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What is this MongoDB?

An increasingly popular, document-oriented database that you can read about here.

Installing MongoDB on Ubuntu

And here's the catch because, at the moment, the current release of MongoDB has a shared library issue. So you can try to install MongoDB the normal way and, if that works, you're good to go. If not, you have to do a bit more work.

Installing the normal Ubuntu package

To install the standard package:

$ sudo apt-get install mongodb

and if you can run the following and it works, you're good:

$ mongo

However, as of right this minute, this is what happens with that normal package:

$ mongo
mongo: error while loading shared libraries: libmozjs.so: \
  cannot open shared object file: No such file or directory
$

This is a known issue so, if you run into that, purge that package and continue on to the next section.

Installing the MongoDB snapshot

If the normal MongoDB package doesn't run (or you want to keep up with the regular package snapshots), here's the recipe:

$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv 7F0CEB10
$ sudo apt-add-repository \
  "deb http://downloads.mongodb.org/distros/ubuntu 10.4 10gen"
$ sudo apt-get update
$ sudo apt-get install mongodb-snapshot

At this point, barring any other weirdness, you should be able to:

$ mongo
MongoDB shell version: 1.5.4-pre-
connecting to: test
>

and just type "Ctl-D" to exit the MongoDB shell.

The MongoDB Upstart scripts

How to control the execution of the mongod server process:

$ sudo status mongodb
$ sudo stop mongodb
$ sudo start mongodb
$ sudo restart mongodb

More coming shortly ...

... on what to actually do with this package. For now, just get it installed and working.