sys.config

[
 %% SASL config
 {sasl, [
         %{sasl_error_logger, {file, "log/sasl-error.log"}},
         {errlog_type, error},
         {error_logger_mf_dir, "log/sasl"},      % Log directory
         {error_logger_mf_maxbytes, 10485760},   % 10 MB max file size
         {error_logger_mf_maxfiles, 5}           % 5 files max
         ]},
 
 {lager, [
          {async_threshold, 20},
          {async_threshold_window, 5},
          
          {handlers, [
                      {lager_console_backend, info},
                      {lager_file_backend, [{file, "error.log"}, {level, error}]},
                      {lager_file_backend, [{file, "console.log"}, {level, info}]}
                     ]}
         ]}
].