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Top Forums Shell Programming and Scripting Log rotation issue with script Post 302472637 by navinmistry on Wednesday 17th of November 2010 05:36:13 PM
Old 11-17-2010
Log rotation issue with script

I have application which to the heavy stdout and I have diverted the stdout to log file.

this log file is writing very heavily and we have a script which rotates the logs.
logic for rotation is smthing like
cp logfile logfile.1
cat /dev/null > logfile

this logic was working fine till we had lesser load coming in logfile but Now there is much stdout going on and after doing a
cat /dev/null > logfile

logfile becomes of size 0 but again shows the same size as was it before.


so what I'm having is
logfile 1GB
after rotation
logfile.1 1GB
logfile 1GB & still appending the data.


I see the FD 1 for the log write is showing the same size as of the file and not coming down.

can you see any issue with this kind of log rotation why it is breaking on heavy IO ( my assumption is that FD 1 is still in blocking mode )
and any suggestion how it can be solved by scripting or othere logic/commands.


Thanks..
Navin
 

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LOGSAVE(8)						      System Manager's Manual							LOGSAVE(8)

NAME
logsave - save the output of a command in a logfile SYNOPSIS
logsave [ -asv ] logfile cmd_prog [ ... ] DESCRIPTION
The logsave program will execute cmd_prog with the specified argument(s), and save a copy of its output to logfile. If the containing directory for logfile does not exist, logsave will accumulate the output in memory until it can be written out. A copy of the output will also be written to standard output. If cmd_prog is a single hyphen ('-'), then instead of executing a program, logsave will take its input from standard input and save it in logfile logsave is useful for saving the output of initial boot scripts until the /var partition is mounted, so the output can be written to /var/log. OPTIONS
-a This option will cause the output to be appended to logfile, instead of replacing its current contents. -s This option will cause logsave to skip writing to the log file text which is bracketed with a control-A (ASCII 001 or Start of Header) and control-B (ASCII 002 or Start of Text). This allows progress bar information to be visible to the user on the console, while not being written to the log file. -v This option will make logsave to be more verbose in its output to the user. AUTHOR
Theodore Ts'o (tytso@mit.edu) SEE ALSO
fsck(8) E2fsprogs version 1.41.11 March 2010 LOGSAVE(8)
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