[erlang-questions] r21 logger difficulties

Mark Geib <>
Mon Jul 9 19:22:14 CEST 2018

So after some more debugging, it appears that if I use “debug” or “info” in either the sys.config logger config for the logging level, or as the level of log message I see nothing. If I use any of the other levels it appears to work as expected. All the combinations I tried worked as well, i.e. if I set the log level in the config to “notice” and then log with logger:emergency(), it works fine.


> On Jul 9, 2018, at 1:33 AM, Siri Hansen <> wrote:
> Hi Mark, you just missed that the primary log level by default is 'notice', which means that 'info' is rejected by the primary log level check. If you do logger:notice("test message") instead, it should be printed. To even print 'info', set the kernel configuration parameter logger_level to 'info', 'debug' or 'all' in your sys config, or set it in runtime with logger:set_primary_config(level,Level).
> Regards
> /siri
> Den fre. 6. jul. 2018 kl. 20:44 skrev Mark Geib < <mailto:>>:
> I decided to take a look at the new logger in R21, but I am not able to produce any output.
> In my sys.config I have the following:
> {kernel,
>     [{logger,
>       [{handler, default, logger_std_h,
>        #{level => debug,
>          config => #{type => {file,"log/erlang.log"}},
>          formatter => {logger_formatter, #{template => [time," ",pid," ",msg,"\n"]}}}
>       }]
>     }]
>  }
> And in my code I do something like logger:info(“test message”), but I never see any output to the file. I see the file log/erlang.log created, but always empty.
> I must be missing something, but I have read through the docs, quickly.
> Any pointers would be appreciated.
> Mark.
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