Official MongoDB 3.4 on ODROID-C2 under Ubuntu

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I’m a big fan of MongoDB but contrary to its “humongous” orientation, I like to think small as in ARM-based SBCs like the Raspberry Pi or ODROID-C2 and DBs under a terabyte ūüėČ ¬†You can get a lot of power out of tiny inexpensive computers and USB disk drives! ¬†You can find my blog entries, below, for getting 32-bit MongoDB 3.0 working on R-Pi and 64-bit, MongoDB¬†3.2 working under ArchLinux ARM on ODROID-C2.

I had seen MongoDB community requests for a 64-bit ARM version and even a mention that there was “official experimental” development going on – including the efficient WiredTiger storage engine. ¬†I recently perused the MongoDB Community Edition documentation for version 3.4 and saw a download option for “Ubuntu 16.04 Linux 64-bit ARM 64” on the MongoDB Download Center. ¬†Ubuntu 16.04 is the default Linux supplied with the ODROID-C2 ūüôā ¬†You can purchase a bare ODROID-C2 for US$40 at Hardkernel.¬†Micro SD card or EMMC module with preinstalled Ubuntu Linux is extra.

Click more for installation instructions.


CouchDB 2.0 on Raspberry Pi


The Apache Software Foundation has released CouchDB version 2.0. ¬†CouchDB 2.0, is a “distributed” version of CouchDB, a mature¬†NoSQL, document-oriented data-store that is accessable via a RESTful JSON API. Developers can take advantage of CouchDB‚Äôs offline capability and reliable data sync for web, mobile and IoT apps at (any) scale.

Current Raspbian (November 2016) can “apt-get install” version 1.4 and I have previously written about getting CouchDB 1.6 running on the R-Pi. ¬†I have now installed version 2.0.0 on an R-Pi 3 and am sharing the process. ¬†It is pretty straightforward to get CouchDB 2.0 running on the R-Pi. It takes a combination of the R-Pi specific 1.6 install and the “generic linux” 2.0 install to¬†get things running.


R-Pi Clock Radio – Zeroed!


clock_radio_20160909_smallWe had a really old alarm clock in our bedroom. ¬†Really old. ¬†The LED number segments, which were a nice dim red in color, had been dying at the rate of 1 segment a year and it was getting hard to read the time. ¬†My wife finally had enough of my “I’ll get a new one real soon” excuse and bought a new big, bright, blue LED clock to replace the old clock. ¬†It was blue … and *really* bright … even in its dim-mode ūüôĀ ¬†It had to go!

My converted 1942 Crosley Radio was collecting dust on my workbench. ¬†I had¬†finally received a Raspberry Pi Zero and Zero4U USB hub to play with but was already lusting after the new R-Pi Zero with camera port. ¬†I recently upgraded the audio-output on my Mac from an¬†old USB HiFiMan Express DAC to ¬†a Schiit Modi DAC. ¬† Hmmmmm, seemed like I had the ingredients to make¬†a BIG clock “radio” with alarm(s) and great stereo audio?


MongoDB 3.2.10 running under Arch Linux ARM 64 bit



I use MongoDB as my database of choice as you can tell by my blog entries.  Under current Raspberry Pi OSs, MongoDB is limited by 32 bit binaries. Databases are restricted to 2GB.

The Raspberry Pi 3 sports an ARMv7 processor that supports 64 bits. ¬†At this time (May 2016) there is no official OS support for 64 bits. ¬†Raspbian and¬†Arch Linux are only available with 32 bit support. ¬†I expect that we WILL see 64 bit support sometime in the future ūüėČ

While waiting, I looked around and found MongoDB 3.2.6 3.2.10 in the Arch Linux ARM aarch64 package repository.  I also found out that the ODROID C2 single board computer supports aarch64.  This SBC costs $40 and has better specs (for my DB purposes) than the R-Pi 3.  It has a 4-core ARMv8 processor running at 2GHz, 2GB of RAM and gigabit ethernet. It also supports WAY fast eMMC Flash storage in addition to Micro SD.  Android and Ubuntu are the officially supported OSs but Arch Linux ARM (64 bit) can be installed as well.


Using Python with MongoDB on Raspberry Pi 2 & 3

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mongodb plus pythonI’ve written about getting MongoDB running on the Raspberry Pi 2. View my other posts where you can get binaries (3.0.9) or learn how to compile from scratch (3.0.7). The mongo shell works great but you may want/need to code in Python, especially for¬†device control or data logging, etc.

PyMongo is a Python distribution containing tools for working with MongoDB, and is the recommended way to work with MongoDB from Python. You can either use Python 2 or Python 3. Python 3 did not come on the minimal Raspbian Jessie image but can be installed using “sudo apt-get install python3”.

To install the appropriate PyMongo for MongoDB 3.0.x you can do the following from the command line. Note you could use “python3” where I use “python”, depending on your preference. I normally use the default Python 2.7.

Instructions after the break: More

MongoDB 3.0.9 binaries for Raspberry Pi 2 & 3 (Jessie)


I’ve received feedback that some folks are having problems compiling MongoDB 3.0.7 per my instructions AND it takes a long time ūüėČ

MongoDB 3.0.9 just became available but needs¬†quite a few changes to source in order to compile on the Raspberry Pi. ¬†I worked through MongoDB build scripts for ARCH ARM Linux and managed to “translate” for Raspbian (Jessie) Linux on the R-Pi 2. ¬†Rather than creating patch files and writing instructions for building from source, I am providing my compiled binaries. ¬†PLEASE do not post links to my binaries! ¬†Feel free to download for personal use from this site.

NOTE: (08 Mar 2016) I have confirmed binaries and instructions work for the Raspberry Pi 3 using Raspbian Jessie 2016-02-26.

Details are here.


MongoDB 3.0.7 on Raspberry Pi 2!


MongoDB logoI have successfully compiled MongoDB version 3.0.7 and tools on the Raspberry Pi 2. ¬†Full instructions are after the break — click on “more“. ¬†As usual I found great help from the Linux community for getting this to work on ARM7. ¬†mongo, mongod, mongos, and tools¬†are all working great. ¬†The WiredTiger Engine does NOT work under 32-bit ARM but, AFAIK, all other components do ūüôā

NOTE: I have made MongoDB 3.0.9 binaries available for Raspbian (Jesse) for R-Pi 2 – here.


Node.js v4 & v5 on Raspberry Pi 2


Node.jsI had been experimenting with the world of Javascript on the server-side using Node.js. ¬†I “fell off the horse” when Node.js had an identity and direction crisis and io.js was forked. ¬†Node.js and io.js have reunited and the latest supported version is v4.2 with v5.0 just released. ¬†The latest “apt-get” version of Node.js as of¬†15 September 2015 is (something like) 0.6 on Raspbian Wheezy. ¬†Not current enough IMHO. I also wanted to take advantage of the ARMv7 processor in the Raspberry Pi 2. ¬†The best way forward was to figure out how to compile the latest version from source. ¬†NOTE that instructions have been updated for Raspbian Jessie and later versions of node.js.


CouchDB 1.6 on Raspberry Pi


CouchDB_logoPer its website, Apache CouchDB‚ĄĘ is a database that uses JSON for documents, JavaScript for MapReduce indexes, and regular HTTP for its API. ¬†One of its very cool and powerful features is that you can even serve web apps directly out of CouchDB.

CouchDB is available for Raspberry Pi via a simple, “apt-get install couchdb” BUT you’ll be installing version 1.2. ¬†The latest stable version as of 1 September 2015 is 1.6.1. ¬†While 1.6.1 is the latest, I found an excellent how-to for installing 1.6.0 at the blog, “Playing JEE on the Pi“. ¬†The big difference between¬†1.6.0 and 1.6.1 is the fix of an admin password hash issue. ¬†If you are using admin passwords, be aware that start-up under 1.6.0 could be an issue. ¬†I have not yet had time to upgrade the install process for 1.6.1.

In any case, you can find very easy to follow install instructions in an article, “Installing CouchDB 1.6.0 on the Raspberry Pi”¬†on the “Playing JEE on the Pi” blog. ¬†Follow the instructions carefully and you’ll end up with:

pi@Pi-2 ~ $ which couchdb
pi@Pi-2 ~ $ couchdb -V
couchdb - Apache CouchDB 1.6.0

Note: if you have installed an older version of CouchDb using “apt-get” you should uninstall first! ¬†You’ll see a few warnings with the new build and install but everything will install and function correctly. ¬†Failure to uninstall a previous version¬†will result in permission issues and incorrect start-up.

MongoDB on the Raspberry Pi 2


Raspberry Pi 2 After purchasing a Raspberry Pi 2, I decided to move some of my projects to it.  I also added an external 2.5 inch USB drive via a USB hub.  I store various sensor information in a MongoDB database and needed everything to run on the R-Pi 2.  I chose to stick with the well-supported Debian Linux port, Raspbian Wheezy, as opposed to ARCH Linux that I used on my old R-Pi B+, as the R-Pi 2 has a quad core ARMv7 processor that requires a new kernel.

UPDATE¬†(30 January¬†2016): ¬†I’ve compiled MongoDB 3.0.9 and tools for R-Pi 2 Raspbian (Jessie). ¬†Check here.

UPDATE (25 December 2015): Instructions for compiling MongoDB 3.0.7 and tools for R-Pi 2 running Raspbian Jessie are now available.  Check here.

UPDATE (8 November 2015): If you are running Raspbian Jessie, you can “apt-get install mongodb”. ¬†This will result in an install of MongoDB v2.4. ¬†Good enough for most uses and you get a working mongo shell ūüėČ ¬†If you want MongoDB v2.6.3, read-on!

I was back to hunting for a compatible MongoDB binary — or instructions on how to compile from source. ¬†Research showed that MongoDB does not compile for ARM after version 2.6.3 ūüôĀ ¬†Searching the ‘net led me to the “facat’ blog.” This blog shows how to cross-compile MongoDB 2.6.3 for ARM. ¬†Precompiled binaries are also available. ¬†NOTE that the mongo shell does NOT work correctly on the R-Pi. ¬†“mongod”, the server, does work fine and can be accessed programmatically or via a mongo shell from another (non-R-Pi) computer. ¬†I use “mongo” on my Mac to connect to “mongod” running on the R-Pi 2.

more after the break


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