[Twisted-Python] log rotation
Hi
Has anyone used logrotate or simple use a cron job to send a SIGUSR1 to the process?
If I understand the twistd man page properly, the log file will be rotated on SIGUSR1, therefore I'm wont be able to use logrotate to do the rotation?
Thanks -Liming
On Tue, 21 Sep 2004 11:14:38 +0800, Tsai Li Ming mailinglist@ltsai.com wrote:
Hi
Has anyone used logrotate or simple use a cron job to send a SIGUSR1 to the process?
If I understand the twistd man page properly, the log file will be rotated on SIGUSR1, therefore I'm wont be able to use logrotate to do the rotation?
logrotate should rotate twistd logfiles just fine. It shuts down a process, moves its log files around, then restarts it.
Why you'd _want_ to rotate them this way, instead of just letting them automatically be rotated by twistd (which they will be), I dunno. Is there some feature logrotate has that twistd lacks that you're interested in?
Jp
exarkun@divmod.com wrote:
On Tue, 21 Sep 2004 11:14:38 +0800, Tsai Li Ming mailinglist@ltsai.com wrote:
Hi
Has anyone used logrotate or simple use a cron job to send a SIGUSR1 to the process?
If I understand the twistd man page properly, the log file will be rotated on SIGUSR1, therefore I'm wont be able to use logrotate to do the rotation?
logrotate should rotate twistd logfiles just fine. It shuts down a process, moves its log files around, then restarts it.
Why you'd _want_ to rotate them this way, instead of just letting them automatically be rotated by twistd (which they will be), I dunno. Is there some feature logrotate has that twistd lacks that you're interested in?
Jp
When you say twisted will automatically rotate the log files, how does it do that? Will it automatically rotate the log files periodically?
-Liming
Tsai Li Ming wrote:
exarkun@divmod.com wrote:
On Tue, 21 Sep 2004 11:14:38 +0800, Tsai Li Ming mailinglist@ltsai.com wrote:
Hi
Has anyone used logrotate or simple use a cron job to send a SIGUSR1 to the process?
If I understand the twistd man page properly, the log file will be rotated on SIGUSR1, therefore I'm wont be able to use logrotate to do the rotation?
logrotate should rotate twistd logfiles just fine. It shuts down a process, moves its log files around, then restarts it.
Why you'd _want_ to rotate them this way, instead of just letting them automatically be rotated by twistd (which they will be), I dunno. Is there some feature logrotate has that twistd lacks that you're interested in?
Jp
When you say twisted will automatically rotate the log files, how does it do that? Will it automatically rotate the log files periodically?
-Liming
yes, in twisted.python.logfile.LogFile there is an option to __init__ 'rotateLength' that is by default 1000000. So at 100000 bytes, it will rotate the file.
On Sep 21, 2004, at 9:21 AM, exarkun@divmod.com wrote:
logrotate should rotate twistd logfiles just fine. It shuts down a process, moves its log files around, then restarts it.
That's not how it normally works.
Generally one of two strategies is employed: - Move the current log files, then send a signal to the process to tell it to reload its configuration file, which causes it to reopen the logfiles. - Copy the log files, and truncate the old file.
The first option is much nicer, so ideally for integration with logrotate, you would want to install some signal-handler that tells twistd to reopen all its logfiles.
James
James Y Knight wrote:
On Sep 21, 2004, at 9:21 AM, exarkun@divmod.com wrote:
logrotate should rotate twistd logfiles just fine. It shuts down a process, moves its log files around, then restarts it.
That's not how it normally works.
Generally one of two strategies is employed:
- Move the current log files, then send a signal to the process to tell
it to reload its configuration file, which causes it to reopen the logfiles.
- Copy the log files, and truncate the old file.
The first option is much nicer, so ideally for integration with logrotate, you would want to install some signal-handler that tells twistd to reopen all its logfiles.
James
Hi James,
That's what I would thought too.
1. logrotate will rotate the file. (server -> server.1) 2. a signal (usually a HUP) is sent to the process and the process will close the log file's FD. (server.1) 3. Process will reload it's current configuration and write to a new log file. (server)
However, Twisted has its own mechanism of handling log rotation.
Liming
participants (4)
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exarkun＠divmod.com -
James Y Knight -
Jonathan Simms -
Tsai Li Ming