Raspberry Pi Raspberry Pi
We 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 🙁 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?
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 😉
While waiting, I looked around and found MongoDB
3.2.6 3.2.9 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.
Raspberry Pi database, mongodb, Raspberry Pi
I’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
Raspberry Pi mongodb, Raspberry Pi
I’ve received feedback that some folks are having problems compiling MongoDB 3.0.7 per my instructions AND it takes a long time 😉
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.
Raspberry Pi mongodb, Raspberry Pi
I 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 🙂
NOTE: I have made MongoDB 3.0.9 binaries available for Raspbian (Jesse) for R-Pi 2 – here.
Raspberry Pi CouchDB, database
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.
Raspberry Pi database, mongodb, Raspberry Pi
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 😉 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 🙁 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
Unfortunately, I am hearing reports that MathTerms does not run under iOS 8. I had tested it with prerelease versions of iOS but it fails to load and run under the latest iOS 8.0.2. I am investigating and looking to fix…
In the meantime, I have suspended downloads from iTunes.
Unfortunately, I have not found a “quick-fix” for MathTerms for iPad. I would really like to rewrite and enhance much of it, to enable working on iPhones as well as iPads. Alas, I do not currently have the time to do this. My day-job is taking all my time and energy.
I’ll try to work on a new version during the holiday season. No guarantees 🙁
Raspberry Pi mongodb, nodejs
A while back, I compiled mongoDB 2.1 for Raspberry Pi based upon instructions found on other sites and kind work by developers sharing code on Github. I acquired a Raspberry Pi B+ and tried to compile mongoDB as I had done previously. I quickly found out that the (old) compiled version (2.1.1) no longer functions under Raspbian.
I had also been trying out Arch Linux for R-Pi as it was “lighter” and did not include all the GUI/X components that I don’t use. I use R-Pi for more server centric things and use frame buffer apps for video and images (omxplayer, fbi, fim).
I saw a comment to a posting when Googling for new info for mongoDB on R-Pi. It said, simply, “use Arch Linux”. So I did! I had a little trouble getting Arch Linux to run on the B+ but after a firmware update obtained by a “pacman -Syu” on a R-Pi model B, I could now boot and use Arch Linux on the R-Pi B+ 🙂
My effusive thanks go to the Arch Linux Package maintainers!