sysadmin – Page 4 – ITFROMZERO

MySQL Error Log and General Query Log: Production Troubleshooting Techniques for Sysadmins

By admin July 11, 2026

Learn how to configure MySQL Error Log and General Query Log for rapid system diagnostics. Practical insights on log management and production debugging.

Linux

Linux Filesystem Comparison: ext4, XFS, Btrfs, and F2FS — Choosing the Right One for Each Server Scenario

By admin July 10, 2026

A detailed comparison of four popular Linux filesystems — ext4, XFS, Btrfs, and F2FS — covering performance, key features, and real-world use cases. A practical guide to choosing the right filesystem for each server type: database, storage, general purpose, and flash storage devices.

Centos

Installing Elasticsearch and Kibana on CentOS Stream 9: Tips for Handling SELinux and Firewalld

By admin July 10, 2026

No more manual log hunting. A guide to installing Elasticsearch and Kibana on CentOS Stream 9, with a focus on proper SELinux and Firewalld configuration for production environments.

Virtualization

KVM/Proxmox Benchmarking: Measure CPU, Disk, and Network Performance Like a Pro

By admin July 5, 2026

In-depth guide to KVM/Proxmox benchmarking. Use fio, sysbench, and iperf3 to measure IOPS, CPU, and Network performance to optimize VMs before going live.

VMware

Configuring vSphere Alarms and Email Notifications: Automated SysAdmin Alerts When ESXi CPU, RAM, and Datastore Exceed Thresholds

By admin July 1, 2026

A comparison of three ESXi monitoring approaches (native alarms, Zabbix, PowerCLI) and a practical walkthrough for deploying vSphere Alarms to automatically email SysAdmins when CPU, RAM, or Datastore usage hits dangerous thresholds. Step-by-step from SMTP configuration to fine-tuning thresholds to avoid alert fatigue.

MySQL

Optimizing my.cnf for MySQL 8: Don’t Let Your Server ‘Choke’ on Default Settings

By admin June 28, 2026

MySQL 8's default configuration is often underpowered. This guide shows you how to optimize my.cnf to maximize RAM and CPU usage for better database load handling.

Virtualization

Managing KVM via Web with Kimchi and Wok: Lightweight, Smooth, and a True Virt-manager Alternative

By admin June 26, 2026

Forget Virt-manager! A detailed guide to installing Kimchi and Wok to manage KVM virtual machines directly from your browser — lightweight, smooth, and perfect for Linux servers.

Linux

Linux Compression and Extraction: Don’t Let Your Server Hang by Choosing the Wrong Format

By admin June 25, 2026

Discover how to use tar, gzip, xz, and zstd to optimize Linux server storage. This article provides practical comparisons and tips for monitoring large file compression progress.

Linux

How to Configure kdump on Linux: Collecting Kernel Crash Dumps and Analyzing Critical System Failures

By admin June 25, 2026

kdump captures the entire state of RAM at the moment of a kernel panic — before the system has a chance to reboot. It is the only tool that allows sysadmins to investigate the root cause of a server crash when the logs record nothing. This guide covers installing and configuring kdump on RHEL/CentOS/Ubuntu, safely triggering a test crash, and analyzing vmcore files with the crash tool.

Linux

Automated Temporary File Management with systemd-tmpfiles: Don’t Let Your Server Die from Junk

By admin June 25, 2026

Avoid server downtime due to full disks. Learn how to use systemd-tmpfiles to automatically clean up temporary files and manage Linux system directories professionally and safely.