[Bro] log streams in a bro cluster

Azoff, Justin S jazoff at illinois.edu
Wed Jun 8 05:36:14 PDT 2016

> On Jun 8, 2016, at 4:43 AM, Luis Martin Liras <martin.liras at gmail.com> wrote:
> Hi all,
> I need some help with the logs generated by a Bro Cluster:
> I have 5 bro scripts that run in all workers of my cluster 
> infrastructure. All of them work OK, sending notices to the manager and 
> all the staff, but one of them should create a LOG stream (warnings.log) 
> that I can't find anywhere:
> Log::create_stream(umas::WARN, [$columns=warn_info,$path="warnings"]);
> If I run my script in a single bro installation, all logs and notices 
> seem to work, but I need it working in a cluster infrastructure.
> I expected this Log stream to be sent to the 'logs' directory in the 
> manager, but that log file is not there. Only standard log files 
> (dns.log, http.log, stdout.log, etc) are copied to the 'logs' directory.
> This warnings.log file do not appear either anywhere in the worker, and 
> not error log file is shown, so... I'm lost.
> I anyone can shed some light into this, I would appreciate it.

When are you writing to that log?  Just creating the log stream doesn't create the file until you do a 

    Log::write(umas::WARN, record);

> The other problem I have is the following: My script should open a 
> config file. In a single machine infrastructure this config file is in 
> the same directory of the scripts, and everything work fine. The file is 
> opened and read. However in a cluster infrastructure the file is not 
> opened in the workers. I find that the file is copied by broctl to the 
> worker BUT it is not read when the bro script is running. Anyone can 
> tell me what I'm doing wrong or where should I locate that file in the 
> workers?
> Thank you for any help!!

How are you loading the configuration file?

You should be using something like

    local config_path = fmt("%s/my-config.something", @DIR);

otherwise a relative or absolute path may not be what you expect.

- Justin Azoff

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