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Full Discussion: Shell script to copy a log file if it exceeds 5000000 bytes
Top Forums Shell Programming and Scripting Shell script to copy a log file if it exceeds 5000000 bytes Post 302484938 by methyl on Monday 3rd of January 2011 05:22:36 PM
Old 01-03-2011
e.g. To null an open file called "logfile" (after copying it of course) using a Shell which is running as a user with sufficient permissions.
Code:
>logfile


On the subject of scheduling, use unix "cron" to schedule routine maintenance tasks. The maintenance frequency depends on the growth rate and local rules.

Most Systems Administrators schedule logfile maintenance weekly on a Sunday night.
Personally I schedule such jobs for 12:00 (lunchtime) daily which gives you a chance to read the overnight logs before your second coffee.
Imho, keeping log files down to a readable size (albeit backed with many days of history) can save you when you need information about a hot problem in a hurry.

Hmm. By this time tomorrow you will know the growth rate ... won't you?


Quote:
TODAY=`date +%d/%m/%y`
CURTIME=`date +%H:%M:%S`
It is not advisible to use characters such as colons and solidi in filenames. It can (and does) confuse multi-platform backup software as well as making subsequent processing in Shell painful. Unix will not stop you creating such filenames because they are valid. The solidus will give you the most grief becuse it is the directory delimiter in the full hierarcial pathname to a file.

This line does not work - there are no variable names preceded with a dollar sign and the "mkdir" command never runs.
Quote:
today_dir=mkdir TODAY_CURTIME
I'll leave that one for you to work out.
Last edited by methyl; 01-03-2011 at 06:40 PM.. Reason: spellin
 

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LEARN ABOUT DEBIAN

cmannotifyd

cmannotifyd(8)						     CMAN Notification Daemon						    cmannotifyd(8)

NAME

       cmannotifyd - CMAN Notification Daemon

SYNOPSIS

       cmannotifyd [-f] [-d]

DESCRIPTION

       The cmannotifyd daemon talks to CMAN and provides a mechanism to notify external entities about cluster changes.

       CMAN dispatches 3 kind of notifications:

       - CMAN_REASON_TRY_SHUTDOWN when cman requests to all clients if it is allowed to shutdown.

       - CMAN_REASON_STATECHANGE when cman detects a node joining or leaving the cluster.

       - CMAN_REASON_CONFIG_UPDATE when a configuration change event has been detected/requested.

       These notifications are then dispatched to the shell script cman_notify in the environment variable CMAN_NOTIFICATION.

       cman_notify will then execute all the scripts in the configured notification directory (default: /etc/cluster/cman-notify.d) passing a very
       minimal set of envvars including, of course, the CMAN_NOTIFICATION= type.  The execution order is set by the filename as shown by "LC_ALL=C
       ls -las".

       cmannotifyd logs are stored in the default log file (/var/log/cluster/cmannotifyd.log).

       cman_notify  logs are stored in the default log file (/var/log/cluster/cman_notify.log). By default the output from the scripts executed by
       cman_notify is redirected to /dev/null.	Users can either set CMAN_NOTIFICATION_DEBUG=1 in their environment or set proper debug configura-
       tion in cluster.conf to redirect scripts output to the cman_notify log file.

NOTES

       cmannotifyd does not block on cman_notify nor check the exit status of the script.

       Notifications are dispatched in the same order as they arrive, one by one.

       CMAN_REASON_TRY_SHUTDOWN  is  passed  to  scripts  for information only, they can not influence cman's decsion about whether or not to shut
       down.

       CMAN_REASON_STATECHANGE also implies CMAN_NOTIFICATION_QUORUM exported in the environment. CMAN_NOTIFICATION_QUORUM will be set to 1  (when
       the node is part of a quorate cluster) or 0 (otherwise).

       A template for cman_notify scripts can be found in the doc/ directory.

OPTIONS

       -f     Run in the foreground (do not fork / daemonize).

       -d     Enable debug output.

								   November 2008						    cmannotifyd(8)
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