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Accessing an Application via Pod IP We can reach the deployed website using the Pod IP, but first we need to know that address. The -o wide flag with kubectl get shows extra details, including the Pod IP: kubectl get pods -l app=my-app -o wide If the network path is open, we can access our application from any node in the cluster: curl --head ...

What is Graceful Service Deregistration in SpringCloud? Java applications running on JVM may crash unexpectedly due to OOM, forced termination by users, or other business exceptions. When upgrading services, graceful deregistration becomes essential. Is kill PID considered a graceful shutdown strategy? No. Graceful shutdown is a goal, not a met ...

Kubernetes distinguishes between stateless and stateful workloads. Stateless components can be replaced at any time without data loss, whereas stateful systems—such as databases and distributed key-value stores—depend on node identity, local persistence, and startup order. While Custom Resource Definitions and Operators extend Kubernetes for do ...

Step Description Prepare ARM-based hardware Provision compatible ARM architecture infrastructure Install base operating system Deploy a supported ARM-compatible operating system Install Docker container runtime Set up the required container runtime for Kubernetes Install Kubernetes core components Install kubelet, kubeadm, and kube ...

Projected Volumes in Kubernetes Kubernetes introduces a category of volumes that don't serve traditional data storage purposes. Instead, these Projected Volumes inject predefined data directly into containers at runtime. The Kubernetes documentation defines four types of Projected Volumes: Secret, ConfigMap, Downward API, and ServiceAccountToke ...

etcd serves as the cirtical distributed key-value store for Kubernetes, holding cluster state and configuration data. Regular backups are essential for disaster recovery and cluster migration. This guide outlines a complete procedure for backing up and restoring an etcd cluster using etcdctl, assuming a three-node HA setup deployed via kubeadm. ...

Monitoring Workflow for Non-Native ApplicationsPrometheus integration generally falls into two categories: applications that expose native metrics endpoints and those that do not. For legacy applications or services lacking a built-in /metrics interface, monitoring requires an intermediate component. The standard workflow involves the following ...

Symptom In a Kubernetes cluster, CoreDNS is used to provide internal DNS services. However, during operation, occasional failures in resolving public domain names were observed. Application logs recorded UnknownHost errors. Root Cause Analysis Network packet capture was performed on the problematic cluster. When DNS resolution failures were log ...

High-Availability Architecture Kubernetes Cluster Components etcd kube-apiserver kube-scheduler kube-controller-manager kubelet kube-proxy kubectl High-Availability Analysis Load Balancer Node Design Environment Preparation Environment Planning Host Resolution Configuration Required Tools Installation System Services Configuraton SSH Key S ...

The Kubernetes platform orchestrates containerized workloads across a cluster of machines. Before diving into operational details, understanding a few common workload abstractions is essential. Pods The Pod serves as the fundamental deployable unit. It encapsulates one or more containers that share network and storage resources, co-located on t ...