Chucky - A Distributed and Fault-Tolerant Chuck Norris Facts Disher

Step 1: Figure out your hostname

% hostname -s
imac

Step 2: Configure config/NODE_NAME.config

Here's an example:

[{kernel,
  [{distributed, 
    [{chucky,
      5000,
      ['a@imac', {'b@imac', 'c@imac'}]}]},
   {sync_nodes_mandatory, ['b@imac', 'c@imac']},
   {sync_nodes_timeout, 30000}
  ]}].

Step 3: Compile

% mix compile

Step 4: Run it!

Open 3 different terminals, and on each of them, run these commands:

% iex --sname a -pa _build/dev/lib/chucky/ebin --app chucky --erl "-config config/a.config"

% iex --sname b -pa _build/dev/lib/chucky/ebin --app chucky --erl "-config config/b.config"

% iex --sname c -pa _build/dev/lib/chucky/ebin --app chucky --erl "-config config/c.config"

In each terminal, run:

iex > Chucky.fact
"In a fight between Batman and Darth Vader, the winner would be Chuck Norris."

You can also use Application.started_applications/1 to see where the application is being run on.

Step 5: Watching failover in action

Kill the first session (a@HOSTNAME), then watch b@HOSTNAME get started:

07:33:04.831 [info]  b@manticore starting distributed

07:33:12.025 [info]  Application chucky exited: :stopped

07:33:42.300 [info]  b@manticore starting distributed

Step 6: Watching takeover in action

Start a@HOSTNAME again:

% iex --sname a -pa _build/dev/lib/chucky/ebin --app chucky --erl "-config config/a.config"

Watch a@HOSTNAME take over b@HOSTNAME:

07:39:49.820 [info]  a@manticore is taking over b@manticore