1. roder
  2. riak


riak / README.org

#+OPTIONS: author:nil timestamp:nil

Welcome to Riak.

* Overview
  Riak is a distributed, decentralized data storage system. 
  Below, you will find the "quick start" directions for setting up and
  using Riak.  For more information, browse the following files:
  * README:  this file
  * TODO:    a list of improvements planned for Riak
  * LICENSE: the license under which Riak is released
  * apps/    the source tree for Riak and all its dependencies
  * doc/
    - basic-setup.txt:  slightly more detail on setting up Riak
    - basic-client.txt: slightly more detail on using Riak
    - architecture.txt: details about the underlying design of Riak
    - index.html:       the root of the edoc output of 'make docs'

* Quick Start

  This section assumes that you have copy of the Riak source tree. To get started, you need to:
  1. Build Riak
  2. Start the Riak server
  3. Connect a client and store/fetch data

** Building Riak

   Assuming you have a working Erlang (R13B03 or later) installation,
   building Riak should be as simple as:

   $ cd $RIAK
   $ make all rel

** Starting Riak

   Once you have successfully built Riak, you can start the server with the following commands:

   $ cd $RIAK/rel/riak
   $ bin/riak start

   Now, verify that the server started up cleanly and is working:

   $ bin/riak-admin test

   Note that the $RIAK/rel/riak directory is a complete, self-contained instance of Riak and
   Erlang. It is strongly suggested that you move this directory outside the source tree if you
   plan to run a production instance.

** Connecting a client to Riak

   Now that you have a functional server, let's try storing some data in it. First,
   start up a erlang node using our embedded version of erlang:

   $ erts-<vsn>/bin/erl -name riaktest -setcookie riak
   Eshell V5.7.4  (abort with ^G)

   Now construct the node name of Riak server and make sure we can talk to it:

   (riaktest@example.com)4> RiakNode = riak_util:str_to_node(riak).

   (riaktest@example.com)2> net_adm:ping(RiakNode).
   We are now ready to start the Riak client:

   (riaktest@example.com)2> {ok, C} = riak:client_connect(RiakNode).

   Let's create a shopping list for bread at /groceries/mine:

   (riaktest@example.com)6> O0 = riak_object:new(<<"groceries">>, <<"mine">>, ["bread"]).
   O0 = riak_object:new(<<"groceries">>, <<"mine">>, ["bread"]).

    (riaktest@example.com)3> C:put(01, 1).
    Now, read the list back from the Riak server and extract the value

    (riaktest@example.com)4> {ok, O1} = C:get(<<"groceries">>, <<"mine">>, 1).

     (riaktest@example.com)5> %% extract the value
     (riaktest@example.com)5> V = riak_object:get_value(O1).

     Add milk to our list of groceries and write the new value to Riak:

     (riaktest@example.com)6> %% add milk to the list
     (riaktest@example.com)6> O2 = riak_object:update_value(O1, ["milk" | V]).

     (riaktest@example.com)7> %% store the new list
     (riaktest@example.com)7> C:put(O2, 1).

     Finally, see what other keys are available in groceries bucket:

     (riaktest@example.com)8> C:list_keys(<<"groceries">>).

* Server Management

** Configuration
   Configuration for the Riak server is stored in $RIAK/rel/riak/etc directory. There are two
   - vm.args     
     This file contains the arguments that are passed to the Erlang VM in which Riak runs. The default
     settings in this file shouldn't need to be changed for most environments.

   - app.config
     This file contains the configuration for the Erlang applications that run on the Riak server. 

** Server Control
*** bin/riak
    This script is the primary interface for starting and stopping the Riak server. 

    To start a daemonized (background) instance of Riak:

    $ bin/riak start 

    Once a server is running in the background you can attach to the Erlang console via:

    $ bin/riak attach

    Alternatively, if you want to run a foreground instance of Riak, start it with:

    $ bin/riak console

    Stopping a foreground or background instance of Riak can be done from a shell prompt via:

    $ bin/riak stop 

    Or if you are attached/on the Erlang console:

    (riak@example.com)1> q().

    You can determine if the server is running by:

    $ bin/riak ping

*** bin/riak-admin
    This script provides access to general administration of the Riak server. 

    To join a new Riak node to an existing cluster:

    $ bin/riak start # If a local server is not already running
    $ bin/riak-admin join <node in cluster>

    (Note that you must have a local node already running for this to work)
    To verify that the local Riak node is able to read/write data:

    $ bin/riak-admin test