ubuntu@ip-172-30-0-199:~$ sudo riak start
sudo: unable to resolve host ip-172-30-0-199
sudo: unable to resolve host ip-172-30-0-199
riak failed to start within 15 seconds,
see the output of 'riak console' for more information.
If you want to wait longer, set the environment variable
WAIT_FOR_ERLANG to the number of seconds to wait.
ubuntu@ip-172-30-0-199:~$ sudo riak console
sudo: unable to resolve host ip-172-30-0-199
sudo: unable to resolve host ip-172-30-0-199
Node 'riak@172.30.0.199' not responding to pings.
config is OK
Exec: /usr/lib/riak/erts-5.9.1/bin/erlexec -boot /usr/lib/riak/releases/1.4.10/riak              -config /etc/riak/app.config             -pa /usr/lib/riak/lib/basho-patches             -args_file /etc/riak/vm.args -- console
Root: /usr/lib/riak
Erlang R15B01 (erts-5.9.1) [source] [64-bit] [smp:2:2] [async-threads:64] [kernel-poll:true]

/usr/lib/riak/lib/os_mon-2.2.9/priv/bin/memsup: Erlang has closed.
                                                                   Erlang has closed
                                                                                    {"Kernel pid terminated",application_controller,"{application_start_failure,riak_core,{bad_return,{{riak_core_app,start,[normal,[]]},{'EXIT',{{function_clause,[{orddict,fetch,['riak@172.30.0.199',[]],[{file,[111,114,100,100,105,99,116,46,101,114,108]},{line,72}]},{riak_core_capability,renegotiate_capabilities,1,[{file,[115,114,99,47,114,105,97,107,95,99,111,114,101,95,99,97,112,97,98,105,108,105,116,121,46,101,114,108]},{line,416}]},{riak_core_capability,handle_call,3,[{file,[115,114,99,47,114,105,97,107,95,99,111,114,101,95,99,97,112,97,98,105,108,105,116,121,46,101,114,108]},{line,202}]},{gen_server,handle_msg,5,[{file,[103,101,110,95,115,101,114,118,101,114,46,101,114,108]},{line,588}]},{proc_lib,init_p_do_apply,3,[{file,[112,114,111,99,95,108,105,98,46,101,114,108]},{line,227}]}]},{gen_server,call,[riak_core_capability,{register,{riak_core,vnode_routing},{capability,[proxy,legacy],legacy,{riak_core,legacy_vnode_routing,[{true,legacy},{false,proxy}]}}},infinity]}}}}}}"}

Crash dump was written to: /var/log/riak/erl_crash.dump
Kernel pid terminated (application_controller) ({application_start_failure,riak_core,{bad_return,{{riak_core_app,start,[normal,[]]},{'EXIT',{{function_clause,[{orddict,fetch,['riak@172.30.0.199',[]]