DBG Erlang DNS Resolution

dbg.erl

%% Check the default lookup resolution option
inet_db:res_option(lookup).
%% Set the lookup resolution option giving priority to the ERVM dns client
inet_db:set_lookup([dns, native]).

%% Setup DBG (DO NOT USE IT IN PRODUCTION) good to run in the local erl console 
dbg:stop_clear(). % Stop in any case 
dbg:start().    % start application
dbg:tracer().   % create tracer
dbg:p(all, c).  % allow for all process

%% Trace a MFA only one supported at the time run from the top again to trace a new MFA(starting at dbg:stop_clear())
dbg:tpl(inet_db, add_rr, '_', []). % trace inet_db:add_rr function in any arity 

% stop the tracer
dbg:stop_clear().

% Example
dbg:tpl(M, F, A, [{'_', [], [{return_trace}]}]). 

% Other DNS examples 
dbg:tpl(inet_db, do_add_rr, '_', []).
dbg:tpl(inet_db, add_rr, '_', []).
dbg:tpl(inet_db, res_cache_answer, '_', []).
dbg:tpl(inet_res, res_getby_query, '_', []).
dbg:tpl(inet_res, res_query, '_', []).
dbg:tpl(inet_db, res_hostent_by_domain, '_', []).


dbg:tpl(inet_db, cache_rr, '_', []).



inet:getaddr("dynamodb.us-west-2.amazonaws.com",inet).