TECHNOLOGY-TO-THE-POINT (T3P)

  Kubectl Command Cheat Sheet Syntax Basic syntax:   kubectl [command] [TYPE] [NAME] [flags] COMMAND DESCRIPTION kubectl --help Display the command usage and list most common options kubectl <command> --help Display the command usage and list all available options kubectl explain <resource> Get documentation of resources Cluster & Context Management COMMAND DESCRIPTION kubectl config view Display merged kubeconfig settings kubectl config current-context Display the current context kubectl config use-context <context> Set the default context kubectl config set-context <context> Set a context entry in kubeconfig kubectl config get-contexts List all available contexts kubectl cluster-info Display cluster information Resource Management COMMAND DESCRIPTION kubectl get <resource> List resources kubectl get <resource> -o wide List resources with more details kubectl get <resource> -o yaml List resources in YAML format kubectl get <res...

 

Let's break this down (Step by Step) Containerization: First, each microservice is packaged into a container (usually Docker). Example: Let's say we have a simple e-commerce application with three microservices: Product Catalog Service Order Service User Authentication Service Each of these would be containerized separately.

In this blog, we are going to cover Kubernetes Core services for beginners that help build, deploy, and scale containerized applications across different environments. You will learn these services in detail, which are key components for managing clusters in Kubernetes.

In this quick Post you learn, How to Start Learning Core DevOps as a Beginner & Make a Career as a DevOps Engineer 👇 👉 What is Kubernetes? Kubernetes is an open-source container orchestration platform designed to automate the deployment, scaling, and management of containerized applications. It provides a framework for running distributed systems reliably, enabling teams to manage clusters of containers across multiple hosts and automate operational tasks. 👉  How Kubernetes Helps in Real-Time?

Here are 13 of the most commonly used kubectl commands for managing a real production Kubernetes environment, along with explanations and common use cases: ✅Core Management #1 kubectl get (Lists Kubernetes resources.) Include: → kubectl get pods (list pods) → kubectl get deployments (list deployments) → kubectl get services (list services) → kubectl get all (list most resources in a namespace) #2 kubectl describe (Provides detailed information about a resource.) Include: → kubectl describe pod my-pod → kubectl describe node my-node #3 kubectl create (Creates resources from files or standard input. Often used with YAML manifest files) → kubectl create -f my-deployment.yaml #4 kubectl apply (Creates or updates resources based on a configuration file. The safer way to manage changes in production as it keeps track of applied changes.) → kubectl apply -f my-deployment.yaml (apply a deployment definition) #5 kubectl delete (Deletes resources. Use with caution! ) → kubectl delete pod my-pod...

Foundational Concepts 1. Kubernetes Architecture Deep-Dive: Manually install a small Kubernetes cluster (Minikube or Kind are good options). Dissect the components: kube-apiserver, kube-scheduler, kube-controller-manager, etcd, kubelet, kube-proxy. Explore how they interact during pod creation, scheduling, etc. 2. YAML Manifests Mastery: Create pods, deployments, services, and other core resources entirely by writing YAML manifests. Avoid using kubectl create initially. Configure resource requests and limits. Understand different service types ( ClusterIP, NodePort, LoadBalancer ). 3. Networking Exploration: Set up pod-to-pod communication within the cluster. Practice exposing pods to the external world using services. Explore Ingress objects for more complex traffic routing. Imperative Commands & Troubleshooting 4. kubectl Proficiency: Practice imperative commands: kubectl get, describe, create, apply, delete, explain (for in-depth object descriptions). Master log retrieval: kub...

In today's DevOps world, understanding Kubernetes is an essential skill. With rising containerization, Kubernetes has become a must-have expertise for DevOps engineers, offering lucrative compensation. In this blog post, we will take a deep dive into Kubernetes, covering key concepts, best practices, and real-world examples. Mastering 'kubectl apply' Command The 'kubectl apply' command is a vital tool for deploying Kubernetes resources based on manifest files. Before applying the manifest, it's essential to verify file availability, permissions, and content. Running 'kubectl apply' ensures the desired resources are created. Let's explore this command with practical examples and understand its importance. Streamlining Kubernetes with Amazon EKS Transitioning to Amazon Elastic Kubernetes Service (EKS) offers numerous advantages, reducing operational overhead and simplifying updates and upgrades. AWS manages the Kubernetes control plane, including maste...

 

Q1. What is Kubernetes? Answer: Kubernetes is an open source container orchestration system that helps users to manage and automate the deployment, scaling, and operations of containerized applications. Q2. What is a container? Answer: A container is a standard unit of software that packages up code and all its dependencies so the application runs quickly and reliably from one computing environment to another. Q3. What are the benefits of using Kubernetes? Answer: Kubernetes provides a unified platform for deploying and managing applications, which makes it easier to scale, manage, and deploy applications. It also provides a unified platform for managing multiple clusters, and provides a consistent way to deploy and manage applications across different environments. Q4: How does Kubernetes work? Answer: Kubernetes works by managing a cluster of nodes, which are physical or virtual machines that are running a container runtime. It then uses a set of APIs to orchestrate and manage the co...