Learn how to package each microservice into containers and host them on a Kubernetes cluster, covering architecture diagrams, Ingress traffic routing, service discovery, ConfigMap and Secret management, persistent storage, deployment manifests, autoscaling, and CI/CD automation, while avoiding promotional fluff.
This guide walks through why ConfigMap and Secret are essential in Kubernetes, explains their core concepts, shows multiple creation and usage methods, illustrates injection architectures, shares real‑world pitfalls, and provides production‑grade best practices and a final checklist.
This article explains the Kubernetes subPath feature, how it works under the Kubelet, and provides step‑by‑step examples for avoiding ConfigMap/Secret overwrites and achieving file isolation with PVCs, while highlighting practical tips and limitations for production use.
This guide explains how ConfigMap and Secret enable secure, decoupled configuration management in Kubernetes, covering their definitions, differences, best‑practice creation, usage in Pods, encryption at rest, dynamic updates, CI/CD integration, and essential command tips.
This guide walks you through the complete Kubernetes service deployment workflow, covering Docker image creation with multi‑stage builds, pushing to a registry, defining Deployment and Service resources, applying and monitoring them, managing configuration, implementing horizontal pod autoscaling, and integrating logging and monitoring solutions.
This guide demonstrates how to use the Fabric8 Kubernetes Java client to load, create, retrieve, update, scale, watch, and delete ReplicationController, ConfigMap, and Secret resources, providing complete code examples and step‑by‑step commands for managing these objects across namespaces in a Kubernetes cluster.
This article explains why Kustomize's replacements struggle with multi‑line ConfigMap data, demonstrates a failing example, and then shows how to use JSON Patch or Strategic Merge Patch via the patches field to reliably replace entire multi‑line strings such as Java .properties files.
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 explains the challenges of updating ConfigMaps and Secrets in cloud‑native environments, compares env and volume injection methods, and demonstrates how the open‑source Reloader tool can automatically watch changes and trigger rolling updates for deployments, statefulsets, and other workloads.
This guide walks through setting up a CentOS 7 environment, installing Helm, adding the OpenEBS chart repository, deploying the OpenEBS control plane, creating a dedicated PostgreSQL namespace, and configuring persistent storage with a ConfigMap, providing all necessary commands and screenshots.
Learn why ConfigMap and Secret are vital Kubernetes tools for managing non‑sensitive configuration and protecting sensitive data, explore common use cases like language settings and scaling, and follow best‑practice guidelines to secure and simplify your deployments.
This guide explains why and how to set up HTTP/HTTPS proxy settings for Kubernetes pods in enterprise environments, covering use cases, two configuration methods (ConfigMap and direct environment variables), parameter details, testing procedures, and best practices for reliable outbound traffic.
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.
The article walks through diagnosing why a second Kubernetes cluster ignored the upload‑size setting, shows how to inspect the nginx‑ingress‑controller deployment, identify the --configmap argument, and fix the issue by updating the referenced ConfigMap name to nginx‑configuration.
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.
This article uses a fish‑and‑aquarium analogy to demystify core Kubernetes concepts such as Pods, Services, ReplicaSets, ConfigMaps, and Network Policies, illustrating how applications run, scale, and communicate within a cluster.
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 guide explains what a ConfigMap is, how to define one, and how to mount it into a Pod as environment variables or files, including examples of multi‑ConfigMap usage and volume mounts for .properties files.
This comprehensive guide explains how ConfigMaps and Secrets work in Kubernetes, walks through multiple ways to provide configuration to containers—including command‑line arguments, environment variables, and volume mounts—shows how to create ConfigMaps from literals, files, or directories, and demonstrates how to consume them in Pods with env, envFrom, and volume mounts, plus best‑practice tips.
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.
This article explains how Kubernetes solves common pod launch challenges—variable configuration, sensitive data, authentication, resource limits, security isolation, and pre‑start checks—by using ConfigMaps, Secrets, ServiceAccounts, Resources, SecurityContext, and InitContainers, with practical creation commands and usage patterns.
This tutorial walks through building a Spring Cloud Kubernetes microservice solution on a local Minikube cluster, covering installation, sample service development, YAML deployment, service discovery, ConfigMaps, Secrets, Ribbon load‑balancing, Hystrix circuit breaking, health checks, and concluding with best‑practice recommendations.
