[syslog-ng] (U) [Non-DoD Source] Re: Rotate syslog-ng log files

Wed May 30 12:39:09 UTC 2018

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Hello,

So I updated configuration to have following in my conf file:

destination syslog { file("/var/log/syslog-${YEAR}-${MONTH}-${DAY}.log"); };

and syslog-ng restarted file,

But now I see 2 log files in /var/log

Syslog.log

syslog-{YEAR}-{MONTH}-{DAY}.log

Not sure why it’s creating syslog-{YEAR}-{MONTH}-{DAY}.log named file versus actually putting day/month/year in file name. Anything I missed??

Thanks

Jitesh Amin

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From: syslog-ng <syslog-ng-bounces at lists.balabit.hu> On Behalf Of Scheidler, Balázs
Sent: Wednesday, May 30, 2018 8:03 AM
To: Syslog-ng users' and developers' mailing list <syslog-ng at lists.balabit.hu>
Subject: Re: [syslog-ng] (U) [Non-DoD Source] Re: Rotate syslog-ng log files

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Yep, that would give you one logfile every day. It will not care about whether it reached 500mb though. But on the plus side that gives you a trivial way to identify which file holds a specific date, which is pretty cumbersome otherwise.

On May 30, 2018 07:52, "Amin, Jitesh CTR DISA JSP (US)" <jitesh.amin.ctr at mail.mil < Caution-mailto:jitesh.amin.ctr at mail.mil > > wrote:

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Hello,
So here's what currently is configured in our .conf file:

destination syslog { file("/var/log/syslog.log"  perm(0644)); };

what you are saying, is if I want logs to rotate on daily basis, I can just make the above line to read as following:

destination syslog { file("/var/log/syslog-${YEAR}-${MONTH}-${DAY}.log"); };

Thanks
Jitesh Amin

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-----Original Message-----
From: Gergely Nagy <algernon at balabit.com < Caution-mailto:algernon at balabit.com > > 
Sent: Wednesday, May 30, 2018 7:25 AM
To: Amin, Jitesh CTR DISA JSP (US) <jitesh.amin.ctr at mail.mil < Caution-mailto:jitesh.amin.ctr at mail.mil > >; syslog-ng at lists.balabit.hu < Caution-mailto:syslog-ng at lists.balabit.hu > 
Subject: [Non-DoD Source] Re: [syslog-ng] (U) Rotate syslog-ng log files

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Hi!

>>>>> "Amin" == Amin, Jitesh CTR DISA JSP (US) <jitesh.amin.ctr at mail.mil < Caution-mailto:jitesh.amin.ctr at mail.mil > > writes:

    Amin> What we are trying to do is rotate the syslog.log file once it
    Amin> reaches 500 MB (as well as looking into rotating file every 24
    Amin> hours)? Once the log file rotates, it creates a new file named
    Amin> syslog.log.0 and so on..

syslog-ng does not support size-based rotation, you'll have to configure logrotate for that. See the packaging/debian/syslog-ng-core.syslog-ng.logrotate[1] file for an example.

 [1]: Caution-Caution-https://github.com/balabit/syslog-ng/blob/master/packaging/debian/syslog-ng-core.syslog-ng.logrotate < Caution-https://github.com/balabit/syslog-ng/blob/master/packaging/debian/syslog-ng-core.syslog-ng.logrotate > 

With logrotate, the most recent logfile syslog-ng writes to will always be syslog.log, and the rotated files will have different names - depending on the logrotate configuration you use.

For time-based, daily rotation, you can use templates in the destination filename, such as:

destination d_syslog {
  file("/var/log/syslog-${YEAR}-${MONTH}-${DAY}.log");
};

Hope this helps!

-- 
|8]

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