Sysadmin

Initial setup of a freshly deployed Linux server is a critical stage. By default, fresh distributions may have vulnerabilities due to standard user accounts, open ports, or disabled firewalls. In this article, we will review a basic security checklist for a Debian/Ubuntu-based server. 1. Connecting and Updating the System First, connect to your server via SSH (usually as user root): ssh root@your_server_ip Once logged in, update the package list and install all pending security updates: ...

A step-by-step guide on installing Caddy on Linux, configuring Caddyfile, serving static sites, and setting up reverse proxy with automatic HTTPS.

A comprehensive practical guide to Linux networking stack tuning: NIC ring buffers (ethtool), kernel backlog queues, TCP socket buffers (rmem/wmem), BDP calculation, and Bufferbloat mitigation.