Re: [CentOS] rsyslog.conf - why the "-" in this entry? mail.* -/var/log/maillog
Le mar. 05 juin 2012 17:06:32 CEST, Leonard den Ottolander a écrit: > Hello James, > > On Tue, 2012-06-05 at 10:30 -0400, James B. Byrne wrote: > > In dealing with an unrelated issue I came across this in rsyslog.conf. > > > > # The authpriv file has restricted access. > > authpriv.* /var/log/secure > > # Log all the mail messages in one place. > > mail.* -/var/log/maillog > > # Log cron stuff > > cron.* /var/log/cron > > > > Why is there a "-" before /var/log/maillog? > > Better question than it appears at first glance ;) . Nothing in man > rsyslog.conf on C6, but on C5 man syslog.conf it says under "ACTIONS", > "Regular File": > > "You may prefix each entry with the minus ‘‘-’’ sign to omit syncing the > file after every logging. Note that you might lose information if the > system crashes right behind a write attempt. Nevertheless this might > give you back some performance, especially if you run programs that use > logging in a very verbose manner." > > Now whether that minus is still supported under C6 I can't tell you :) . It seems this is no more necessary. From http://www.rsyslog.com/doc/v3compatibility.html : "In rsyslog v3, syncing has been turned off by default." OTOH, it doesn't hurt do let the minus sign in place. -- Philippe Naudin ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] rsyslog.conf - why the "-" in this entry? mail.* -/var/log/maillog
On 06/05/2012 07:30 AM, James B. Byrne wrote: > In dealing with an unrelated issue I came across this in rsyslog.conf. > [...] > Why is there a "-" before /var/log/maillog? [...] A leading '-' indicates the the log is written asynchronously. It is a performance tune to keep writing the syslog from thrashing the system with syncs. See http://www.rsyslog.com/doc/rsyslog_conf_actions.html -- Benjamin Franz ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] rsyslog.conf - why the "-" in this entry? mail.* -/var/log/maillog
Hello James, On Tue, 2012-06-05 at 10:30 -0400, James B. Byrne wrote: > In dealing with an unrelated issue I came across this in rsyslog.conf. > > # The authpriv file has restricted access. > authpriv.* /var/log/secure > # Log all the mail messages in one place. > mail.* -/var/log/maillog > # Log cron stuff > cron.* /var/log/cron > > Why is there a "-" before /var/log/maillog? Better question than it appears at first glance ;) . Nothing in man rsyslog.conf on C6, but on C5 man syslog.conf it says under "ACTIONS", "Regular File": "You may prefix each entry with the minus ‘‘-’’ sign to omit syncing the file after every logging. Note that you might lose information if the system crashes right behind a write attempt. Nevertheless this might give you back some performance, especially if you run programs that use logging in a very verbose manner." Now whether that minus is still supported under C6 I can't tell you :) . Regards, Leonard. -- mount -t life -o ro /dev/dna /genetic/research ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] rsyslog.conf - why the "-" in this entry? mail.* -/var/log/maillog
Le mar. 05 juin 2012 10:30:25 CEST, James B. Byrne a écrit: > In dealing with an unrelated issue I came across this in rsyslog.conf. > > # The authpriv file has restricted access. > authpriv.* /var/log/secure > # Log all the mail messages in one place. > mail.* -/var/log/maillog > # Log cron stuff > cron.* /var/log/cron > > Why is there a "-" before /var/log/maillog? This character is not > present before any of the other log files specified in > /etc/rsyslog.conf. It means that writing to this logfile is not followed by a sync. -- Philippe Naudin ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] rsyslog.conf - why the "-" in this entry? mail.* -/var/log/maillog
On 06/05/2012 09:30 AM, James B. Byrne wrote: > In dealing with an unrelated issue I came across this in rsyslog.conf. > mail.* -/var/log/maillog > Why is there a "-" before /var/log/maillog? man syslog.conf You may prefix each entry with the minus ‘‘-’’ sign to omit syncing the file after every logging. Note that you might lose information if the system crashes right behind a write attempt. Nevertheless this might give you back some performance, especially if you run programs that use logging in a very verbose manner. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] rsyslog.conf - why the "-" in this entry? mail.* -/var/log/maillog
In dealing with an unrelated issue I came across this in rsyslog.conf. # The authpriv file has restricted access. authpriv.* /var/log/secure # Log all the mail messages in one place. mail.* -/var/log/maillog # Log cron stuff cron.* /var/log/cron Why is there a "-" before /var/log/maillog? This character is not present before any of the other log files specified in /etc/rsyslog.conf. I have looked in the documents to discover the purpose of the leading "-" character in the mail log file specification but either I missed the reference or it is not there to be found. -- *** E-Mail is NOT a SECURE channel *** James B. Byrnemailto:byrn...@harte-lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
