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Ops Community

Jul 15, 2026 · Information Security

How to Respond When Your Server Is Brute‑Force Attacked: Practical SSH Hardening Guide

When a public server shows a flood of "Failed password" entries and rising SSH connections, this guide walks you through distinguishing brute‑force attempts from actual compromise, gathering immutable evidence, applying immediate network and host safeguards, hardening OpenSSH configuration, managing keys, deploying fail2ban, and verifying the hardened system without losing access.

Fail2banMFASSH

0 likes · 39 min read

How to Respond When Your Server Is Brute‑Force Attacked: Practical SSH Hardening Guide

Ops Community

Jul 14, 2026 · Operations

Practical grep, awk, and sed use cases for daily operations

This article walks through the most common grep, awk, and sed scenarios that sysadmins face—searching logs, extracting context, counting errors, batch‑editing files, and performing field‑based statistics—while explaining core options, pitfalls, and best‑practice workflow recommendations.

Shell Scriptingawkgrep

0 likes · 25 min read

Practical grep, awk, and sed use cases for daily operations

Ops Community

Jul 13, 2026 · Operations

How to Diagnose a Suddenly Lagging Linux Server: Step‑by‑Step Ops Checklist

This guide walks you through a systematic, read‑only diagnostic workflow for a Linux server that becomes unresponsive, covering initial symptom clarification, data collection, CPU, memory, disk, network, application, container, and post‑mortem analysis, with concrete commands and evidence‑based decision points.

linuxmonitoringops

0 likes · 37 min read

How to Diagnose a Suddenly Lagging Linux Server: Step‑by‑Step Ops Checklist

Ops Community

Jul 12, 2026 · Databases

Which MySQL Files Can Be Safely Deleted When Disk Space Is Low?

When MySQL runs out of disk space, the safest approach is to identify the full filesystem, examine data, binlog, temporary and log directories, and use SQL‑based cleanup commands like PURGE BINARY LOGS while never manually removing critical files such as ibdata1, ib_logfile* or active binlogs.

BackupBinlogDisk Space

0 likes · 16 min read

Which MySQL Files Can Be Safely Deleted When Disk Space Is Low?

Ops Community

Jul 11, 2026 · Operations

Boost Nginx Performance: Scaling from Thousands to Ten‑Thousands RPS

The article presents a reproducible Nginx performance‑tuning workflow that starts with defining a baseline and acceptance criteria, measures CPU, file‑descriptor, upstream and disk limits, then incrementally adjusts worker settings, systemd limits, keepalive, buffering and compression, while using gray‑scale deployment and safe rollback.

BufferingGZIPNginx

0 likes · 18 min read

Boost Nginx Performance: Scaling from Thousands to Ten‑Thousands RPS

Ops Community

Jul 10, 2026 · Operations

How to Diagnose Network Packet Loss: Practical Steps from ping to tcpdump

This guide explains how to systematically investigate network packet loss on Linux by collecting timestamps, routing, interface and kernel statistics, using ping, tracepath, curl, netstat, ss, nstat, ip, ethtool, nftables/iptables, and tcpdump on both ends, then narrowing the failure scope, fixing MTU, conntrack, soft‑interrupt or firewall issues, and validating the fix with metrics and roll‑back procedures.

KubernetesMTUconntrack

0 likes · 18 min read

How to Diagnose Network Packet Loss: Practical Steps from ping to tcpdump

Ops Community

Jul 8, 2026 · Operations

Quick Nginx Log Analysis Techniques to Spot Abnormal Requests and Attack Sources

This article provides a step‑by‑step guide on using Nginx's custom log_format together with command‑line tools such as awk, grep, sort and jq to identify slow requests, 5xx spikes, CC attacks, scanners and SQL‑injection attempts, and then mitigates them with limit_req, map, geo and iptables rules, while also covering log rotation, monitoring and risk‑aware deployment practices.

DevOpsNginxlog analysis

0 likes · 37 min read

Quick Nginx Log Analysis Techniques to Spot Abnormal Requests and Attack Sources

Ops Community

Jul 5, 2026 · Operations

20 Common Ops Newbie Pitfalls – Which Ones Have You Hit?

This guide catalogs the 20 most frequent mistakes made by new operations engineers, explains why they happen, and provides step‑by‑step safe alternatives, risk warnings, and recovery procedures so readers can avoid costly outages and build reliable habits.

DevOpsKuberneteslinux

0 likes · 29 min read

20 Common Ops Newbie Pitfalls – Which Ones Have You Hit?

Ops Community

Jul 3, 2026 · Operations

10 Essential Shell Scripts to Halve Your Ops Workload

These ten practical Bash scripts automate common sysadmin tasks—disk space checks, log rotation, resource monitoring, backup validation, process guarding, port probing, and more—providing reusable, idempotent solutions with logging, alerting, dry‑run support, and cron integration to streamline operations.

BackupCronautomation

0 likes · 42 min read

10 Essential Shell Scripts to Halve Your Ops Workload

Ops Community

Jun 27, 2026 · Databases

MySQL Replication Lag Too High? 3 Quick Solutions to Restore Sync

The article explains why MySQL master‑slave replication lag occurs, lists common causes, provides a five‑level troubleshooting framework, and offers three concrete recovery methods—from emergency error skipping to multi‑threaded replication and long‑term architecture improvements—plus commands, configurations, and monitoring tips.

GTIDMTSMySQL

0 likes · 27 min read

MySQL Replication Lag Too High? 3 Quick Solutions to Restore Sync