Focused on sharing DevOps, Kubernetes, Linux, Docker, Istio, microservices, Spring Cloud, Python, Go, databases, Nginx, Tomcat, cloud computing, and related technologies.
In a Kubernetes cluster the kube-scheduler pod may stay pending due to a container-name reservation conflict; this guide shows how to locate the offending container with ctr, delete it, restart kubelet, and verify that the pod returns to Running state.
This guide explains Dockerfile fundamentals, enumerates all major instructions, and provides step‑by‑step examples for creating minimal Apache (httpd) images on both RockyLinux and Alpine using Podman, including building, testing, tagging, and pushing to Docker Hub.
This article explains how K3s's new embedded container image feature lets Kubernetes nodes share OCI images peer‑to‑peer, eliminating external registry dependence and speeding up distribution in offline, low‑bandwidth, or geographically dispersed environments.
When Kubernetes certificates expire, the cluster becomes unusable; this guide explains how to check certificate expiration, renew the affected certificates with kubeadm, verify the updates, and restart control‑plane components to bring the cluster back online, including HA considerations.
This guide explains how to optimize Nginx settings and adjust Linux kernel parameters—such as worker processes, connection limits, caching, HTTP/2, rate limiting, and TCP tweaks—to reliably handle massive traffic spikes while maintaining high availability and performance.
Learn how to secure a Linux server by configuring firewalls with iptables and firewalld, managing user permissions, setting up auditd, applying automatic updates, and deploying intrusion detection tools like OSSEC and AIDE, plus a step‑by‑step response workflow for real‑world attack scenarios.
This guide explains how to monitor memory usage on Linux servers, identify common causes of sudden memory consumption such as leaks, stuck processes, or high load, and provides concrete commands and remediation steps to stabilize system performance.
This guide outlines practical strategies for designing and optimizing network and storage in Kubernetes clusters of over 5,000 nodes, covering overlay networks, IP pool segmentation, bandwidth allocation, load balancing, security policies, distributed storage options, performance tuning, and reliable backup solutions.
To prevent service disruption caused by overly aggressive or sluggish Kubernetes liveness and readiness probes, this guide shows how to implement a custom health‑check script that periodically tests a service endpoint, exits the container on failure, and lets Kubernetes automatically restart the pod.
This article introduces ten essential Kubernetes technologies—including Helm Charts, Operators, Service Mesh, StatefulSets, CRDs, Network Policies, Pod Disruption Budgets, HPA, Persistent Volumes, and Ingress Controllers—explaining their core concepts, key capabilities, and how they improve application reliability, scalability, and security.
