Cp & skipping exiting files Post: 302962865

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Top Forums Shell Programming and Scripting Cp & skipping exiting files Post 302962865 by Don Cragun on Saturday 19th of December 2015 06:05:21 PM

12-19-2015

Registered User

Sorry... I should have been much more verbose about the environment needed to use a hard link as a backup method.

I once worked in a group where a logging daemon was started when the system booted and ran forever to log errors that would occur. It opened the log files with something like:

Code:

        fd = open(logname, O_CREAT | O_WRONLY, S_IRUSR | S_IRGRP | S_IROTH);

(note that it is opening a file for writing with no write permissions on the file it creates).

If the open() failed with an EPERM error, it looked to see if another daemon is already running (and quietly exited if it was). Otherwise, it incremented that day's log sequence number and tried again.

At midnight, it closed the current log file, opened a new log file for the new day, hard linked any log files created the previous day to a backup directory, and removed any log files in the log directory that were more than a week old (leaving the link in the backup directory untouched).

Another process ran every few days archiving the log files in the backup directory to tape and removing log files more than three months old from the backup directory.

This scheme worked well for that project, but it assumes a lot about how the logs are created and used that is atypical for most loggers today.

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LEARN ABOUT DEBIAN

doveadm-log

DOVEADM-LOG(1)							      Dovecot							    DOVEADM-LOG(1)

NAME

       doveadm-log - Locate, test or reopen Dovecot's log files

SYNOPSIS

       doveadm [-Dv] log errors
       doveadm [-Dv] log find [directory]
       doveadm [-Dv] log reopen
       doveadm [-Dv] log test

DESCRIPTION

       The  doveadm  log commands are used to locate and reopen the log files of dovecot(1).  It's also possible to test the configured targets of
       the *log_path settings.

OPTIONS

       Global doveadm(1) options:

       -D     Enables verbosity and debug messages.

       -v     Enables verbosity, including progress counter.

COMMANDS

   log errors
       doveadm log errors

       The log errors command is used to show the last	- up to 1,000 - errors and warnings.  If no output is generated, no errors  have  occurred
       since the last start.

   log find
       doveadm log find [directory]

       The  log  find  command	is used to show the location of the log files, to which dovecot(1) sends its log messages.  If dovecot(1) logs its
       messages through syslogd(8) and doveadm(1) could not find any log files, you can specify the directory where your syslogd  writes  its  log
       files.

   log reopen
       doveadm log reopen

       This command causes doveadm to reopen all log files, configured in the log_path, info_log_path and debug_log_path settings.  These settings
       are configured in /etc/dovecot/conf.d/10-logging.conf.
       This is for example useful after manually rotating the log files.

   log test
       doveadm log test

       This command causes doveadm to write the message "This is Dovecot's priority log (timestamp)" to the configured log files.  The used prior-
       ities are: debug, info, warning, error and fatal.

EXAMPLE

       This example shows how to locate the log files used by dovecot(1).

       doveadm log find
       Looking for log files from /var/log
       Debug: /var/log/dovecot.debug
       Info: /var/log/mail.log
       Warning: /var/log/mail.log
       Error: /var/log/mail.log
       Fatal: /var/log/mail.log

REPORTING BUGS

       Report  bugs,  including doveconf -n output, to the Dovecot Mailing List <dovecot@dovecot.org>.	Information about reporting bugs is avail-
       able at: http://dovecot.org/bugreport.html

SEE ALSO

       doveadm(1)

Dovecot v2.1							    2012-02-22							    DOVEADM-LOG(1)

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