Run Ethereum in a docker container on your Raspberry Pi

For a project I need to run geth 1.6 in a docker container on my Raspberry Pi that has raspbian jessie installed. I was looking online for such a docker image, but after some searching I gave up and just created my own docker image.

I am using this image as a basis for other docker images that set a geth node up for a private ethereum blockchain. There are a dozen of Ethereum docker images already, but none (that I could find) played nice with the ARM architecture of the rpi.

You can find the prebuild image on dockerhub/askmike/ethereum-raspbian.

Running ethereum in docker on your rpi is as easy as:

docker pull askmike/ethereum-raspbian:latest
docker run -t askmike/ethereum-raspbian:latest

Note that if you are going to use this for anything serious (or if money is involved) always compile from source! The Dockerfile can be found on github/askmike/ethereum-raspbian-docker. It builds on top of an image that installs golang (so geth can be compiled), you can get that from dockerhub/askmike/golang-raspbian (dockerfile on github/askmike/golang-raspbian).

If the images don’t work for you, please post an issue on github :)

Monitoring nodejs apps with Prometheus

Now we’ve set up Prometheus we can very easily start logging interesting metrics from our nodejs app.

The idea is that we will include an external node module in our app, that module will provide easy functions for the by Prometheus supported metric types. In this post we will use the metric types Counter and Gauge. The module will then expose the statistics using a lightweight express server, which Prometheus will scrape.

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Setting up Prometheus on Ubuntu 16.04

Prometheus is a great open source monitoring system by soundcloud. I personally use it on a single server to:

  • Monitor the health on the server
  • Monitor web traffic (nginx)
  • Monitor the backend of my apps (written in nodejs)

In this post I’ll install Prometheus (version 1.1.3) and Promdash (a graphical UI from the same creators).

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What does your computer usage look like?

Yesterday evening I had lots of things today behind my laptop. Wonder how it looks?

IOGraphica

It looks like this! Pure art if you ask me, and most of my evening consisted of programming Action Script for school (see my last post about a homework assignment) and tweaking my new website (see my post about my personal portfolio website). (The big dot in the top left corner was a break by the way).

How do I make this while doing other things on the computer? Well I can tell you it’s true mouse art: Every line and every circle is a made with exact precision with my own mouse. The whole image was made over a time period of almost 3 hours.

The secret is IOGraphica. This little software makes art of your mouse movements.

Leave a comment below and let me know what your computer hours look like!

Posted at November 25, 2010, under sysadmin.

Ghost’s Application Error 27076 while mounting ISO file

ghost application error 27067

I recently tried to restore an image file I made with Symantec Ghost (version 11) to a virtual machine. I have a bootable ISO file with a bootable DOS version of Symantec Ghost 11.0.2 I and the image file itself. I mounted this ISO file directly to the virtual machine as if I put a CD in the virtual tray. I was sure there was nothing wrong with the image file so I googled around a bit.

I found that Symantec has a image verifier, but in my situation the solution is much simpler.

When you mount an ISO file containing a Ghost image file located on your hard disk to your virtualisation software, you have to make sure the ISO file is not located on a NTFS partitioned hard drive (this is the default for the Windows operating system). A simple solution is to burn the ISO to a CD or DVD or to copy the ISO file to a partition formatted FAT.

Posted at October 27, 2010, under sysadmin.