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RethinkDB is a document-oriented database similar to MongoDB but aims to overcome scalability and practical limitation of the latter. [1] [2] RethinkDB is built to store JSON documents, and scale to multiple machines with very little effort. It has a pleasant query language that supports really useful queries like table joins and group by, and is easy to setup and learn.

Installing RethinkDB

Install rethinkdb from the official repositories.

Now you can start `rethinkdb` from the command-line:

# rethinkdb

Or instead you can run it as a `systemd` service. Enable the default `rethinkdb` instance as

# systemctl enable rethinkdb@default

and start it:

# systemctl start rethinkdb@default

RethinkDB's admin UI is now available on port 8080.

Configuring RethinkDB

RethinkDB has multi-instance support, which means you can run several independent database instances on the same machine. The `systemd` service also supports multi-instance configuration.

To create a new RethinkDB instance, create its configuration file:

# cd /etc/rethinkdb
# cp default.conf.sample instances.d/<NAME>.conf

where <NAME> represents the configuration you'll be using later. Change the configuration options in the new config file. Then start the service:

# systemctl enable rethinkdb@<NAME>
# systemctl start rethinkdb@<NAME>

The 'default' instance is created at installation time for your convenience. Its data is stored in `/var/lib/rethinkdb/default`.