root@mongodb1:/opt/aws/opsworks/releases/20141010064749_328/bin# ./chef-shell
loading configuration: none (standalone session)
Session type: standalone
Loading......done.

This is the chef-shell.
 Chef Version: 11.10.4
 http://www.opscode.com/chef
 http://docs.opscode.com/

run `help' for help, `exit' or ^D to quit.

Ohai2u ubuntu@mongodb1.localdomain!
chef > attributes_mode
chef:attributes > node['ec2']['instance_id']
 => "i-c1a98f2c"
chef:attributes > node['opsworks']['instance']['layers']
NoMethodError: undefined method `[]' for nil:NilClass
        from (irb#1):4
chef:attributes >