system administration – ITFROMZERO

Mastering SELinux Custom Policies: Don’t Disable Security Just Because of ‘Permission Denied’

By admin April 5, 2026

Don't disable SELinux just because of a Permission Denied error. Learn how to create Custom Policies to protect Linux servers using the Principle of Least Privilege.

Docker

Docker Hogging All Your Disk Space? Pro Tips to Clean Up Images, Containers, and Volumes to Save Your Server

By admin April 2, 2026

Docker hogging disk space is a DevOps nightmare. This article shares how to use prune commands effectively and configure log rotation to rescue your server from storage issues.

Linux

Is Linux Fragmented? How to Check and Optimize EXT4 and XFS Drives to Boost I/O Speed

By admin March 31, 2026

The idea that Linux doesn't fragment is a myth. Learn how to use e4defrag and xfs_fsr to check and optimize drives, effectively boosting server I/O performance.

VMware

vSphere HA & DRS: The “Lifesaving” Duo for a Worry-Free Virtual Infrastructure

By admin March 30, 2026

Don't let system outages disrupt your business. A detailed guide on configuring vSphere HA for automatic VM recovery and DRS for professional server resource optimization.

Monitoring

Email Alerts with Grafana: Stop Finding Out About Downtime Too Late

By admin March 29, 2026

Don't let your dashboards be just for show. A detailed guide on configuring SMTP and Grafana Alerting to receive instant incident notifications via email.

Network

Diagnosing and Troubleshooting Network Connectivity Issues on Linux: A Guide to `ip`, `route`, `dig`, `netcat`, and More

By admin March 28, 2026

Network connectivity issues on Linux servers can arise unexpectedly, causing significant disruption. This article guides you through using powerful tools like `ip`, `route`, `dig`, and `netcat` to systematically diagnose and resolve problems, just as you would handle a real-world production incident.

Linux

Managing GRUB2 on Linux: A Guide to Configuration, Troubleshooting, and Boot System Customization

By admin March 26, 2026

GRUB2 is Linux's essential bootloader. This article shares practical experience on configuring, troubleshooting boot issues, and customizing GRUB2. You'll discover useful tips, detailed command examples, and best practices to fully master this powerful tool.

Python

Python and Linux: Useful Sysadmin Scripts for Task Automation

By admin March 22, 2026

How to effectively handle repetitive tasks on Linux? Python is the answer. This article guides you on writing useful Python scripts to automate system administration work, helping you be more efficient and reduce risks.

Security

System File Integrity Monitoring with AIDE on Linux: Early Intrusion Detection and Data Tampering Prevention

By admin March 22, 2026

Ensuring Linux server security is a top priority, and File Integrity Monitoring (FIM) with AIDE is an effective solution. This article shares practical experience deploying AIDE for early intrusion detection and prevention of system data tampering.

Security

Hardening Linux Server: A Comprehensive Security Checklist for Beginners

By admin March 20, 2026

In the digital age, Linux server security is vital. This article offers a comprehensive hardening checklist covering essential steps – from system updates, SSH configuration, to firewalls and user management – helping you protect your server from all online threats.