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Raymond Ops

Linux ops automation, cloud-native, Kubernetes, SRE, DevOps, Python, Golang and related tech discussions.

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Latest from Raymond Ops

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Raymond Ops

Jul 13, 2026 · Operations

Scaling Prometheus to Thousands of Nodes with Thanos: Architecture, Storage, and HA Practices

The article analyzes the storage, query performance, high‑availability, and data‑loss challenges of running Prometheus on a 1,000‑node Kubernetes cluster and demonstrates how a Thanos‑based architecture—Sidecar, Query, Store Gateway, Compactor, Receiver, and object‑storage back‑ends—can be designed, tuned, and operated to achieve horizontal scalability, efficient down‑sampling, and reliable fault recovery.

KubernetesPrometheusScaling

0 likes · 35 min read

Scaling Prometheus to Thousands of Nodes with Thanos: Architecture, Storage, and HA Practices

Raymond Ops

Jul 13, 2026 · Operations

Systematic Root‑Cause Analysis for NFS Mount Failures

This guide presents a systematic, layer‑by‑layer methodology for diagnosing and resolving NFS share mount failures, covering version differences, architecture layers, key daemons, RPC mechanisms, common error messages, detailed server and client checks, firewall and SELinux considerations, performance tuning, high‑availability setups, and monitoring.

KerberosNFSPerformance Tuning

0 likes · 50 min read

Systematic Root‑Cause Analysis for NFS Mount Failures

Raymond Ops

Jul 12, 2026 · Operations

Essential Port Connectivity Troubleshooting: A Complete Step‑by‑Step Guide

This guide walks you through a systematic, seven‑layer approach to diagnosing port connectivity failures on Linux systems, covering service listening checks, local firewall rules, SELinux policies, network path analysis, cloud security groups, and application‑level protocols, with concrete commands, scripts, case studies, best‑practice recommendations, and monitoring tips.

firewalllinuxmonitoring

0 likes · 40 min read

Essential Port Connectivity Troubleshooting: A Complete Step‑by‑Step Guide

Raymond Ops

Jul 11, 2026 · Cloud Native

Kubernetes HPA & VPA Auto-Scaling: Elastic Strategies for Traffic Spikes

An in‑depth comparison of Kubernetes Horizontal and Vertical Pod Autoscalers—including algorithms, configurations, performance benchmarks, mixed‑mode trade‑offs, custom‑metric integrations, and real‑world case studies—demonstrates how to choose and tune HPA, VPA, and KEDA for rapid traffic spikes while avoiding conflicts.

AutoscalingCloud NativeHPA

0 likes · 47 min read

Kubernetes HPA & VPA Auto-Scaling: Elastic Strategies for Traffic Spikes

Raymond Ops

Jul 11, 2026 · Databases

How to Diagnose and Optimize Production Database Connection Pool Exhaustion

This article walks through the principles of database connection pools, common causes of pool exhaustion such as leaks, mis‑configuration, slow SQL and DB limits, and provides a step‑by‑step methodology with monitoring, thread‑stack analysis, and concrete configuration and SQL optimizations to restore stability.

Connection PoolHikariCPJava

0 likes · 29 min read

How to Diagnose and Optimize Production Database Connection Pool Exhaustion

Raymond Ops

Jul 10, 2026 · Artificial Intelligence

How to Diagnose and Fix Common LLM Service Errors: Timeout, Rate Limiting, and OOM

This guide presents a systematic, step‑by‑step methodology for troubleshooting large‑language‑model services, covering how to identify and resolve timeout, rate‑limiting, and out‑of‑memory (OOM) failures, with concrete commands, configuration examples, case studies, and monitoring recommendations.

Out of Memorylarge language modelrate limiting

0 likes · 63 min read

How to Diagnose and Fix Common LLM Service Errors: Timeout, Rate Limiting, and OOM

Raymond Ops

Jul 10, 2026 · Operations

Mastering Rsync Incremental Backups: Configuration, Optimization, and Practical Implementation

This guide walks through the fundamentals of rsync incremental backups, explaining the delta algorithm, file comparison rules, optimal parameter choices, real‑world performance comparisons, and step‑by‑step scripts for installation, daily cron jobs, link‑dest rotation, real‑time syncing with inotify, and robust monitoring and error handling.

BackupCronIncremental Backup

0 likes · 49 min read

Mastering Rsync Incremental Backups: Configuration, Optimization, and Practical Implementation

Raymond Ops

Jul 9, 2026 · Operations

Practical Guide to Troubleshooting and Resolving DNS Issues

This comprehensive guide explains how DNS works, categorises common resolution failures, and provides step‑by‑step procedures, command‑line examples and configuration snippets for diagnosing and fixing DNS problems in Linux, Kubernetes and cloud environments.

DNSKubernetesdig

0 likes · 52 min read

Practical Guide to Troubleshooting and Resolving DNS Issues

Raymond Ops

Jul 8, 2026 · Operations

Advanced OpenClaw Configuration and Automation Ops Guide

This guide walks engineers through OpenClaw's three‑level configuration hierarchy, JSON5 format, hot‑reload modes, safe restart procedures, systemd service setup, logging, health checks, cron scheduling, memory compaction, vector search integration, Discord and Telegram bot integration, and detailed troubleshooting workflows for production deployments.

ConfigurationCronDiscord

0 likes · 40 min read

Advanced OpenClaw Configuration and Automation Ops Guide

Raymond Ops

Jul 8, 2026 · Operations

10 Essential System Commands Every Ops Engineer Should Master

This guide explains why core Linux commands are indispensable for ops engineers, categorizes them into monitoring, networking, disk analysis, text processing and service management, and provides detailed usage examples, troubleshooting scenarios, and decision‑tree guidance for effective system administration.

Disk ManagementShell Scriptinglinux

0 likes · 47 min read

10 Essential System Commands Every Ops Engineer Should Master