Automating File Rotation

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

Replies are listed 'Best First'.
Re: Automating File Rotation by borisz (Canon) on Sep 14, 2004 at 18:58 UTC
use rotatlelogs that comes with your apache. `Usage: rotatelogs <logfile> <rotation time in seconds> [offset minutes + from UTC] or <rotation size in megabytes>` [download] Boris	[reply] [d/l]
Re: Automating File Rotation by ccn (Vicar) on Sep 14, 2004 at 18:45 UTC
Logfile::Rotate	[reply]
Re^2: Automating File Rotation by Anonymous Monk on Sep 14, 2004 at 18:54 UTC
I checked that module out but it only increments the name of the logfile as specified by a counter value. I was hoping to rotate mine based on a time value	[reply]
Re^3: Automating File Rotation by ikegami (Patriarch) on Sep 14, 2004 at 19:22 UTC
So copy the module, rename it, add `use POSIX qw(strftime);`, remove `for($i = $self->{'Count'}; $i > 1; $i--) { $j = $i - 1; $next = "${currn}." . $i . $ext; $prev = "${currn}." . $j . $ext; if ( -r $prev && -f $prev ) { move($prev,$next) ## move will attempt rename for us or croak "error: move failed: ($prev,$next)"; } }` [download] and change `$next = "${currn}.1";` to `$next = "${currn}_" . strfmt('...', localtime);` Here's some time formats friendly to Windows and UNIX shells which are string-sortable: `use POSIX qw(strftime); @t = localtime; $\ = "\n"; print strftime("%Y%m%d%H%M%S", @t); # logfile_20040914151753 print strftime("%Y%m%d-%H%M%S", @t); # logfile_20040914-151753 print strftime("%Y-%m-%d-%H%M%S", @t); # logfile_2004-09-14-151753 print strftime("%Y-%m-%d@%H-%M-%S", @t); # logfile_2004-09-14@15-17-53` [download]	[reply] [d/l] [select]
Re^3: Automating File Rotation by Beechbone (Friar) on Sep 15, 2004 at 10:20 UTC
Log::Dispatch::File::Rolling _Search, Ask, ^Know	[reply]
Re: Automating File Rotation by gaal (Parson) on Sep 14, 2004 at 19:17 UTC
On linux, try the `logrotate` package.	[reply] [d/l]
Re: Automating File Rotation by sintadil (Pilgrim) on Sep 14, 2004 at 19:18 UTC
Does anyone have any idea how I could create a new logfile every n minutes? Most decent Unix systems provide you with a `newsyslog` utility which runs from `cron` or a workalike which does exactly what you want, and often much more. Any decent implementation isn't limited to working with `syslog` logfiles. If you're running on Windows or something ne Unix ... well ... I honestly don't know. You'd need to post more about what sort of logfile you're rotating, any specifics about rotating it, etc. before we could be more detailed in our answers.	[reply] [d/l] [select]
Re: Automating File Rotation by ikegami (Patriarch) on Sep 14, 2004 at 19:43 UTC
To "not really want to read in the time every x seconds" sounds like a unnecessary and valueless optimization to me, since you were talking about doing this at most every minute. In addition to that, if you want to use a formatted date -- and by formatted, I mean anything other than a number of seconds -- you have to figure out how to convert a number of seconds into year, month, ..., second. If you insist: `our $SLEEP_SECS = 5; # Wake up every 5 seconds. our $GET_TIME_SECS = 260; # Resync $time every 2 minutes. my $time = time; my $sleep_count = 0; { ... do stuff that doesn't take too long ... sleep($SLEEP_SECS); if (++$sleep_count $SLEEP_SECS >= $GET_TIME_SECS) { $time = time; $sleep_count = 0; } else { $time += $SLEEP_SECS; } redo; # loop back to start }` [download] That code falls apart if any signals wake up sleep()	[reply] [d/l]
Re: Automating File Rotation by ranjan_jajodia (Monk) on Sep 15, 2004 at 14:01 UTC
On linux you can use cron to change the logfilename. Use a softlink to point to the latest log. Every n minutes create a new file (via cron) and make the softlink to point to the new logfile.	[reply]