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Raymond Ops
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Raymond Ops

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

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Recent Articles

Latest from Raymond Ops

100 recent articles max
Raymond Ops
Raymond Ops
Sep 2, 2026 · Operations

Essential Network Basics for Ops: IP, Subnet Mask, and Gateway Explained in One Go

This guide walks operations engineers through IP addressing, binary‑decimal conversion, classful and private address ranges, subnet masks and CIDR notation, gateway functions, VLAN concepts, routing tables, DNS basics, Docker/Kubernetes networking, firewall rules, and practical troubleshooting steps, all illustrated with concrete commands and examples.

DNSDockerGateway
0 likes · 36 min read
Essential Network Basics for Ops: IP, Subnet Mask, and Gateway Explained in One Go
Raymond Ops
Raymond Ops
Sep 1, 2026 · Operations

Master Linux File Permissions: How to Use chmod and chown Effectively

This comprehensive guide explains Linux's permission model, demonstrates numeric and symbolic chmod usage, details chown operations, introduces ACL for fine‑grained control, and provides troubleshooting steps and security best practices for production environments.

ACLchmodchown
0 likes · 33 min read
Master Linux File Permissions: How to Use chmod and chown Effectively
Raymond Ops
Raymond Ops
Aug 31, 2026 · Operations

scp vs rsync: Choosing the Right Tool for Server File Transfers

This guide explains the principles, syntax, common parameters, practical examples, error handling, and performance differences of scp and rsync, helping system administrators decide which tool to use for small one‑off copies, large incremental syncs, bandwidth‑limited transfers, and production deployment scenarios.

BackupSynchronizationfile transfer
0 likes · 30 min read
scp vs rsync: Choosing the Right Tool for Server File Transfers
Raymond Ops
Raymond Ops
Aug 29, 2026 · Operations

Master Linux Filesystem: Quick Guide to Understanding Directory Structure

This guide explains why mastering the Linux directory hierarchy is essential for sysadmins, outlines the FHS standard, details each top‑level directory such as /etc, /usr, /var, and provides practical commands, examples, and safety tips for navigating, troubleshooting, and managing files across common distributions.

Filesystemdirectory structurefhs
0 likes · 42 min read
Master Linux Filesystem: Quick Guide to Understanding Directory Structure
Raymond Ops
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.

BPFShell Scriptinglinux
0 likes · 36 min read
20 Essential tcpdump Commands Every Ops Engineer Should Know
Raymond Ops
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.

GRUBStartup Performanceboot optimization
0 likes · 33 min read
Why Is Your Linux Server Booting So Slowly? Practical Boot Chain Optimization
Raymond Ops
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-linelinuxmonitoring
0 likes · 50 min read
30 Essential Linux Ops Commands Every Engineer Should Know
Raymond Ops
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.

Memorykernellinux
0 likes · 34 min read
20 Must‑Change Linux Kernel Parameters for Production Environments
Raymond Ops
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