CouchDB 2.1 on Raspberry Pi (Raspbian Stretch)

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CouchDB 2.1 on R-PiFrom the Apache CouchDB docs:

CouchDB is a database that completely embraces the web. Store your data with JSON documents. Access your documents with your web browser, via HTTP. Query, combine, and transform your documents with JavaScript. CouchDB works well with modern web and mobile apps.

CouchDB also has Fauxton, a native web-based interface built into CouchDB. It provides an interface to the majority of the CouchDB functionality, including the ability to create, update, delete and view documents and configuration parameters.

I’ve already written a blog post for installing CouchDB 2.0 under Rasbian Jessie for Raspberry Pi.  I’m updating my instructions for CouchDB 2.1 and Raspbian Stretch (in addition to Jessie). I’m presenting this “how-to” in coolbook form — i.e. just type in the commands as presented and you should end up with a functional CouchDB install.  For more background and info, check out my previous blog post.

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MongoDB 3.0.14 for Raspbian Stretch

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The main operating system for Raspberry Pi, Raspbian, continues to evolve.  The latest version as of August 2017 is “Raspbian Stretch” — based upon the current stable version of Debian 9.  The previous version was known as “Raspbian Jessie”.  One difference between versions is OpenSSL libraries. OpenSSL is a general purpose cryptography library that provides an open source implementation of the Secure Sockets Layer (SSL).  My previous builds of MongoDB relied on the older library.  As a result, my previous binaries for 3.0.14 and 3.0.9 do not run under Raspbian Stretch.  Given this change as well as other changes to MongoDB source and newer compilers, I could no longer compile MongoDB 3.0.14 with SSL.

After a few source tweaks and use of various compiler flags, I have manged to compile MongoDB core apps and tools.  These binaries do NOT support SSL and only run under Raspian Stretch on a Raspberry Pi 3:

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CouchDB 2.0 on Raspberry Pi

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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’s offline capability and reliable data sync for web, mobile and IoT apps at (any) scale.

[NOTE: September 2017 — CouchDB 2.1 and Raspbian Stretch have been released.  Check out updated instructions in this blog post]

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.

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R-Pi Clock Radio – Zeroed!

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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 🙁  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?

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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)

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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: I have compiled version 3.0.14 and created binaries for Raspbian Jessie for the R-Pi 2 & 3. NEW: I have also created 3.0.14 binaries for the R-Pi 3 running Raspbian Stretch. I have confirmed that the instructions in this blog entry work with the new binaries.]

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MongoDB 3.0.7 on Raspberry Pi 2!

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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 🙂

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

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Node.js v4 & v5 on Raspberry Pi 2

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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.

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CouchDB 1.6 on Raspberry Pi

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CouchDB_logoPer its website, Apache CouchDB™ 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
/usr/local/bin/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

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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 😉  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

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