state by modifying the etcd datastore