Tiny Python Syslog Server

pysyslog.py

#!/usr/bin/env python

## Tiny Syslog Server in Python.
##
## This is a tiny syslog server that is able to receive UDP based syslog
## entries on a specified port and save them to a file.
## That's it... it does nothing else...
## There are a few configuration parameters.

LOG_FILE = 'youlogfile.log'
HOST, PORT = "0.0.0.0", 514

#
# NO USER SERVICEABLE PARTS BELOW HERE...
#

import logging
import SocketServer

logging.basicConfig(level=logging.INFO, format='%(message)s', datefmt='', filename=LOG_FILE, filemode='a')

class SyslogUDPHandler(SocketServer.BaseRequestHandler):

	def handle(self):
		data = bytes.decode(self.request[0].strip())
		socket = self.request[1]
		print( "%s : " % self.client_address[0], str(data))
		logging.info(str(data))

if __name__ == "__main__":
	try:
		server = SocketServer.UDPServer((HOST,PORT), SyslogUDPHandler)
		server.serve_forever(poll_interval=0.5)
	except (IOError, SystemExit):
		raise
	except KeyboardInterrupt:
		print ("Crtl+C Pressed. Shutting down.")

data is already the buffer. No need to double-buffer it or you will incur in extra latency. In regards to writing directly into the file, that can surely be done. You might have noticed that this code is 8+ years old, and I havent touched it (or even used it) in a long time. you are more than welcome to suggest a fix ;-)

how many syslogs can it process ? is there a limit

Thanks a lot i used your script!

Hi, I am using this code a lot. But this server is not able to get logs when sending from a python SyslogHandler as shown in the code below

# sending logs to server
import logging
from logging.handlers import SysLogHandler
import time

logger = logging.getLogger()
logger.setLevel(logging.INFO)
logger.addHandler(SysLogHandler(address=('localhost', 514)))

for i in range(20):
    logger.info("Hello World!!!")
    time.sleep(1)

Hi, I am using this code a lot. But this server is not able to get logs when sending from a python SyslogHandler as shown in the code below

# sending logs to server
import logging
from logging.handlers import SysLogHandler
import time

logger = logging.getLogger()
logger.setLevel(logging.INFO)
logger.addHandler(SysLogHandler(address=('localhost', 514)))

for i in range(20):
    logger.info("Hello World!!!")
    time.sleep(1)

Hi, I resolved this issue.
It is working if send logs to "127.0.0.1" instead if "localhost"
So writing logger.addHandler(SysLogHandler(address=('localhost', 514))) solved the issue and logs are sent to python syslog listener

It is working if send logs to "127.0.0.1" instead if "localhost"

The hostname localhost typically resolves to the 127.0.0.1 loopback address, and is reserved for this purpose in RFC 6761 section 6.3. However, not every platform defines the mapping.

It is working if send logs to "127.0.0.1" instead if "localhost"

The hostname localhost typically resolves to the 127.0.0.1 loopback address, and is reserved for this purpose in RFC 6761 section 6.3. However, not every platform defines the mapping.

👍