Best of Sysadmin — June 2025

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    Article
    Avatar of infosecwriteupsInfoSec Write-ups·48w

    DNS Records

    DNS records serve different purposes in domain name resolution and security. A and AAAA records map domains to IPv4 and IPv6 addresses respectively. CNAME records create domain aliases, while MX records direct email routing. TXT records store security information like SPF, DKIM, and DMARC for email authentication. NS records identify authoritative name servers, SOA records contain zone management data, SRV records specify service locations and ports, and PTR records enable reverse DNS lookups for security validation.

  2. 2
    Article
    Avatar of last9Last9·50w

    A Complete Guide to Linux Log File Locations and Their Usage

    Linux systems store logs primarily in /var/log/ directory using rsyslog and journald mechanisms. Key log files include /var/log/syslog for general system messages, /var/log/auth.log for authentication events, and application-specific logs for services like Apache, MySQL, and SSH. Essential command-line tools like tail, grep, less, and journalctl enable effective log analysis and real-time monitoring. The guide covers log rotation with logrotate, advanced filtering techniques using regular expressions, and systematic troubleshooting approaches for service failures, security incidents, and performance issues.

  3. 3
    Article
    Avatar of freecodecampfreeCodeCamp·49w

    How to Configure Network Interfaces in Linux

    Network interfaces in Linux serve as connection points between the system and networks, enabling communication with other devices and the internet. The guide covers both physical interfaces (Ethernet, Wi-Fi) and virtual interfaces (loopback, bridge, tunnel), explaining how to list available interfaces using commands like `ip link show` and `ifconfig`. It demonstrates configuring static and dynamic IP addresses using NetworkManager's `nmcli` command, temporary configurations with the `ip` command, and setting up network bridges for virtualization environments. Best practices include making configurations persistent, using static IPs for servers, securing unused interfaces, monitoring network status, and keeping network packages updated to maintain system stability and security.

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    Article
    Avatar of dev_worldDev World·51w

    Garuda Linux Cheat Sheet: Essential Commands & Tips

    A comprehensive command reference guide for Garuda Linux users covering essential system management tasks. Includes package management with pacman and AUR, BTRFS snapshot operations with Timeshift, desktop customization tools, kernel management, and troubleshooting commands. Features Garuda-specific utilities like garuda-update for safe system updates with automatic snapshots, performance optimization tools, and boot repair utilities.

  5. 5
    Article
    Avatar of hnHacker News·50w

    theopfr/somo: A human-friendly alternative to netstat for socket and port monitoring on Linux.

    Somo is a Rust-based command-line tool that provides a more user-friendly alternative to netstat for monitoring network sockets and ports on Linux. It features a clean table view, filtering capabilities by protocol/port/IP/program, interactive process killing, and simplified command syntax. The tool can be installed via Debian packages or Cargo, and offers various filtering options to help system administrators and developers efficiently monitor network connections.

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    Article
    Avatar of communityCommunity Picks·48w

    MacRimi/ProxMenux: ProxMenux An Interactive Menu for Proxmox VE Management

    ProxMenux is an interactive command-line management tool for Proxmox VE that simplifies server administration through a menu-driven interface. The tool can be installed with a single bash command and provides an easy way to execute commands and scripts on Proxmox VE 8.x systems. It automatically handles dependencies including bash, curl, wget, jq, whiptail, and python3-venv, with translation support through a Python virtual environment.

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    Video
    Avatar of mentaloutlawMental Outlaw·50w

    How To Roll Your Own Linux Distro

    Cubic is a tool that allows users to create custom bootable Linux ISO images based on Ubuntu or Debian derivatives. The process involves using a chroot environment to modify packages, install custom software, and configure themes. The tutorial demonstrates creating a personalized Linux Mint distribution with LibreWolf browser, custom desktop themes, and development tools like Neovim with NvChad configuration. This approach is particularly useful for creating portable development environments that can boot from USB drives on any computer.

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    Article
    Avatar of theregisterThe Register·47w

    Junior sysadmin’s set off alarms, then crashed the company

    A junior system administrator accidentally triggered a company-wide outage by running an update script that upgraded MySQL from version 4 to 5 without proper supervision. The upgrade failed mid-process, filling disk space and breaking all MySQL-dependent systems. Despite the supervisor initially blaming the junior admin with a disciplinary warning, the CEO intervened after reviewing an incident report, recognizing the failure was due to inadequate supervision rather than the junior's honest mistake. The incident highlighted the importance of proper mentorship and accountability in system administration roles.

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