hourly log rotation in python / django

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as I checked the Python doc at python logging and with some experiment, I don't quite under stand,

When computing the next rollover time for the first time (when the handler is created), the last modification time of an existing log file, or else the current time, is used to compute when the next rotation will occur.

I found the rotation time for a hourly rotation is affected by the time I start logging, say 12:23:33 starts, and next rotation at 13:23:33, which will finally be confusing to the log file name.

Code would be like ,

TimedRotatingFileHandler(filename, when='h', interval=1, backupCount=0, encoding=None, delay=False, utc=False)

Any way to force the hourly log rotation starts from 00 minute like 13:00:00 rather than the time the logging starts, and every log will contain only the logs within the hour its log file name indicates?

Looking at the code for TimedRotatingFileHandler, you can't force it to rotate at a specific minute value: as per the documentation, the next rollover will occur at either logfile last modification time + interval if the logfile already exists, or current time + interval if it doesn't.

But since you seem to know the filename, you could trick TimedRotatingFileHandler by first setting the last modification time of the logfile to the current hour:

from    datetime import datetime
import  os, time

thishour = datetime.now().replace(minute = 0, second = 0, microsecond = 0)
timestamp = time.mktime(thishour.timetuple())

# this opens/creates the logfile...
with file(filename, 'a'):
    # ...and sets atime/mtime
    os.utime(filename, (timestamp, timestamp))

TimedRotatingFileHandler(filename, ...)

(untested)

Python: How to Create Rotating Logs, You can set it to rotate the log on the following time conditions: second (s); minute (m); hour (h); day (d); w0-w6 (weekday, 0=  This leads to unexpected results such as; multiple log files changing at once, log files containing the wrong timestamped data, truncated logs and missing data. Ouch. Since Django/Python can't be relied on to rotate logs in this scenario we turn to the trusty sysadmin's tonic: logrotate.

I also attach another answer. Python logging support WatchedFileHandler, which will close and re-open log file with same file name if it find file info is updated. It works nicely with system level log rotate like linux logrotate daemon.

15.9. logging.handlers — Logging handlers, A file change can happen because of usage of programs such as newsyslog and logrotate which perform log file rotation. This handler, intended for use under  Django Logging. A Django library that logs request, response and exception details in a JSON document. It uses the python rotation mechanism to rotate the file logs, but the rotation files will be gziped.

    logger = logging.getLogger()

    log_format = '%(asctime)s - %(levelname)s - %(name)s - %(message)s'
    logging.basicConfig(format=log_format, level=level)

    # Create 'log' directory if not present
    log_path = os.path.dirname(logfile)
    if not os.path.exists(log_path):
        os.makedirs(log_path)

    handler = TimedRotatingFileHandler(
        logfile,
        when="H",
        interval=1,
        encoding="utf-8")

    handler.setFormatter(logging.Formatter(log_format))
    handler.extMatch = re.compile(r"^\d{8}$")
    handler.suffix = "%Y%m%d"
    handler.setLevel(level)

    logger.addHandler(handler)

Rotating logs with multiple workers in Django, Since Django/Python can't be relied on to rotate logs in this scenario we turn to the trusty sysadmin's tonic: logrotate. However logrotate has a  A quick logging primer¶ Django uses Python’s builtin logging module to perform system logging. The usage of this module is discussed in detail in Python’s own documentation. However, if you’ve never used Python’s logging framework (or even if you have), here’s a quick primer.

Tips and Tricks for Handling Logging Files in Python, Utilizing the built-in logging module to generate daily log files for debugging logging system that outputs a daily log file for your Flask or Django server. BaseRotatingHandler is the base class for handlers that rotate log  This code is based on an example from the Python Logging Cookbook. Here we create a rotating log with a logging level of INFO. Then we set up the handler to rotate the log whenever the log file is 20 bytes in length. Yes, that’s an absurdly low number, but it makes demonstrating what happens easier.

Overriding Python's TimedRotatingFileHandler to Compress your , This will initialize a rotating logger that will create a log file with `filename` and will create a new file after backing up the old one every 12 hours. Django Logging. A Django library that logs request, response and exception details in a JSON document. It uses the python rotation mechanism to rotate the file logs, but the rotation files will be gziped and it has support for sending the log messages to Elasticsearch. Installation

Django logging, How to log messages in Django, Python core logging concepts, LOGGING The log file is rotated every time a log file reaches 100 MB (i.e. maxBytes ) and old hit the same error, it means 100 email notifications are sent in the same hour. Qiita can be used more conveniently after logging in. We will deliver articles that match you By following users and tags, you can catch up information on technical fields that you are interested in as a whole