[erlang-questions] Changing lager console backend log level

Devangana Tarafdar devangana@REDACTED
Fri Oct 13 16:09:31 CEST 2017


I am having an issue with lager (3.4.0) and am wondering if anyone can
point out if I am doing something wrong:

Basically I want to change the log level for the console backend from the
app config file.

I am starting lager with the following inserted in the config file:

            {handlers, [
               {lager_file_backend, [{file,"/tmp/lager_test.info"}

                {lager_console_backend, [{level,info}]}

            {log_root, "/tmp"}


Is the above syntax for lager_console_backend  correct ?  Lager seems to be
having some problem with the console backend handler. I see this in the log

2017-10-12 15:34:33.405 [error] <0.60.0>@lager_handler_watcher:123 Lager
fatally failed to install handler lager_console_backend into lager_event,
NOT retrying: bad_log_level

2017-10-12 15:34:33.405 [debug] <0.62.0>@lager_handler_watcher:119 Lager
installed handler error_logger_lager_h into error_logger
2017-10-12 15:34:33.435 [debug] <0.47.0> Supervisor gr_param_sup started
gr_param:start_link(gr_lager_default_tracer_params) at pid <0.64.0>
2017-10-12 15:34:33.435 [debug] <0.46.0> Supervisor gr_counter_sup started
gr_counter:start_link(gr_lager_default_tracer_counters) at pid <0.65.0>
2017-10-12 15:34:33.439 [debug] <0.48.0> Supervisor gr_manager_sup started
gr_lager_default_tracer_params, []) at pid <0.66.0>
2017-10-12 15:34:33.439 [debug] <0.48.0> Supervisor gr_manager_sup started
gr_lager_default_tracer_counters, [{input,0},{filter,0},{output,
0},{job_input,0},{job_run,0},{job_time,0},{job_error,0}]) at pid <0.67.0>
2017-10-12 15:34:33.633 [info] <0.7.0> Application lager started on node '
2017-10-12 15:34:33.888 [debug] <0.56.0>@lager_handler_watcher:119 Lager
installed handler lager_backend_throttle into lager_event

I am starting up my tiny test environment as follows:

[dtaraf@REDACTED lager_test_rel-1.0.0]$ erl -name d -setcookie x -config
/usr/pkg/otp/rel/lager_test_rel-1.0.0/lager_test_rel.config -pz
/usr/pkg/otp/lib/lager-3.4.0/ebin -pz /usr/pkg/otp/lib/goldrush-0.1.9/ebin

*Erlang/OTP 17* [erts-6.3] [source] [64-bit] [async-threads:10]

Eshell V6.3  (abort with ^G)

(d@REDACTED)1>  application:start(compiler),ap
(d@REDACTED)2>  lager:status().
Lager status:
File /tmp/lager_test.info (lager_event) at level debug
Console (lager_event) at level {error,bad_module}
Active Traces:
Tracing Reductions:
Tracing Statistics:
  input: 0
 output: 0
 filter: 0

(d@REDACTED)3> application:which_applications().
[*{lager,"Erlang logging framework","3.4.0*"},
 {goldrush,"Erlang event stream processor","0.1.9"},
 {syntax_tools,"Syntax tools","1.6.17"},
 {compiler,"ERTS  CXC 138 10","5.0.3"},
 {stdlib,"ERTS  CXC 138 10","2.3"},
 {kernel,"ERTS  CXC 138 10","3.1"}]

Thanks !

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