Hard Links to Directories: Why They're Forbidden
Watch what happens when you try to create directory hard links. See infinite loops break filesystem traversal, reference counting cause orphaned directories, and understand why symlinks solve these problems safely.
Linux Boot Process Simulator
Experience step-by-step Linux system startup from hardware POST to desktop login. Simulate real-world boot failures including hardware issues, GRUB problems, kernel panics, and filesystem corruption with hands-on troubleshooting guides.
CoreDNS Autopath Optimization
Experience how CoreDNS autopath reduces DNS queries by 50% and eliminates unnecessary NXDOMAIN responses for external domains. Watch real-time packet flows and see the dramatic performance difference.
Kubernetes PKI Certificate Lab
Interactive Kubernetes PKI troubleshooting lab. Experience realistic certificate expiry scenarios, learn OpenSSL investigation techniques, and practice emergency recovery procedures in a safe simulation environment.
Self-Configuring K3s Infrastructure
Watch infrastructure components discover and configure each other automatically using Pulumi, Proxmox, and runtime dependency resolution. See how modern infrastructure can be truly self-organizing.
kubectl port-forward Deep Dive
An interactive simulation showing exactly how secure tunnels work from your laptop to Kubernetes pods. Understand WebSocket streaming and troubleshoot connection issues by seeing the complete network flow.
Linux NAT Masquerade Deep Dive
Demystify Linux NAT masquerading. See how an iptables POSTROUTING rule rewrites packet headers to solve asymmetric routing and enable internet access for private networks.
Go Concurrency Patterns Interactive Guide
Master Go concurrency step-by-step. Transform slow sequential code into blazing-fast concurrent patterns using goroutines, channels, and production-ready error handling with real performance comparisons.