I wanted to publish a message to an AWS SNS topic from a Node-RED flow using node-red-contrib-aws. The SNS Publish node itself has no field anywhere in its editor to pick or type a topic — no “Topic ARN” box, nothing. I spent a while looking for it before realizing the node simply doesn’t have one, and the value has to arrive on the message instead.
Installing a VM from an ISO through the Proxmox console is slow: boot the installer, click through partitioning, wait for package installation, reboot, then configure networking and users by hand. A cloud-init template skips all of that. You import a pre-built cloud image once, turn it into a Proxmox template, and every clone afterwards boots in seconds with networking, users and SSH keys already in place — set entirely through cloud-init on first boot.
This tutorial covers downloading vpsFree snapshot backups using vpsfreectl, both manually and as an automated cron job — including a couple of gotchas that aren’t obvious from the official docs.
This tutorial sets up a real-time trigger that fires whenever a subscriber confirms their double opt-in on a Listmonk list. Listmonk itself has no outgoing webhook for this event (as of v6.2.0), so we tap into the underlying Postgres database directly using LISTEN/NOTIFY, and pick it up in Node-RED with node-red-contrib-digitaloak-postgresql.
Docker manages its own iptables rules and, by default, exposes published ports to the whole world - firewalld’s zone rules don’t help here, because Docker inserts its own ACCEPT rule ahead of everything else. On top of that, Docker creates a chain called DOCKER-USER specifically so you can hook into it, but if firewalld gets restarted while Docker is running, that chain gets wiped and container access breaks. Here’s how I lock Docker’s exposed ports down to specific IPs using firewalld’s direct rules, on a CentOS7 box running Docker CE.
Keycloak doesn’t offer a built-in way to move a user from one realm to another - the closest thing the admin console gives you is exporting a user and re-importing them elsewhere, which loses role mappings and other relations unless you rebuild them by hand. When I needed to move a handful of users (selected by email domain) from one realm to another, I ended up writing a small PL/pgSQL procedure that does it directly against Keycloak’s Postgres database.
I run a homelab on Proxmox. When I came across OpenClaw — an automated LXC setup script for a browser automation gateway — I wanted to get it running quickly. I pulled the script, ran it, and had a working container in minutes. Convenient. Also a security disaster waiting to happen.
kubectl.nvim is a Neovim plugin that lets you browse and manage Kubernetes clusters directly from your editor — without leaving your coding environment. This guide covers a complete setup from scratch on Ubuntu 24, including Neovim, lazy.nvim as the plugin manager, and kubectl.nvim itself with true color support.
Git-crypt provides transparent encryption for sensitive files within Git repositories, allowing teams to store secrets like API keys alongside public code without exposing them.
Your asciinema recording looks broken: newlines don’t work, old text gets overwritten, or the screen fills with garbage. This simple tutorial shows how to reset the terminal screen mid-recording using scroll stacking. Fix messy casts without starting over - just edit the file!