How to rotate pycherry (Calibre) log files?

G.S. Rashkovich · 04-29-2012, 04:42 AM

Hi all!
How should I rotate calibre_access_log.txt and calibre_error_log.txt under unixes?
Yeah, I know how to use newsyslog/logrotate... But Calibre access server doesn't use new logs after rotation until I stop/start it.
So the question is - should I (well, not me, but newsyslog or whatsaelse:-) send some signal to server? Which signal and to which PID?
Or should I use any other technique?

And, by the way, what to do under M$ Windows?

WBR,
G.S. Rashkovich

kovidgoyal · 04-29-2012, 04:48 AM

echo > log_file

You cannot rotate log files in windows, Windows locks all open files.

G.S. Rashkovich · 04-29-2012, 09:56 AM

Thanks for a quick answer.
But..."echo > log.txt" :-)...Was it a joke?

Once more, Calibre access server doesn't use new logs after rotation until I stop/start it. The same one is with "echo...", of course, plus delete old file.

I asked, how to ROTATE logs. In other words, how to switch to new log file, not how to truncate/delete it.

And the main part of question - how to do it WITHOUT SERVER RESTART.

I didn't mean just delete/truncate log with "echo", "rm", "truncate" etc. It's easy but out of use.
I need logs and just want to rotate them like any other server does. Maybe, with sending signal 15 or signal SIGUSR* or something like it.

Isit possible or should it be possible in future?

itimpi · 04-29-2012, 10:14 AM

As far as I know it is only possible with a server restart. However since that only takes seconds is it really a big issue?

kovidgoyal · 04-29-2012, 11:04 AM

Do I really need to SPELL it out?

cp log.txt archived-log.txt
echo > log.txt

G.S. Rashkovich · 05-04-2012, 04:12 AM

Quote:

Originally Posted by itimpi

As far as I know it is only possible with a server restart. However since that only takes seconds is it really a big issue?

Well, as for me - it's big enough, because ,logs rotated automatically at 3:00am or at <some> Mbytes, and all activity after it lost until I restart calibre manually.

G.S. Rashkovich · 05-04-2012, 04:38 AM

Quote:

Originally Posted by kovidgoyal

Do I really need to SPELL it out?

cp log.txt archived-log.txt
echo > log.txt

Well, you may spell it or cast it or even sing it - but it doesn't work.

Sorry, I'm not a Python programmer, but is it so difficult to write to rotated log file? log() system call works good enough...

kovidgoyal · 05-04-2012, 04:46 AM

Yes, it does. I dont need to be a python programmer to know that. All I need to know is that files on linux are opened by inode number. Which means that the first call to cp will copy the existing log, the second call to echo will truncate the file *without changing its inode number* which means that calibre will continue to write new entries to the truncated file.

04-29-2012, 04:42 AM	#1
G.S. Rashkovich Junior Member Posts: 4 Karma: 10 Join Date: Apr 2012 Device: smartphone on MTK6235 chipset	How to rotate pycherry (Calibre) log files? Hi all! How should I rotate calibre_access_log.txt and calibre_error_log.txt under unixes? Yeah, I know how to use newsyslog/logrotate... But Calibre access server doesn't use new logs after rotation until I stop/start it. So the question is - should I (well, not me, but newsyslog or whatsaelse:-) send some signal to server? Which signal and to which PID? Or should I use any other technique? And, by the way, what to do under M$ Windows? WBR, G.S. Rashkovich Last edited by G.S. Rashkovich; 04-29-2012 at 04:45 AM.

04-29-2012, 09:56 AM	#3
G.S. Rashkovich Junior Member Posts: 4 Karma: 10 Join Date: Apr 2012 Device: smartphone on MTK6235 chipset	Once more, the same question... Thanks for a quick answer. But..."echo > log.txt" :-)...Was it a joke? Once more, Calibre access server doesn't use new logs after rotation until I stop/start it. The same one is with "echo...", of course, plus delete old file. I asked, how to ROTATE logs. In other words, how to switch to new log file, not how to truncate/delete it. And the main part of question - how to do it WITHOUT SERVER RESTART. I didn't mean just delete/truncate log with "echo", "rm", "truncate" etc. It's easy but out of use. I need logs and just want to rotate them like any other server does. Maybe, with sending signal 15 or signal SIGUSR* or something like it. Isit possible or should it be possible in future?

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04-29-2012, 04:48 AM	#2
kovidgoyal creator of calibre Posts: 43,860 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	echo > log_file You cannot rotate log files in windows, Windows locks all open files.

04-29-2012, 10:14 AM	#4
itimpi Wizard Posts: 4,552 Karma: 950151 Join Date: Nov 2008 Device: Sony PRS-950, iphone/ipad (Marvin/iBooks/QuickReader)	As far as I know it is only possible with a server restart. However since that only takes seconds is it really a big issue?

04-29-2012, 11:04 AM	#5
kovidgoyal creator of calibre Posts: 43,860 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Do I really need to SPELL it out? cp log.txt archived-log.txt echo > log.txt

05-04-2012, 04:46 AM	#8
kovidgoyal creator of calibre Posts: 43,860 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Yes, it does. I dont need to be a python programmer to know that. All I need to know is that files on linux are opened by inode number. Which means that the first call to cp will copy the existing log, the second call to echo will truncate the file without changing its inode number which means that calibre will continue to write new entries to the truncated file.

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