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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

Aug 28, 2026 · Operations

20 Essential tcpdump Commands Every Ops Engineer Should Know

This comprehensive guide introduces tcpdump, the Linux equivalent of Wireshark, and walks through 20 frequently used command combinations covering basic packet capture, filtering by host, port, protocol, output formatting, performance tuning, advanced BPF filters, real‑world troubleshooting scenarios, and best‑practice recommendations for production environments.

BPFLinuxNetwork Troubleshooting

0 likes · 36 min read

20 Essential tcpdump Commands Every Ops Engineer Should Know

Raymond Ops

Aug 27, 2026 · Operations

Why Is Your Linux Server Booting So Slowly? Practical Boot Chain Optimization

The article explains why Linux servers often experience slow boot times, outlines a systematic method to analyze each stage of the boot chain—from firmware to user services—identifies common bottlenecks, and provides concrete systemd, BIOS, GRUB, initramfs, and service‑level optimizations with commands and verification steps.

GRUBLinuxboot optimization

0 likes · 33 min read

Why Is Your Linux Server Booting So Slowly? Practical Boot Chain Optimization

Raymond Ops

Aug 26, 2026 · Operations

Beyond Interview Answers: Mastering TCP’s Three‑Way Handshake and Four‑Way Teardown

This article walks through TCP fundamentals, explains each step of the three‑way handshake and four‑way termination, examines kernel parameters, common connection‑state problems such as TIME_WAIT and CLOSE_WAIT, and provides practical commands and scripts for diagnosing and tuning TCP on Linux.

LinuxTCPTroubleshooting

0 likes · 30 min read

Beyond Interview Answers: Mastering TCP’s Three‑Way Handshake and Four‑Way Teardown

Raymond Ops

Aug 25, 2026 · Operations

30 Essential Linux Ops Commands Every Engineer Should Know

This guide presents 30 of the most frequently used Linux commands for operations engineers, organized into seven categories and illustrated with real‑world scenarios, parameter examples, safety warnings, and step‑by‑step usage tips to help you manage files, monitor systems, handle processes, diagnose networks, control users, compress data, and manage services.

Command LineLinuxNetworking

0 likes · 50 min read

30 Essential Linux Ops Commands Every Engineer Should Know

Raymond Ops

Aug 24, 2026 · Operations

20 Must‑Change Linux Kernel Parameters for Production Environments

This article presents a practical checklist of 20 Linux kernel parameters—grouped by network, memory, process, and filesystem settings—explaining their default values, typical failure symptoms, step‑by‑step tuning commands, verification methods, and rollback procedures to ensure production systems such as web servers, databases, caches, and containers run without kernel‑level bottlenecks.

KernelLinuxmemory

0 likes · 34 min read

20 Must‑Change Linux Kernel Parameters for Production Environments

Raymond Ops

Aug 23, 2026 · Information Security

Defend Against SSH Brute‑Force Attacks with Fail2ban: Real‑World Auto‑Blocking Guide

This article explains why SSH brute‑force attacks are a real threat, describes Fail2ban's three‑layer workflow, walks through installation and basic SSH jail configuration, details key parameters, shows how to customize filters, actions, and alerts, and provides advanced tuning, troubleshooting, and production‑ready templates for robust SSH protection.

Fail2banLinux securitySSH

0 likes · 34 min read

Defend Against SSH Brute‑Force Attacks with Fail2ban: Real‑World Auto‑Blocking Guide

Raymond Ops

Aug 21, 2026 · Information Security

How to Perform a Complete Server Port Security Audit with nmap

This guide walks ops engineers through installing nmap, understanding its scan techniques, executing single‑port, common‑port, full‑range, and script‑based scans, analyzing results, and applying remediation steps such as firewall rules, service hardening, and regular scanning schedules to keep server exposure minimal.

Linuxfirewallnmap

0 likes · 32 min read

How to Perform a Complete Server Port Security Audit with nmap

Raymond Ops

Aug 17, 2026 · Databases

How to Diagnose and Fix MySQL Deadlocks Without Just Restarting the Service

This article explains why MySQL deadlocks occur in production, distinguishes them from simple lock waits, and provides a step‑by‑step guide—including enabling deadlock logging, analyzing InnoDB lock types, and applying four practical solutions such as distributed locks, unique constraints, isolation‑level changes, and SQL reordering—to reliably troubleshoot and prevent deadlocks.

DeadlockInnoDBMySQL

0 likes · 31 min read

How to Diagnose and Fix MySQL Deadlocks Without Just Restarting the Service

Raymond Ops

Aug 17, 2026 · Operations

Master Linux System Log Analysis to Quickly Troubleshoot Issues

This comprehensive guide walks junior to mid‑level system administrators through Linux log fundamentals, essential command‑line tools like grep, awk, sed and journalctl, and step‑by‑step troubleshooting scenarios for SSH, service failures, disk space, memory leaks, security incidents, and application logs, providing practical scripts and advanced techniques for effective log‑driven problem resolution.

Fail2banLinuxTroubleshooting

0 likes · 29 min read

Master Linux System Log Analysis to Quickly Troubleshoot Issues

Raymond Ops

Aug 16, 2026 · Operations

Top 10 Nginx Misconfigurations That Cause Outages and How to Fix Them

This article reviews ten common Nginx configuration mistakes that frequently trigger production incidents, explains the underlying causes, provides corrected configurations, verification steps, and risk warnings, and offers a systematic troubleshooting workflow for operators to quickly diagnose and resolve issues.

DevOpsNginxSecurity

0 likes · 59 min read

Top 10 Nginx Misconfigurations That Cause Outages and How to Fix Them