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Full Discussion: Not able to delete log file
Operating Systems Solaris Not able to delete log file Post 302865195 by Don Cragun on Thursday 17th of October 2013 11:26:43 PM
Old 10-18-2013
The commands:
Code:
>soa.out
>admin.out

deallocate all blocks allocated to those files at that time, but it doesn't close the file descriptors and does not reset the file offset that determines the position in the file where the next data written will be placed by in the processes that are writing to those files.

The next time the process writes something to one of those files, it will write it to the spot in the file just after the last place it wrote into that file. That will not allocate any disk blocks for the bytes in the file you previously deallocated, so what you end up with is known as a holey file which contains unallocated blocks that have never been written. If you try to read data from those blocks (such as by running cat soa.out), those unallocated blocks will appear as though null bytes had been written into those bytes.

If you change the program(s) that are writing those log files to add the O_APPEND flag to the oflag argument to the call to open() that opens the log files, it will reset the position in the log file where it writes data to the current end of file every time it writes to the log file. So, if you clear the log file using >logfile, the next write to the log file will be at the start of the file instead of leaving a huge hole at the start of the file.
 

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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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