Linux

TCPDump

TCPDump deepdive for Linux engineers As a SIEM platform administrator, one of the most invaluable tools in my troubleshooting arsenal is tcpdump. It allows the user to display TCP/IP and other packets being transmitted or received over a network. Despite its simplicity, it is incredibly powerful for debugging complex network issues, monitoring traffic, or simply learning how different protocols behave. Why use tcpdump Real-time packet inspection Lightweight and scriptable No need for a GUI Useful for security auditing and troubleshooting How to install tcpdump On Debian/Ubuntu-based systems:

Tuesday, June 24, 2025 | 2 minutes Read

LVM

Deepdive into LVM (Logical Volume Manager) What is LVM? LVM stands for Logical Volume Manager, a device mapper framework that provides logical volume management for the Linux kernel. LVM allows administrators to create, resize, and delete volumes dynamically, offering more flexibility than traditional partitioning schemes. Why use LVM? Dynamic resizing: Easily resize (extend/reduce) logical volumes without unmounting. Snapshot support: Create point-in-time snapshots for backup or testing. Volume grouping: Aggregate multiple physical devices into a single storage pool. Migration: Move volumes across physical devices live. Flexibility: Logical volumes can span across multiple disks. LVM architecture

Sunday, June 22, 2025 | 2 minutes Read

Logrotate

Mastering Logrotate: The Unsung Hero of Log Management In the trenches of system administration, there’s one silent guardian that keeps your disk space from imploding under a mountain of logs: Logrotate. Whether you’re wrangling logs on a sprawling Kubernetes cluster or just babysitting a single Linux box, Logrotate ensures your logs don’t spiral out of control. In this deep dive, we’ll explore how Logrotate works, why it’s essential, how to configure it like a pro, and how to troubleshoot when it throws a tantrum.

Friday, June 6, 2025 | 4 minutes Read