Support Logging setup Python syslog

Python Syslog

You can send Python logs over syslog using the SyslogHandler. Your syslog daemon such as rsyslog will receive these events and then forward them to Loggly. The advantage of Rsyslog is that it can send TCP events without blocking your application, can optionally encrypt the data, and even queue data to add robustness to network failure. Use this approach for the best reliability and performance on server-side apps. We will automactically parse the JSON formatted logs as JSON fields.

Python Syslog Setup

1. Configure Syslog Daemon

If you haven’t already, run our automatic Configure-Syslog script below to setup rsyslog. Alternatively, you can Manually Configure Rsyslog or Syslog-ng.

curl -O
sudo bash -a SUBDOMAIN -u USERNAME


  • SUBDOMAIN: your account subdomain that you created when you signed up for Loggly
  • USERNAME: your Loggly username

2. Configure Syslog Daemon for UDP Input

Open rsyslog’s configuration file

sudo vim /etc/rsyslog.conf

Uncomment these lines to accept UDP messages on the default port 514.

$ModLoad imudp
$UDPServerRun 514
Python Logs

Restart the rsyslog service so the changes take effect

sudo service rsyslog restart

3. Configure SyslogHandler

Add SyslogHandler to your source file

import logging
import logging.handlers

logger = logging.getLogger('myLogger')

#add handler to the logger
handler = logging.handlers.SysLogHandler('/dev/log')

#add formatter to the handler
formatter = logging.Formatter('Python: { "loggerName":"%(name)s", "asciTime":"%(asctime)s", "pathName":"%(pathname)s", "logRecordCreationTime":"%(created)f", "functionName":"%(funcName)s", "levelNo":"%(levelno)s", "lineNo":"%(lineno)d", "time":"%(msecs)d", "levelName":"%(levelname)s", "message":"%(message)s"}')

handler.formatter = formatter
logger.addHandler(handler)"Test Message")

Run application and send some logs.

4. Verify Events

Search Loggly for events with the logtype as syslog over the past hour. It may take few minutes to index the event. If if doesn’t work, see the troubleshooting section below.


Advanced Python Syslog Options

Troubleshooting Python Logs

  • Wait a few minutes in case indexing needs to catch up.
  • Check if the SyslogHandler configuration is correct
  • Run “sudo tcpdump -i lo -A udp and port 514″ to verify UDP events are being sent to localhost
  • Search or post your own Python logging syslog question in the community forum.
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