gavinj.net

A look at PowerDNS, the excellent Poweradmin web interface, and a design for sharing centrally managed zones across several isolated security domains.

My encrypted server was secure right up until it rebooted and waited for a passphrase nobody could type remotely. Dropbear gave me a tiny SSH server inside the initramfs and a safe way to unlock LUKS from elsewhere.

I added sessions, windows and panes to the Gavos console because knowing about tmux is not the same as reaching for it automatically. Here is the short path from GNU Screen muscle memory to a practical tmux workflow.

I started using ShellGPT today with a locally hosted Gemma 4 26B quantized model through Ollama on my RTX PRO 4000 Blackwell workstation. Asking questions in the terminal was fine, but the real value showed up when local AI met the Unix pipeline.

A practical guide to testing and improving Linux network performance for a three-node Elasticsearch cluster fed by two Logstash servers, including NIC bonding, iperf3, ethtool, TuneD, PCP, nmon, and RHEL-specific tooling.