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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 11, 2026 · Operations

Master Linux Ops: Essential High-Frequency Commands for Daily Production Use

A comprehensive, scenario-driven reference covering 30+ categories of Linux operations commands — system info, processes, CPU, memory, network, disk, files, logs, users, services, packages, scheduling, performance analysis, text processing, SSH, troubleshooting workflows, dangerous commands, auditing, and efficiency tips — each with purpose, key parameters, real-world examples, and risk warnings.

Command LineDevOpsLinux
0 likes · 59 min read
Master Linux Ops: Essential High-Frequency Commands for Daily Production Use
Raymond Ops
Raymond Ops
Sep 9, 2026 · Operations

Linux Logging Deep Dive: Kernel, journald, rsyslog & 5 Real Fault Cases

This comprehensive guide dissects the Linux logging stack — kernel ring buffer, journald, rsyslog, logrotate, and service logs — with configuration details, command references, and five step-by-step troubleshooting cases covering SSH brute force, disk exhaustion, OOM kills, network packet loss, and systemd service failures.

LinuxTroubleshootingjournald
0 likes · 47 min read
Linux Logging Deep Dive: Kernel, journald, rsyslog & 5 Real Fault Cases
Raymond Ops
Raymond Ops
Sep 5, 2026 · Operations

Linux Time Synchronization Mastery: Chrony Best Practices for Production Systems

Comprehensive guide covering Linux time concepts, NTP protocol, chrony vs ntpd, clock source selection, leap second handling, configuration templates for cloud, containers, Kubernetes, and isolated networks, plus verification, monitoring, troubleshooting, compliance automation, and rollback strategies.

ComplianceKubernetesLinux operations
0 likes · 54 min read
Linux Time Synchronization Mastery: Chrony Best Practices for Production Systems
Raymond Ops
Raymond Ops
Sep 4, 2026 · Operations

CPU 100% at 3 AM: Complete Troubleshooting Guide with Real Incident Analysis

This article provides a step-by-step guide to troubleshooting CPU 100% incidents in production, covering Linux CPU metrics, Java GC and thread analysis with jstat/jstack/Arthas, system-level tools like perf and flame graphs, and a detailed case study where MySQL backup-induced replica lag triggered cascading Full GCs and CPU saturation.

CPU troubleshootingGC analysisJVM tuning
0 likes · 49 min read
CPU 100% at 3 AM: Complete Troubleshooting Guide with Real Incident Analysis
Raymond Ops
Raymond Ops
Sep 3, 2026 · Operations

frp vs WireGuard vs Tailscale: Hands-on Internal Network Penetration Comparison

This comprehensive guide compares frp, WireGuard, and Tailscale for internal network penetration, detailing deployment steps, configuration examples, troubleshooting tips, real-world latency and bandwidth benchmarks, and scenario-based recommendations to help operations engineers select the optimal solution.

HeadscaleNAT traversalNetwork Troubleshooting
0 likes · 36 min read
frp vs WireGuard vs Tailscale: Hands-on Internal Network Penetration Comparison
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.

DNSDockerIP
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.

LinuxSecurityacl
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.

BackupLinuxfile 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.

LinuxTroubleshootingdirectory structure
0 likes · 42 min read
Master Linux Filesystem: Quick Guide to Understanding Directory Structure