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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
Oct 16, 2026 · Operations

Accidental rm -rf in Production: Complete Linux Data Recovery Guide

This guide details step-by-step recovery strategies after accidental rm -rf deletion in Linux production environments, covering immediate write cessation, backup/snapshot verification, /proc file descriptor rescue, block-level imaging, filesystem-specific tools for ext4/XFS/Btrfs/ZFS, container/Kubernetes considerations, validation procedures, and prevention practices.

BackupData RecoveryFile Systems
0 likes · 46 min read
Accidental rm -rf in Production: Complete Linux Data Recovery Guide
Raymond Ops
Raymond Ops
Oct 15, 2026 · Operations

10 Linux Commands to Diagnose 80% of Production Incidents

This guide presents a systematic 10-command Linux troubleshooting workflow—from uptime to dmesg—that helps engineers quickly isolate CPU, memory, disk, and network bottlenecks, avoid common misdiagnoses, and apply evidence-based fixes with proper verification and post-mortem practices.

command-linelinuxoperations
0 likes · 35 min read
10 Linux Commands to Diagnose 80% of Production Incidents
Raymond Ops
Raymond Ops
Oct 14, 2026 · Databases

MySQL Replication Lag Spikes to 10 Min: Topology Optimization Rescue Guide

This guide provides a systematic methodology to diagnose and resolve MySQL replication lag spikes, covering evidence collection, replication status analysis, parallel replication tuning, large transaction mitigation, topology isolation, safe configuration changes, replica rebuild procedures, and proactive monitoring setup.

GTIDMySQLlag
0 likes · 43 min read
MySQL Replication Lag Spikes to 10 Min: Topology Optimization Rescue Guide
Raymond Ops
Raymond Ops
Oct 13, 2026 · Databases

MySQL 8.0 Upgrade Guide: 20 Critical Migration Pitfalls from 5.7

This comprehensive guide details 20 critical technical checks for migrating from MySQL 5.7 to 8.0, covering authentication plugins, character sets, reserved words, strict SQL modes, replication setup, backup validation, and cutover procedures with executable SQL and bash examples.

BackupCharacter EncodingDatabase Migration
0 likes · 23 min read
MySQL 8.0 Upgrade Guide: 20 Critical Migration Pitfalls from 5.7
Raymond Ops
Raymond Ops
Sep 24, 2026 · Operations

Master LVM from Zero: Complete Guide to Logical Volume Management, Expansion, Snapshots & Migration

This comprehensive guide covers LVM fundamentals (PV/VG/LV/FS), PE/LE concepts, metadata management, and practical scenarios including online expansion, dangerous shrinking, disk migration via pvmove, snapshot backups, cache/thin provisioning, metadata recovery, and production best practices with exact commands and rollback procedures.

LVMLinux storageSnapshots
0 likes · 66 min read
Master LVM from Zero: Complete Guide to Logical Volume Management, Expansion, Snapshots & Migration
Raymond Ops
Raymond Ops
Sep 21, 2026 · Operations

Nginx Rate Limiting in Practice: Defending Against CC Attacks and Traffic Spikes

This comprehensive guide covers Nginx rate limiting fundamentals, leaky bucket algorithm, configuration directives (limit_req_zone, limit_req, limit_conn_zone), practical scenarios (IP/URI-based limiting, whitelists, blacklists, CC attack defense), testing tools (wrk, ab, vegeta), monitoring with Prometheus, troubleshooting cases, and production rollout/rollback strategies.

NginxPrometheuscc-attack
0 likes · 42 min read
Nginx Rate Limiting in Practice: Defending Against CC Attacks and Traffic Spikes
Raymond Ops
Raymond Ops
Sep 20, 2026 · Operations

Beyond top: 5 Linux Performance Commands That Save Production Systems

This article teaches Linux performance troubleshooting beyond top, covering vmstat, mpstat, pidstat, iostat, sar, perf, and bpftrace with real-world scenarios, key metrics, step-by-step diagnosis flows, and practical fixes for CPU, memory, disk, network, and context-switch issues.

iostatlinux-performancempstat
0 likes · 53 min read
Beyond top: 5 Linux Performance Commands That Save Production Systems
Raymond Ops
Raymond Ops
Sep 18, 2026 · Operations

find vs locate: Mastering Million-File Search & Safe Cleanup in Linux Operations

This comprehensive guide compares find and locate for large-scale Linux file retrieval, covering performance bottlenecks, safe deletion practices, inode exhaustion troubleshooting, and production-ready scripts with dry-run, trash-based cleanup, and monitoring integration for million-file environments.

file-searchfindinode exhaustion
0 likes · 76 min read
find vs locate: Mastering Million-File Search & Safe Cleanup in Linux Operations
Raymond Ops
Raymond Ops
Sep 17, 2026 · Databases

MySQL & PostgreSQL Monitoring: Critical Metrics & Alert Thresholds Explained

This comprehensive guide covers MySQL and PostgreSQL monitoring essentials, including key metrics (connections, throughput, InnoDB, replication), version-specific differences, alert thresholds, exporter deployment (mysqld_exporter, postgres_exporter), Grafana dashboards, Prometheus alerting rules, troubleshooting playbooks for common issues like connection exhaustion, replication lag, deadlocks, and disk growth, plus automation scripts for long-transaction killing and slow-query analysis.

Database MonitoringExportersGrafana
0 likes · 74 min read
MySQL & PostgreSQL Monitoring: Critical Metrics & Alert Thresholds Explained