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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

Oct 26, 2026 · Operations

Essential Linux Ops Commands: 50+ Tools to Cut Troubleshooting Time in Half

This comprehensive guide categorizes 50+ essential Linux commands for system troubleshooting, covering processes, memory, CPU, disk I/O, filesystems, networking, logs, and text processing, with practical examples, parameter explanations, output interpretation, and risk-level classifications to help ops engineers build rapid diagnostic reflexes.

bashcommand-linelinux

0 likes · 56 min read

Essential Linux Ops Commands: 50+ Tools to Cut Troubleshooting Time in Half

Raymond Ops

Oct 25, 2026 · Operations

Linux CPU Spike Troubleshooting: From Alert to Root Cause

A comprehensive guide to diagnosing Linux server CPU spikes using systematic evidence chains: verify alert scope, identify processes and threads, distinguish user/kernel/interrupt time, analyze memory and I/O pressure, leverage perf and language runtimes, check container quotas, correlate deployments and cron jobs, and validate fixes with repeatable measurements.

JavaPythoncgroup

0 likes · 38 min read

Linux CPU Spike Troubleshooting: From Alert to Root Cause

Raymond Ops

Oct 24, 2026 · Databases

Right-Sizing Database Connection Pools: From Guesswork to Capacity Budgeting

This article explains how to determine optimal database connection pool sizes by establishing a capacity budget, monitoring pool and database metrics, configuring HikariCP for PostgreSQL, and iteratively tuning based on workload characteristics rather than relying on generic formulas.

HikariCPKubernetesPerformance Tuning

0 likes · 38 min read

Right-Sizing Database Connection Pools: From Guesswork to Capacity Budgeting

Raymond Ops

Oct 23, 2026 · Operations

SSH Brute-Force Attack? 14-Step Linux Server Forensics & Hardening Guide

This comprehensive guide details a 14-step process for investigating and responding to SSH brute-force attacks on Linux servers, covering evidence preservation, login analysis, configuration auditing, account verification, cron job inspection, process and network forensics, file integrity checks, emergency containment, system hardening, lateral movement detection, and post-incident review with rollback procedures.

Incident ResponseLinux-forensicsSSH

0 likes · 83 min read

SSH Brute-Force Attack? 14-Step Linux Server Forensics & Hardening Guide

Raymond Ops

Oct 22, 2026 · Operations

MySQL Replication Lag Spikes: A 10-Minute Diagnostic Framework

This guide provides a structured 10-minute triage process for sudden MySQL replication lag, covering IO/SQL thread diagnosis, GTID gap analysis, source write-rate checks, replica resource contention, and safe mitigation actions with ready-to-run evidence-collection scripts.

GTIDMySQLdiagnosis

0 likes · 41 min read

MySQL Replication Lag Spikes: A 10-Minute Diagnostic Framework

Raymond Ops

Oct 21, 2026 · Operations

Network Unreachable? Layered Troubleshooting with ping, telnet, curl & traceroute

This guide explains how to systematically troubleshoot server network connectivity using ping, telnet, curl, and traceroute, showing what each tool verifies at different network layers, how to interpret results, avoid common misdiagnoses, and build evidence chains for root-cause analysis.

DNSKubernetesLinux networking

0 likes · 58 min read

Network Unreachable? Layered Troubleshooting with ping, telnet, curl & traceroute

Raymond Ops

Oct 20, 2026 · Operations

Linux Network Tuning Golden Rule: Diagnose Queues Before Tweaking /proc/sys/net Parameters

This article teaches a systematic approach to Linux network parameter tuning: identify bottlenecks via queue statistics, conntrack usage, and softirq metrics before adjusting sysctl values, covering listen queues, NIC backlogs, port exhaustion, keepalive, congestion control, and verification with rollback procedures.

capacity planningconntrackkernel-parameters

0 likes · 33 min read

Linux Network Tuning Golden Rule: Diagnose Queues Before Tweaking /proc/sys/net Parameters

Raymond Ops

Oct 19, 2026 · Operations

Linux CPU at 99%? 6 Troubleshooting Commands That Saved Me 3 Times

This guide presents a systematic, evidence-based approach to diagnosing Linux CPU spikes using six core commands and deeper analysis of processes, threads, cgroups, and runtime profiling to distinguish between user-space computation, system calls, I/O wait, soft interrupts, and container throttling.

Incident ResponseObservabilitycontainer-monitoring

0 likes · 30 min read

Linux CPU at 99%? 6 Troubleshooting Commands That Saved Me 3 Times

Raymond Ops

Oct 18, 2026 · Databases

MySQL Index Optimization: Confirm Slow Queries, Prove Access Paths, Add Indexes Safely

This guide details a systematic approach to MySQL index optimization: verify slow queries using performance_schema and system metrics, prove access paths with EXPLAIN ANALYZE, create indexes with rollback strategies using ALGORITHM=INPLACE and LOCK=NONE, address deep pagination with keyset pagination and N+1 queries with batch loading, and validate improvements with latency percentiles and lock metrics.

EXPLAIN ANALYZEIndex OptimizationInnoDB

0 likes · 12 min read

MySQL Index Optimization: Confirm Slow Queries, Prove Access Paths, Add Indexes Safely

Raymond Ops

Oct 17, 2026 · Databases

MySQL Replication Lag Spikes to 10s? 3 Key Parallel Replication Optimizations

This article details a systematic approach to diagnose and resolve MySQL 8.0 replication lag by enabling WRITESET on the source, configuring LOGICAL_CLOCK with optimal worker count on the replica, and preserving commit order, complete with diagnostic queries, configuration steps, and validation metrics.

GTIDLOGICAL_CLOCKMySQL

0 likes · 31 min read

MySQL Replication Lag Spikes to 10s? 3 Key Parallel Replication Optimizations