Reverse SSH tunnel and autossh

Charly's Column – Reverse SSH Tunnel

Article from Issue 215/2018
Author(s):

This month, Charly Kühnast draws attention to a widely unknown weather phenomenon: The instability of rarely used tunnels leading to a Raspberry Pi. Read on for greater insights.

Recording environmental data is one of my hobbies; I already reported about my magnificent dust sensor [1]. I also own a small weather station: the popular WH1080, which is sold under names like Fine Offset, Nextrend, Froggit, or TFA Nexus. It includes various external sensors, as well as an indoor base station.

I continually extract the measurement data via the USB port of the base system – any Linux machine would be capable of it, but my old Raspberry Pi 2B is the perfect choice. I use RRDtool to write the data to a round-robin database and conjure up colorful graphs for a web server (Figure 1.)

Figure 1: Charly's Raspberry Pi server records the weather station data with RRDtool.

[...]

Use Express-Checkout link below to read the full article (PDF).

Buy this article as PDF

Express-Checkout as PDF
Price $2.95
(incl. VAT)

Buy Linux Magazine

SINGLE ISSUES
Print Issues
Digital Issues
 
SUBSCRIPTIONS
Print Subs
Digisubs
 
TABLET & SMARTPHONE APPS
Get it on Google Play

US / Canada

Get it on Google Play

UK / Australia

Related content

  • The sys admin's daily grind: sshuttle

    When he doesn't want to deal with OpenVPN version conflicts or congestion control problems during TCP tunneling, Charly catches a ride on sshuttle.

    more »
  • Charly's Column: Corkscrew

    Sys admin columnist Charly never takes a vacation from the Internet. A beach bar with WiFi is quickly found, but it runs a forced proxy, which thinks that the SSH port (22) is in league with the devil and blocks the connection. Time to drill a tunnel.

    more »
  • Charly's Column

    Some weather forecasts give you the temperature and a windchill adjustment, and a similar forecast for bandwidth would be helpful. If you feel the bandwidth is too low – and it always is – you need some kind of measuring instrument to reveal the truth.

    more »
  • LUG Camp 2010

    From the Lower Rhine to Central Franconia, on his journey, Charly found beaten gold, relaxed Linux users, abandoned beer cellars, and a Python one-liner for presentable photos of the tour. A once-in-a-year experience.

    more »
  • Charly’s Column: Raspberry Pi

    It’s probably not a coincidence that a number of people want to write about the muchlauded Raspberry Pi single-board computer, and our regular columnist Charly isn’t going to blow raspberries.

    more »
comments powered by Disqus