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Full Discussion: Script to monitor log file
Top Forums Shell Programming and Scripting Script to monitor log file Post 302612043 by Shirishlnx on Saturday 24th of March 2012 11:08:32 AM
Old 03-24-2012
Script to monitor log file
Hi,

Have written a script to monitor linux non standard log file based on line numbers, so each check store $otalinenum ..

then in next check after 10 minutes it compre the current_total_line_num > last_total_line_num then it will parse the log file from last_total_line_num to current_total_line_num with sed as below
Code:
if [ $current_total_line_num -gt $last_total_line_num ]
then
  sed -n ''$oldln','$totl'p;'$totl'q' log-file | grep -i shirish
else 
  grep -i shirish log-file
fi

But here am facing problem if someone truncate the log file or delete some lines from them .. insted normal log rotation then my script parse the entire log file ((with else above)) insted from new updates ..

Please help me with logic to avoid old log alerts when file truncate happen ...
Code:
# cat -n log-file
1 a1 shirish abc anf 
2 a2 shukla anf 
3 a3 shirish anf fd

## After truncate
Code:
# cat -n log-file
1 a1 shirish abc anf 
2 a3 shirish anf fd


--Shirish Shukla
Last edited by Franklin52; 03-24-2012 at 12:30 PM.. Reason: Please use code tags for data and code samples, thank you
 

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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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