This guide details five essential Linux commands—top, free, df, netstat, and tcpdump—for diagnosing server-level CPU, memory, disk, and network bottlenecks that cause Java application failures, providing field interpretations, anomaly thresholds, and a step-by-step troubleshooting workflow.
When Linux servers experience sudden hangs without logs or CPU spikes, memory shortages are often the hidden culprit, and this article walks developers and ops engineers through using free for quick checks, vmstat for comprehensive diagnostics, and sar for long‑term monitoring, plus a three‑step troubleshooting workflow.
This article walks through a real‑world incident where a data‑platform server showed near‑100% CPU usage, explains step‑by‑step investigation using top, pwdx, and jstack, identifies a time‑conversion utility as the root cause, and presents a streamlined script‑based solution that reduced CPU load by thirtyfold.
This guide shows how to efficiently locate errors in massive server logs using Linux commands like tail, cat, grep, sed, and navigation shortcuts, providing step‑by‑step techniques for dynamic viewing, time‑range searches, keyword filtering, and paginated inspection.
This guide walks you through a systematic, step‑by‑step process for diagnosing and resolving poor‑performance or failure incidents on Linux servers, covering everything from gathering context and checking who is logged in to inspecting processes, network services, hardware, I/O, logs, cron jobs and application‑level diagnostics.
This guide walks you through a systematic, step‑by‑step process for quickly identifying the root cause of a server outage, covering everything from gathering context and checking who is logged in to inspecting processes, network services, hardware, I/O performance, filesystem mounts, and relevant logs.
This guide walks through diagnosing a CentOS server where SSH, web, and database services are down, analyzing log files, reinstalling OpenSSH, adjusting file attributes, and configuring iptables and access controls to restore secure remote access.
A Linux server became unreachable with a massive load average of 360 due to exhausted inodes caused by a runaway postdrop process, and the issue was resolved by cleaning the maildrop directory and silencing the offending cron job.
When a Linux server experiences a failure, this guide walks you through a comprehensive 13‑step checklist—covering problem context, user activity, process inspection, network services, resource usage, hardware, I/O performance, logs, and scheduled tasks—to help you quickly pinpoint and resolve the root cause.
