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Permanently Fix ‘fatal: detected dubious ownership in repository’ with Git safe.directory

By IT From Zero October 19, 2026

Encountering 'fatal: detected dubious ownership in repository' when running Git in Docker or Linux servers? Learn the root cause behind CVE-2022-24765 and 4 secure fixes.

Virtualization

How to Configure KVM Nested Virtualization on Linux: Enable Nested Virtualization for Proxmox, VMware, and OpenStack Labs

By IT From Zero October 18, 2026

Encountering 'KVM acceleration not available' when installing Proxmox or ESXi inside a Linux VM? Here is how to configure KVM Nested Virtualization for nested labs.

Security

Securing Redis Server on Linux: ACLs, TLS, and Preventing Unauthorized Access

By IT From Zero October 18, 2026

By default, Redis lacks strict security protections. This guide walks you through locking down port 6379, enforcing least-privilege access using ACLs, and configuring TLS encryption on Linux to prevent breaches and data theft.

Ubuntu

A Practical Guide to Configuring and Managing AppArmor on Ubuntu: Application Security and Isolation

By IT From Zero October 17, 2026

Comprehensive guide to configuring AppArmor on Ubuntu. Harden Nginx and MySQL, prevent privilege escalation, and isolate services with minimal resource overhead.

Network

How to Install AdGuard Home on Linux: Block Ads Network-Wide and Secure Your Home Network

By IT From Zero October 17, 2026

A complete guide to installing AdGuard Home on Linux. Learn how to resolve systemd-resolved port 53 conflicts, set up encrypted upstream DoH/DoT, and secure your home network.

Security

Guide to Securing MySQL Server on Linux: TLS/SSL, Audit Plugin, and InnoDB Encryption

By IT From Zero October 16, 2026

A step-by-step guide to in-depth MySQL Server security on Linux: encrypting in-transit connections with TLS 1.3, securing data-at-rest with InnoDB Tablespace Encryption, and monitoring queries using Percona Audit Log.

Linux

A Guide to ncdu and duf on Linux: Visual Disk Usage Analysis and Cleanup from the Command Line

By IT From Zero October 16, 2026

Replace legacy df and du tools with ncdu and duf on Linux. Learn how to pinpoint storage hogs, resolve deleted open file locks, and clean up server disks safely.

Network

A Guide to tcpreplay on Linux: Capture, Modify, and Replay Packets to Test Firewalls and IDS/IPS

By IT From Zero October 14, 2026

A practical guide to using tcpreplay and tcprewrite on Linux to replay pcap files, rewrite packet headers, and benchmark or validate Firewalls, Snort, and Suricata.

Linux

Linux ZRAM Guide: Optimize Memory and Speed Up Your System with Compressed Swap

By IT From Zero October 13, 2026

ZRAM sets up a compressed swap partition directly in physical memory, helping Linux servers relieve memory exhaustion and fend off the OOM Killer without disk I/O bottlenecks.

Docker

How to Configure User Namespace Remapping (userns-remap) in Docker

By IT From Zero October 10, 2026

Configuring userns-remap in Docker maps root containers to unprivileged users on the host, eliminating privilege escalation risks and securing your servers.