tmpfs is a temporary in-memory file system used in Linux to store files directly in RAM instead of on disk. It is designed for fast read/write operations, making it an ideal choice for storing runtime data, temporary files, and volatile information that does not need to persist after reboot. In a Linux server environment, understanding … Read more
Learn the complete subnet ranges for IPv4 Class A, B, and C networks. This guide explains default masks, CIDR notation, address ranges, and practical subnetting examples for networking and cybersecurity professionals. IPv4 addressing remains a foundational concept in networking, security engineering, and system administration. Despite the shift toward IPv6, understanding IPv4 subnet ranges and classful … Read more
Learn how to search file by name in a Linux server using find, locate, and grep commands. Step-by-step examples, best practices, and tips for system administrators. When managing a Linux server, it’s common to search for files by their names whether you’re troubleshooting, locating configuration files, or tracking down logs. Fortunately, Linux offers powerful command-line … Read more
Learn how to convert SSH key to PEM format on Linux using ssh-keygen. Follow this step-by-step guide to safely convert your RSA 4096-bit private key for compatibility with legacy systems and applications. SSH keys are widely used for secure server access, and RSA 4096-bit keys provide strong encryption. In some cases, you may need to … Read more
Learn how to generate a secure SSH RSA 4096-bit key with step-by-step instructions for Linux, macOS, and Windows. Protect your servers and Git repositories with best practices for SSH key management, key permissions, and deployment. Secure Shell (SSH) keys are the backbone of secure remote authentication for servers, cloud services, and version control systems. Among … Read more
Learn how to harden SSH and Access Control Hardening on Ubuntu and openSUSE Linux servers using proven commands, configuration examples, and outputs. Strengthen system security and compliance with best practices for SSH hardening. Key advantages of Access Control Hardening: Comprehensive Access Control Hardening Steps 1. Disable Root Login Root login via SSH is one of … Read more