Linux ops automation, cloud-native, Kubernetes, SRE, DevOps, Python, Golang and related tech discussions.
This guide walks through building a dual‑master Nginx + Keepalived high‑availability setup that doubles resource utilization, removes the idle‑backup drawback of traditional active‑passive designs, and provides step‑by‑step configuration, health‑check scripts, failover testing, best‑practice tips, and troubleshooting procedures.
The article explains that Linux’s free command can be misleading, clarifies the roles of Buffer, Cache, and Available memory, shows how to interpret /proc/meminfo, use OOM Killer, manually drop caches, configure cgroup limits, and adopt best‑practice monitoring.
The article walks through ten real‑world Kubernetes production incidents—from an etcd disk‑full disaster to image‑pull failures—detailing symptoms, root‑cause analysis, step‑by‑step remediation commands, and preventive measures such as monitoring, quota alerts, and configuration best practices.
This comprehensive guide walks you through the evolution of Linux permission models, demonstrates why careless use of 777 can lead to costly breaches, and provides step‑by‑step instructions for using chmod, ACLs, SELinux, AppArmor, and container security to enforce least‑privilege access.
This guide compiles over 200 practical kubectl commands, covering cluster setup, context switching, resource inspection, workload management, networking, storage, security hardening, high‑availability patterns, troubleshooting techniques, and performance monitoring to help operators efficiently administer Kubernetes environments.
This article analyzes why vLLM's PagedAttention can cause GPU memory fragmentation and out‑of‑memory errors in production, presents four typical OOM scenarios, and provides concrete diagnostics, configuration tweaks, code examples, and monitoring strategies to eliminate the problem.
This article demystifies Linux memory management by explaining why buffers and cache are not meant to be manually cleared, how the 'available' metric differs from 'free', and which sysctl parameters and cgroup settings you should tune to optimize performance and avoid OOM incidents.
This article walks through the root causes of MySQL master‑slave replication delay, demonstrates step‑by‑step diagnostics using SHOW SLAVE STATUS, pt‑heartbeat, and binlog comparisons, and provides concrete configuration changes, query rewrites, hardware upgrades, and monitoring scripts that can shrink lag from dozens of seconds to sub‑millisecond levels.
This guide shows how to dramatically reduce container image size using Docker multi‑stage builds, choose minimal base images, automatically generate SPDX/CycloneDX SBOMs, sign images with Cosign, and integrate the whole process into CI/CD pipelines for secure, lightweight deployments.
This guide walks through the differences between 4‑layer (TCP) and 7‑layer (HTTP) load balancing in Nginx, explains when to use each, and provides step‑by‑step configuration examples, health‑check setups, performance tuning, SSL handling, WebSocket support, and common pitfalls.
