Hi, in code below I try to rotate log files if they reach 5000000 limit, but this happens only to every 5 files, ls -althr: -rw-r--r-- 1 root root 977K 2010-01-19 19:03 /var/log/my.log.12 -rw-r--r-- 1 root root 977K 2010-01-19 19:55 /var/log/my.log.10 -rw-r--r-- 1 root root 977K 2010-01-19 20:41 /var/log/my.log.9 -rw-r--r-- 1 root root 977K 2010-01-19 21:30 /var/log/my.log.8 -rw-r--r-- 1 root root 977K 2010-01-19 22:46 /var/log/my.log.7 -rw-r--r-- 1 root root 4.8M 2010-01-20 00:19 /var/log/my.log.11 -rw-r--r-- 1 root root 977K 2010-01-20 00:19 /var/log/my.log.6 -rw-r--r-- 1 root root 977K 2010-01-20 09:17 /var/log/my.log.4 -rw-r--r-- 1 root root 977K 2010-01-20 10:45 /var/log/my.log.3 -rw-r--r-- 1 root root 977K 2010-01-20 12:04 /var/log/my.log.2 -rw-r--r-- 1 root root 977K 2010-01-20 12:59 /var/log/my.log.1 -rw-r--r-- 1 root root 4.2M 2010-01-20 13:26 /var/log/my.log.5 -rw-r--r-- 1 root root 301K 2010-01-20 13:26 /var/log/my.log it writes simultaneously to both my.log.5 and my.log. It is not big problem, but in this way I have only recent files, because they grows quickly Pet from twisted.python import log from twisted.python import logfile from twisted.application import service class MyLog(log.FileLogObserver): def emit(self, logEntryDict): log.FileLogObserver.timeFormat = '%Y-%m-%d %H:%M:%S' log.FileLogObserver.emit(self, logEntryDict) class MyLogService(service.Service): def __init__(self, logName, logDir): self.logName = logName self.logDir = logDir # near 5mb self.maxLogSize = 5000000 def startService(self): # logfile is a file-like object that supports rotation self.logFile = logfile.LogFile( self.logName, self.logDir, rotateLength=self.maxLogSize, maxRotatedFiles=50) #self.logFile.rotate() # force rotation each time restarted self.loclog = MyLog(self.logFile) self.loclog.start() def stopService(self): self.loclog.stop() self.logFile.close() del(self.logFile)