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This article answers ten common Kubernetes questions, covering pod scheduling strategies, OOM behavior, dynamic ConfigMap updates, pod stability, ClusterIP service load balancing, log collection, liveness probes, scaling mechanisms, exec access, and troubleshooting container restarts, providing concise explanations for each scenario.
This article provides an overview of Kubernetes storage options, describing temporary and persistent volume types such as EmptyDir, HostPath, ConfigMap, Secret, PersistentVolume, PersistentVolumeClaim, StorageClass, and NFS, and includes practical YAML examples for creating and using each storage solution in a cluster.
This article provides a step‑by‑step tutorial on preparing hardware, installing Docker, downloading and configuring Kubernetes, deploying the control plane and workloads, managing clusters, and detailed hands‑on examples for ConfigMaps, Jobs, Deployments, StatefulSets, and common applications such as Flask, MySQL, Redis, GitLab, and Jenkins, all illustrated with ready‑to‑use YAML and kubectl commands.
This article outlines typical Kubernetes pod failure states such as ContainerCreating, ErrImagePull, Pending, CrashLoopBackOff, and UnexpectedAdmissionError, explains their common causes—including Docker service problems, storage mount errors, ConfigMap misconfigurations, and image issues—and provides practical troubleshooting steps and example manifests.
Learn how to diagnose and resolve frequent Kubernetes pod status issues such as ContainerCreating, ErrImagePull, Pending, CrashLoopBackOff, and UnexpectedAdmissionError by examining Docker services, storage mounts, ConfigMaps, image repositories, and node resources, with practical examples and command‑line solutions.
This article outlines comprehensive best‑practice guidelines for building Kubernetes applications, covering scalability design, containerization, pod scope, configuration management, health probes, deployments, service discovery, storage, monitoring, security, and CI/CD integration to achieve robust, highly available workloads.
This article explains how to create and customize Helm charts by setting replica count ceilings, reusing logic with sub‑templates, and generating properly indented ConfigMaps using toYaml and indent functions, providing practical examples and command‑line snippets for Kubernetes deployments.
This article explains what a Kubernetes ConfigMap is, when to use it, and provides step‑by‑step instructions with YAML examples for creating a ConfigMap, mounting it in an Nginx deployment, and making the server_name parameter dynamic using pod metadata.
This article demonstrates how to achieve zero‑downtime releases for SpringBoot applications on Kubernetes by configuring readiness/liveness probes, rolling update strategies, graceful shutdown hooks, horizontal pod autoscaling, Prometheus monitoring, and externalized configuration via ConfigMaps.
This guide explains how to achieve zero‑downtime releases of a Spring Boot application on Kubernetes by configuring readiness/liveness probes, rolling‑update strategies, graceful shutdown, horizontal pod autoscaling, Prometheus metrics collection, and externalized configuration via ConfigMaps.
This guide explains how to create and manage Kubernetes Secrets and ConfigMaps, covering YAML and kubectl methods, different secret types, mounting techniques, environment variable injection, image pull secrets, and practical examples for secure configuration handling in cloud‑native environments.
This guide demonstrates how to deploy a MySQL cluster on Kubernetes using NFS persistent storage, ConfigMap for configuration, Service for access, and a StatefulSet to manage multiple replicas with init containers and volume claims.
This article explains how to effectively use static and dynamic environment variables in Kubernetes, including explicit definitions, implicit inclusion, Helm injection, and ConfigMap-based approaches, to streamline operations, reduce complexity, and improve microservice configuration and logging.
Learn how to configure kube-eventer to capture Kubernetes Warning and Normal events, use multiple webhook sinks and ConfigMaps to send detailed alerts to enterprise WeChat groups, tag responsible users, and customize request bodies for effective cluster monitoring and rapid issue resolution.
The article uses an aquarium metaphor to explain Kubernetes fundamentals—including Pods, Nodes, Scheduler, ReplicaSets, Services, Network Policies, and ConfigMaps—by comparing applications to fish, tanks to Pods, rooms to Nodes, and the control plane to the aquarium manager, making complex concepts easier to visualize.
This article explains how Istio injects sidecar containers into user‑space Pods using the istio‑sidecar‑injector component, covering automatic and manual injection methods, the underlying MutatingAdmissionWebhook configuration, the initContainer and sidecar containers added, and the associated ConfigMap and volume setups.