Kubernetes architecture

Kubernetes has something to offer for every IT role. Learn exactly how Kubernetes can help you meet application challenges—whether you’re in programming, administration, operations, or security. If you're new to Kubernetes and want to take a high-level look before jumping straight into the architectures below, check out “ Want to get some free, hands-on experience with Kubernetes? Take advantage of interactive, no-cost Kubernetes tutorials by checking out IBM CloudLabs. Here are four ways Kubernetes architecture can conform to specific IT roles and needs: 1. Kubernetes architecture for the programmer If you write source code and test applications, you likely think of the application code as separate from the server that it runs on. The code is checked into version control, the build executes, and then an automated process combines the two and creates a virtual environment. (Otherwise, you have to copy the application code by hand, then stop the server, and restart it, forcing the application into memory.) Challenges of traditional programming vs. cloud-native Moving between environments and reproducing production issues can cause serious programming delays. Programmers want easy pushes to production with limited downtime. Traditional programming approaches involve a single build written in one programming stack if the process is manual. This usually means changes only occur at night or over the weekend, which, in turn, means someone has to work the weekend and monitor in c...

Kubernetes – Cluster Architecture As can be seen in the diagram below, Kubernetes has a client-server architecture and has master and worker nodes, with the master being installed on a single Linux system and the nodes on many Linux workstations. Kubernetes Components Kubernetes is composed of a number of components, each of which plays a specific role in the overall system. These components can be divided into two categories: Control Plane Components It is basically a collection of various components that help us in managing the overall health of a cluster. For example, if you want to set up new pods, destroy pods, scale pods, etc. Basically, 4 services run on Control Plane: Kube-API server The API server is a component of the Kubernetes control plane that exposes the Kubernetes API. It is like an initial gateway to the cluster that listens to updates or queries via CLI like Kubectl. Kubectl communicates with API Server to inform what needs to be done like creating pods or deleting pods etc. It also works as a gatekeeper. It generally validates requests received and then forwards them to other processes. No request can be directly passed to the cluster, it has to be passed through the API Server. Kube-Scheduler When API Server receives a request for Scheduling Pods then the request is passed on to the Scheduler. It intelligently decides on which node to schedule the pod for better efficiency of the cluster. Kube-Controller-Manager The kube-controller-manager is responsibl...

Microservices are a popular architectural style for building applications that are resilient, highly scalable, independently deployable, and able to evolve quickly. But a successful microservices architecture requires a different approach to designing and building applications. A microservices architecture consists of a collection of small, autonomous services. Each service is self-contained and should implement a single business capability within a bounded context. A bounded context is a natural division within a business and provides an explicit boundary within which a domain model exists. What are microservices? • Microservices are small, independent, and loosely coupled. A single small team of developers can write and maintain a service. • Each service is a separate codebase, which can be managed by a small development team. • Services can be deployed independently. A team can update an existing service without rebuilding and redeploying the entire application. • Services are responsible for persisting their own data or external state. This differs from the traditional model, where a separate data layer handles data persistence. • Services communicate with each other by using well-defined APIs. Internal implementation details of each service are hidden from other services. • Supports polyglot programming. For example, services don't need to share the same technology stack, libraries, or frameworks. Besides for the services themselves, some other components appear in a ...

This reference architecture shows a microservices application deployed to Azure Kubernetes Service (AKS). It describes a basic AKS configuration that can be the starting point for most deployments. This article assumes basic knowledge of Kubernetes. The article focuses mainly on the infrastructure and DevOps considerations of running a microservices architecture on AKS. For guidance on how to design microservices, see A reference implementation of this architecture is available on Architecture Download a If you would prefer to see a more advanced microservices example that is built upon the Workflow The architecture consists of the following components. Azure Kubernetes Service (AKS). AKS is a managed Kubernetes cluster hosted in the Azure cloud. Azure manages the Kubernetes API service, and you only need to manage the agent nodes. Virtual network. By default, AKS creates a virtual network into which agent nodes are connected. You can create the virtual network first for more advanced scenarios, which lets you control things like subnet configuration, on-premises connectivity, and IP addressing. For more information, see Ingress. An ingress server exposes HTTP(S) routes to services inside the cluster. For more information, see the section Azure Load Balancer. After creating an AKS cluster, the cluster is ready to use the load balancer. Then, once the NGINX service is deployed, the load balancer will be configured with a new public IP that will front your ingress controller...

In this article: • • • • • • • • • • • • • • Kubernetes Architecture and Components Explained The Kubernetes architecture consists of various components that help manage clusters. A Kubernetes cluster is a group of machines, called nodes, that are used to run containerized applications. These nodes are managed by the Kubernetes platform, which provides a way to automate the deployment, scaling, and management of the applications. Pods are the basic units of deployment in Kubernetes. A pod is a group of one or more containers that are deployed together on the same node. Pods are used to host the applications that run on the cluster, and they provide a way to manage the containers as a single entity. Image Source: Control Plane Components The Kubernetes control plane is the central management point for the cluster, and it consists of a number of different components that work together to manage the cluster and ensure that the desired state of the system is maintained. kube-apiserver The kube-apiserver is the central management point for a Kubernetes cluster. It is one of the key components of the Kubernetes control plane, and it exposes the Kubernetes API, which is used by external clients to interact with the cluster. The kube-apiserver is responsible for coordinating the various components of the cluster, and it provides the mechanisms for enforcing policies and ensuring that the desired state of the cluster is maintained. It also provides an authentication and authorizati...

Kubernetes Containerisation has brought a lot of flexibility for developers in terms of managing the deployment of the applications. However, the more granular the application is, the more components it consists of and hence requires some sort of management for those. One still needs to take care of scheduling the deployment of a certain number of containers to a specific node, managing networking between the containers, following the resource allocation, moving them around as they grow and much more. Nearly all applications nowadays need to have answers for things like • Replication of components • Auto-scaling • Load balancing • Rolling updates • Logging across components • Monitoring and health checking • Service discovery • Authentication Google has given a combined solution for that which is Kubernetes, or how it’s shortly called – K8s. In this article, we will look into the moving parts of Kubernetes – what are the key elements, what are they responsible for and what is the typical usage of them. We will then have them all installed using the docker container provided as a playground by K8s team, and review the components deployed. Glossary Before we dive into setting up the components, you should get comfortable with some Kubernetes glossary. Pod Kubernetes targets the management of elastic applications that consist of multiple microservices communicating with each other. Often those microservices are tightly coupled forming a group of containers that would typicall...

Kubernetes has something to offer for every IT role. Learn exactly how Kubernetes can help you meet application challenges—whether you’re in programming, administration, operations, or security. If you're new to Kubernetes and want to take a high-level look before jumping straight into the architectures below, check out “ Want to get some free, hands-on experience with Kubernetes? Take advantage of interactive, no-cost Kubernetes tutorials by checking out IBM CloudLabs. Here are four ways Kubernetes architecture can conform to specific IT roles and needs: 1. Kubernetes architecture for the programmer If you write source code and test applications, you likely think of the application code as separate from the server that it runs on. The code is checked into version control, the build executes, and then an automated process combines the two and creates a virtual environment. (Otherwise, you have to copy the application code by hand, then stop the server, and restart it, forcing the application into memory.) Challenges of traditional programming vs. cloud-native Moving between environments and reproducing production issues can cause serious programming delays. Programmers want easy pushes to production with limited downtime. Traditional programming approaches involve a single build written in one programming stack if the process is manual. This usually means changes only occur at night or over the weekend, which, in turn, means someone has to work the weekend and monitor in c...

In this article: • • • • • • • • • • • • • • Kubernetes Architecture and Components Explained The Kubernetes architecture consists of various components that help manage clusters. A Kubernetes cluster is a group of machines, called nodes, that are used to run containerized applications. These nodes are managed by the Kubernetes platform, which provides a way to automate the deployment, scaling, and management of the applications. Pods are the basic units of deployment in Kubernetes. A pod is a group of one or more containers that are deployed together on the same node. Pods are used to host the applications that run on the cluster, and they provide a way to manage the containers as a single entity. Image Source: Control Plane Components The Kubernetes control plane is the central management point for the cluster, and it consists of a number of different components that work together to manage the cluster and ensure that the desired state of the system is maintained. kube-apiserver The kube-apiserver is the central management point for a Kubernetes cluster. It is one of the key components of the Kubernetes control plane, and it exposes the Kubernetes API, which is used by external clients to interact with the cluster. The kube-apiserver is responsible for coordinating the various components of the cluster, and it provides the mechanisms for enforcing policies and ensuring that the desired state of the cluster is maintained. It also provides an authentication and authorizati...

Microservices are a popular architectural style for building applications that are resilient, highly scalable, independently deployable, and able to evolve quickly. But a successful microservices architecture requires a different approach to designing and building applications. A microservices architecture consists of a collection of small, autonomous services. Each service is self-contained and should implement a single business capability within a bounded context. A bounded context is a natural division within a business and provides an explicit boundary within which a domain model exists. What are microservices? • Microservices are small, independent, and loosely coupled. A single small team of developers can write and maintain a service. • Each service is a separate codebase, which can be managed by a small development team. • Services can be deployed independently. A team can update an existing service without rebuilding and redeploying the entire application. • Services are responsible for persisting their own data or external state. This differs from the traditional model, where a separate data layer handles data persistence. • Services communicate with each other by using well-defined APIs. Internal implementation details of each service are hidden from other services. • Supports polyglot programming. For example, services don't need to share the same technology stack, libraries, or frameworks. Besides for the services themselves, some other components appear in a ...

• Courses • Summer Skill Up • • • Data Structures and Algorithms • • • • • • • For Working Professionals • • • • • • For Students • • • • • • • • Programming Languages • • • • Web Development • • • • • Machine Learning and Data Science • • • New Courses • • • • School Courses • • • • Tutorials • DSA • • • • • Data Structures • • • • Linked List • • • • • • • Tree • • • • • • • • • • • • • • • • Algorithms • Analysis of Algorithms • • • • • • • • • • • • • • Searching Algorithms • • • • Sorting Algorithms • • • • • • • • • • • • • • • • • • • • • • • • System Design • System Design Tutorial • • • • • • • • • • • • Software Design Patterns • • • • • • • • • • • Interview Corner • • • • • • • • • • Languages • • • • • • • • • • • • • Web Development • • • • • CSS Frameworks • • • • • • • • • • JavaScript Frameworks • • • • • • JavaScript Libraries • • • • • • • • • • • • • • • • • • • • • • School Learning • • • Mathematics • • • • • • • • • CBSE Syllabus • • • • • • Maths Notes (Class 8-12) • • • • • • Maths Formulas (Class 8 -11) • • • • • NCERT Solutions • • • • • • RD Sharma Solutions • • • • • • Science Notes • • • • Physics Notes (Class 8-12) • • • • • • Chemistry Notes (Class 8-12) • • • • • • Biology Notes • • • • • Social Science Syllabus • • • • • Social Science Notes • SS Notes (Class 7-12) • • • • • CBSE History Notes (Class 7-10) • • • • CBSE Geography Notes (Class 7-10) • • • • CBSE Civics Notes (Class 7-10) • • • Commerce • • • • • • • CBSE Previous Year Papers...