Samba4 Read-Only DC howto
Have you ever wanted to set up a Samba4-based Read-Only DC in a remote location? Here’s how.
Speeding up Ceph recovery
Note to self: Here’s the command to speed up Ceph recovery by backfilling more than one PG at a time:
ceph tell osd.* injectargs '--osd_max_backfills 16'Processing Prometheus alerts using NodeRED
I’m currently building some home automation stuff using NodeRED. One of the things I need to do is trigger home automation actions from Prometheus: I’m monitoring our Solar panels using it, and I want the shutters to go down whenever it’s sunny outside. I have a Prometheus alert rule that tells me when that is. But how can I trigger NodeRED from there?
As an extra challenge, I wanted to see if I can actually do this without writing a single line of code. I do need a couple more nodes this way, but it works and it’s not all that complicated. Here’s how it’s done.
NodeRED-based MQTT Browser
I’ve recently started building stuff with NodeRED, which I really enjoy. Since I’m using MQTT as the central message bus for my system, I find myself regularly in need of knowing the current state of my MQTT topics. There are a couple of tools around, for instance MQTT.fx, which are specifically built for this purpose; but I found that MQTT.fx likes to cause high CPU load when the topic scanner thingy is running. So I’m looking for an alternative, and I thought, why not build it in NodeRED? So that’s what I did.
Systemd template for Docker containers
Here’s a systemd service template for running Dockerized services, for example the Prometheus Blackbox Exporter.