fguisso

Funny initial commit messages

This is where it all begins...
Commit committed
Version control is awful
COMMIT ALL THE FILES!
The same thing we do every night, Pinky - try to take over the world!
Lock S-foils in attack position
This commit is a lie
I'll explain when you're older!

webstory

#-*- coding: utf-8 -*-
import subprocess

if __name__ == '__main__':
  ps = subprocess.Popen(['nodejs','ps2.js'], stdin=subprocess.PIPE, stdout=subprocess.PIPE)

  out = ps.communicate(input='http://www.daum.net'.encode())[0]
  print(out.decode('utf-8'))

lsauer

#for an image ("not running container") use save:
docker save <dockernameortag> | gzip > mycontainer.tgz

#for running or paused docker, use export:
docker export <dockernameortag> | gzip > mycontainer.tgz

#load
gunzip -c mycontainer.tgz | docker load

Paraphraser

Recipe: from MQTT to InfluxDB via Node-RED

• 2024-05-16 adds case study explaining how to extract values from topic strings, and how to specify the measurement name in the message payload provided to the "influxdb out" node.
• 2023-12-02 revise graphics to correspond with "influxdb out" node, and explain the pros and cons of InfluxDB 1.8 vs InfluxDB 2.

Introduction

Getting data produced by IoT sensors into a database is practically a mandatory step before effective visualisation (eg dashboards).

This recipe shows you how to get an MQTT payload into an InfluxDB database using three Node-RED nodes. It makes the following assumptions:

caputomarcos

#!/bin/bash
SSH_REDIR_PORT=12345
SSH_D="cloud_sshd"
COMMAND="ssh -R $SSH_REDIR_PORT:localhost:22 $SSH_D -N -f"
pgrep -f "ssh -R $SSH_REDIR_PORT:localhost:22" > /dev/null 2>&1 || (eval $COMMAND && echo $COMMAND)