Core concepts Cluster Architecture Master node: orchestrate nodes → schedule, monitor, worker, state, manage cluster Worker node: host applications as container Master node components: ETCD: database of the state of the cluster KUBE-SCHEDULER: schedule pods to worker nodes CONTROLLER-MANAGER NODE-CONTROLLER: orchestrate nodes REPLICATION-CONTROLLER: orchestrate replication groups KUBE-APISERVER: expose k8s cluster from external thought api Worker node components: CONTAINER RUNTIME: container runtime engine KUBELET: agent that run in every node, for receive api call from api server KUBE-PROXY: manage communication between container, nodes Container runtime interface Container runtime interface CRI: allow to use k8s with all container runtime ...

Jenkins pipelines running on Kubernetes offer powerful customization using pod templates. In this post, you’ll learn how to define a custom Kubernetes agent pod in a YAML template located in a different Git repository, and then use that in your Jenkins pipeline. 🧱 Requirements Jenkins with the Kubernetes plugin A Git repo hosting your custom pod template YAML Access to a Kubernetes cluster (like EKS, GKE, or Minikube) Git credentials stored in Jenkins (e.g., via credentialsId) 📁 Repository Structure We assume you have two Git repositories: ...

Introduction Passing the Kubernetes and Cloud Native Associate (KCNA) exam was a great milestone in my cloud journey. In this post, I’ll walk you through the strategy I used to prepare and pass the exam on the first attempt. I focused on hands-on experience, curated courses, and repeated quiz practice to reinforce core concepts. Why KCNA? KCNA is a foundational certification offered by the Cloud Native Computing Foundation (CNCF). It’s designed to validate your understanding of Kubernetes, cloud-native principles, container orchestration, and open-source tools in the CNCF landscape. ...

KCNA Kubernetes architecture Simple definitions Node: node is a worker machine where container run Cluster: set of node Master node: orchestrate the nodes Components Api server: frontend of the architecture. With api server you can talk with the cluster etcd: Distributed Hash Table **(**DHT) that contains all info of the cluster kubelet: agent that run in all node. Run stop container, interact with the kube api server of the master. container runtime: runtime where containers run controller: control the state of the cluster, restart pods if fails scheduler: distribute works on the nodes Kubectl CLI command for talk with the cluster ...

Introduction In this post, I’ll share how I passed the Terraform Associate certification (HashiCorp Certified: Terraform Associate 003) with a combination of free and paid resources, hands-on labs, and some tips I wish I knew earlier. If you’re preparing for this cert, I hope my experience helps streamline your path. Why Terraform? As someone passionate about DevOps and cloud infrastructure, learning Terraform felt like a natural next step. It’s declarative, cloud-agnostic, and widely adopted in production environments. Earning the certification helped validate my skills and gave me more confidence when building infrastructure as code (IaC) for personal and professional projects. ...