sysadmin Archives - ITFROMZERO - Share tobe shared!

Comprehensive Guide to Installing and Configuring Wazuh SIEM on CentOS Stream 9

By IT From Zero October 12, 2026

Battle-tested guide to deploying Wazuh SIEM on CentOS Stream 9: from a 5-minute all-in-one setup and firewalld rules to FIM alerts and automatic SSH brute-force IP blocking.

Network

Configuring Macvlan and IPVlan for Docker on Linux: Direct LAN IP Assignment and NAT Bypass

By IT From Zero October 12, 2026

Assigning physical LAN IPs directly to Docker containers completely bypasses conntrack NAT and lowers CPU overhead for VoIP/RTSP. A detailed guide to configuring Macvlan, IPVlan L2, and fixing host-to-container connectivity.

Fedora

Installing Grafana Loki and Promtail on Fedora Server: Centralized Logging, Way Lighter than ELK

By IT From Zero October 11, 2026

A hands-on production guide to deploying Grafana Loki and Promtail on Fedora Server for centralized logging. Highly resource-efficient compared to ELK, using under 400MB of RAM.

Ubuntu

Ubuntu Server Security Auditing with Lynis: Vulnerability Scanning and Practical Hardening

By IT From Zero October 10, 2026

A hands-on guide to installing Lynis on Ubuntu Server, analyzing Hardening Index reports, fixing common security flaws, and automating audits via cron.

Fedora

Configuring systemd-journal-remote on Fedora Server: Centralized Logging over HTTPS mTLS

By IT From Zero October 10, 2026

Eliminate log loss caused by sudden server crashes. A complete step-by-step guide to centralized logging on Fedora Server using systemd-journal-remote over HTTPS mTLS.

VMware

How to Safely Reset a Lost or Forgotten ESXi Root Password

By IT From Zero October 9, 2026

Discover 3 safe ways to recover a lost VMware ESXi 7.0/8.0 root password using an Ubuntu Live USB, vCenter Host Profile, or reinstalling without losing VM data.

VMware

Enable VMware vSphere Quick Boot: Cut ESXi Maintenance Reboot Time by 80%

By IT From Zero October 9, 2026

VMware vSphere Quick Boot allows ESXi to bypass the BIOS/UEFI POST process, slashing reboot times from 15 minutes to under 90 seconds. Learn how to verify compatibility, enable it in vLCM, and troubleshoot real-world issues.

Ubuntu

How to Set Up Two-Factor Authentication (2FA) for SSH on Ubuntu with Google Authenticator

By IT From Zero October 7, 2026

Step-by-step guide to setting up two-factor authentication (2FA) for SSH on Ubuntu with Google Authenticator. Combine SSH keys and TOTP codes for robust server security.

Ubuntu

How to Install and Configure WireGuard VPN Server on Ubuntu: Setting Up a High-Speed Virtual Private Network

By IT From Zero October 7, 2026

A step-by-step guide to building a WireGuard VPN server on Ubuntu. Master Cryptokey Routing, tune MTU to prevent packet bottlenecks, and generate QR codes for quick client setup.

Centos

How to Manage and Limit CPU and RAM on CentOS Stream 9 Using cgroups v2 and systemd Slices

By IT From Zero October 5, 2026

How to handle memory leaks and CPU bottlenecks on CentOS Stream 9. A step-by-step guide to isolating and limiting service resources using cgroups v2 and systemd slices.