sysadmin – Page 7 – ITFROMZERO

Mastering Fedora Security: Managing System-Wide Encryption with update-crypto-policies

By admin April 23, 2026

Linux encryption management has never been easier. Learn how to use update-crypto-policies on Fedora to tighten TLS and SSH security for an entire enterprise-standard system.

Linux

Say Goodbye to Cron Jobs: Switching to systemd Timers for Superior Task Scheduling

By admin April 22, 2026

Learn to use systemd Timers for Linux task scheduling as a replacement for Cron Jobs. A detailed guide on configuring auto-retries, centralized logging, and resource limits.

Security

Moving from iptables to nftables: Why It’s a Mandatory Step for SysAdmins

By admin April 22, 2026

Iptables is outdated and slow. Discover how nftables optimizes firewall performance, supports IPv4/IPv6 simultaneously, and how to safely migrate your Linux system.

Linux

Boosting Linux Server I/O Performance: noatime and tuned profile Tips

By admin April 22, 2026

A quick guide to optimizing Linux I/O performance by configuring noatime and using tuned profiles to reduce system latency.

Network

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.