Here, we talk about the various components within a Kubernetes architecture. Read further to know more!
Kubernetes is an open-source container orchestration platform used for running distributed applications and services at scale. Merely knowing the basics of Kubernetes won’t be sufficient enough in order to leverage the many advantages that it offers.
It’s important to first understand the complete Kubernetes architecture, its components and how they interact with each other to know how Kubernetes actually works. Let’s take a brief look and explore how the different components of Kubernetes work together.
Kubernetes is the ideal solution for complete orchestration, scaling and deployment of containerized applications. You can also read about application containerization, Kubernetes API, Kubernetes API Gateway and much more here!
- The What, Why, and How of Application Containerization!
- What is Kubernetes API?
This blog outlines the various components within a Kubernetes architecture that are required for a complete and working Kubernetes cluster.
Here, we talk about,
- What is a Kubernetes Cluster?
- The Compute Machines or Nodes( Worker Nodes)
- The Control Plane(Master Node)
- Components of the Control Plane
- Node Components
Let’s dive in!
What is a Kubernetes Cluster?
A Kubernetes cluster is a set of nodes that runs containerized applications and workloads. A Kubernetes cluster has two parts:
- The Compute Machines or Nodes( Worker Nodes)
- The Control Plane( Master Node)
The Compute Machines or Worker Nodes
A node inside a Kubernetes cluster is a worker machine that can either be a virtual or a physical machine, depending on the cluster. Each node within the cluster is managed by the control plane and contains the services necessary to run Pods, which are made up of containers.
Wondering what are pods in Kubernetes? A pod is the smallest and simplest unit in the Kubernetes architecture model. It represents a set of running containers within the cluster.
Every cluster has at least one worker node. The worker node(s) are generally responsible for hosting the Pods. The Kubernetes control plane automatically controls and manages the scheduling of these pods across different nodes within the cluster, keeping into account the available resources on each Node.
The Control Plane or Master Node
The control plane (master node), in the Kubernetes architecture, is an important part of the Kubernetes cluster. It exposes the API and interfaces for deploying and managing the complete lifecycle of containers. It manages the worker nodes and the pods within the Kubernetes cluster.
The components of the control plane help in taking decisions about the cluster (like scheduling the pods), as well as identifying and responding to cluster events ( such as starting a new pod when the deployment's replicas field is unsatisfied).
Here's the Kubernetes architecture diagram with all the components tied together.
Components of the Control Plane
Let’s talk about the most crucial part of the Kubernetes cluster: the control plane. The control plane contains the core Kubernetes components that are responsible for controlling the complete Kubernetes cluster along with data that specifies the cluster’s state and configuration. Here, we’ll talk about the components of the control plane.
With the help of these K8s components, the Control Plane controls and responds to cluster events and makes sure that the containers within the K8s cluster are running in sufficient numbers and with the necessary resources.
Some types of these controllers are,
In simpler words, cloud-controller-manager only runs controllers that are specific to the cloud provider which is being used. This Kubernetes architecture diagram shows how different parts of a Kubernetes cluster are related to each other.
By looking at the Kubernetes architecture explanation, we can clearly see that Kubernetes runs the workload by placing containers into Pods to run on Nodes. After knowing in detail about what are Pods in Kubernetes, let’s now look at the components of a node or compute machine.
Here’s a brief description of the node components. So, let’s take a look,
Wrapping it all!
This was a complete Kubernetes architecture explanation. I hope it gives a clear picture of how Kubernetes works. Along with all the incredible advantages that come up with deploying Kubernetes, there are challenges too. A powerful and reliable Kubernetes & Microservices management platform such as BuildPiper can help overcome these complex Kubernetes challenges and allow enterprises to extract the most out of their investments.
Also published here.