sysadmin – Page 9 – ITFROMZERO

Mastering Policy-Based Routing (PBR) on Linux: Route Traffic Like a Pro

By admin April 20, 2026

Don't let backup traffic clog your main connection. A detailed guide on using Policy-Based Routing (PBR) on Linux to intelligently route traffic based on source IP and Port.

Monitoring

smartmontools Guide: Diagnosing Linux Hard Drive Issues Before Your Data Vanishes

By admin April 20, 2026

Don't let your hard drive die in silence. A detailed guide on using smartmontools to diagnose HDD/SSD health on Linux and setting up automated Telegram alerts.

Security

Auditd Configuration Guide: The “Black Box” for Tracking Every Change on Linux

By admin April 20, 2026

Hackers can wipe history but they can't hide from Auditd. A guide to configuring the Linux "black box" to trace file edits, command execution, and overall server security.

Centos

The Secret to Server ‘Immortality’: Configuring HA Clusters with Pacemaker and Corosync

By admin April 17, 2026

Learn how to build a High Availability (HA) Cluster with Pacemaker and Corosync on CentOS/Rocky Linux. A detailed guide from installation and Virtual IP configuration to handling Split-brain errors.

Network

DNS Configuration on Linux: Permanently Fix Settings Being Lost After Reboot

By admin April 15, 2026

Tired of losing DNS settings in /etc/resolv.conf after every reboot? This guide shows you how to properly configure DNS on Linux using Netplan, nmcli, and systemd-resolved for long-term stability.

VMware

Upgrading VMware ESXi 7.0 to 8.0 via ESXCLI: Fast, Precise, and Minimal Risk

By admin April 12, 2026

Quickly and safely upgrade VMware ESXi 7.0 to 8.0 using the ESXCLI command line. This article covers detailed steps, configuration backups, and common driver troubleshooting.

Network

Linux Security: Implementing DoH and DoT to ‘Stay Hidden’ from ISPs

By admin April 12, 2026

Don't let ISPs know what you're accessing. A detailed guide on encrypting DNS with DoT and DoH on Linux for total privacy protection.

Virtualization

Proxmox HA: The Ultimate System Rescue at 2 AM Without Leaving Your Bed

By admin April 10, 2026

A hands-on guide to configuring Proxmox VE Cluster and High Availability (HA). This solution enables automatic VM recovery during physical server failures, ensuring maximum uptime for businesses.

VMware

Mastering VMware Backup and Restore: Better Safe Than Sorry

By admin April 10, 2026

Learn how to build a robust 3-2-1 VMware backup strategy. This guide clarifies the difference between Snapshots and Backups, and covers using Veeam and GhettoVCB for total data protection.

Linux

Escape ‘Dependency Hell’ on Linux with Nix: The Package Manager That Saved Me at 2 AM

By admin April 10, 2026

Nix Package Manager is a lifesaver for isolating software, supporting instant rollbacks, and completely eliminating library conflict errors on Linux. This guide provides practical installation and usage tips for DevOps and Sysadmins.