How to set custom app name in python sysloghandler

Question

I am working on a python sysloghander to send logs to a centralized syslog server. The code is working but I am facing some issues in customizing the format. Below is the code that I have written. ``` #!/usr/bin/python import logging from logging.handlers import SysLogHandler import subprocess hostname = subprocess.check_output(['hostname', '-f']) logger = logging.getLogger() logger.setLevel(logging.INFO) syslog = SysLogHandler(address=('log.central.log', 514)) formatter = logging.Formatter('%(asctime)s %(name)s: %(levelname)s %(message)s', '%b %e %H:%M:%S') syslog.setFormatter(formatter) logger.addHandler(syslog) logger.info("My Message") ``` Is it possible to add custom tags / variables in the log formatter. I want to add hostname and app_name in their as I have setup central logging server to create log files based on hostname and app_name. App_name can be anything, like I can set app_name to "mysql_communication_log" or "wsgi_log", then on the central server separate files will be…

Accepted Answer

You can make use of `$syslogfacility-text` (see docs) - it allows you to easily filter log messages by predicates.

So, on the client side, it would be smth like:

```
hostname = "stage-server"
formatter = logging.Formatter('{}:%(asctime)s %(name)s: %(levelname)s %(message)s'.format(hostname), '%b %e %H:%M:%S')
```

And in you `rsyslog.conf`:

```
if $syslogfacility-text == 'stage-server' then /var/log/stage-server/my.log
```

Hope that helps.

How to set custom app name in python sysloghandler

Solution

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