Apache Tomcat is an implementation of the Java Servlet and JavaServer Pages technologies. It is used as the servlet container for
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XperienCentral and therefore catches all log messages
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that XperienCentral generates. How and where the messages are being logged by Tomcat is determined by
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a system administrator. By default, the main log file is written to
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<Tomcat dir>/logs/catalina.out
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.
However, it is often the case that the log files are being rotated in order to prevent them from getting too big to handle.
Analysis
Log files contain the heartbeat of your
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XperienCentral installation
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therefore keeping an eye on them is a wise idea.
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Below is a
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Linux script to help you analyze the
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catalina.out
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file. It organizes the messages in the logfile and sorts them according to the number of occurrences in the logfile, meaning the most recurring message will end up on top.
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#!/bin/sh |
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# File: |
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prunelog9.sh |
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# Version: |
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1.2 |
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# |
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Author: author # Created: 2009-02-27 |
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# Copyright: |
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copyright (c) 2009 GX, http://www.gxwebmanager.com/ |
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# This program is free software: you can redistribute it and/or modify# it. This program is distributed in the hope that it will be useful,# but WITHOUT ANY WARRANTY; without even the implied warranty of# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.## Description: This script will take a Tomcat catalina.out logfile for WebManager 9# and prune it to unique error messages while sorting it on the number# of occurrences. The result is a sorted list of most occurring errors# on a WebManager 9 installation.## Usage:# prunelog9.sh [ -g ] logfile## Arguments: -g (optional) Generalize error messages## History:# 0.9 OMG! Perl and shell! It's been a while!# 1.0 Works like a charm.# 1.1 Removing stacktraces for better totals# 1.2 Bugfix: Day-of-month can be one or two digits.#if [ $# -eq 1 ]; then LOGFILE=$1...
# This program is free software: you can redistribute it and/or modify # it. This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. # # Description: This script will take a Tomcat catalina.out logfile for WebManager 9 # and prune it to unique error messages while sorting it on the number # of occurrences. The result is a sorted list of most occurring errors # on a WebManager 9 installation. # # Usage: # prunelog9.sh [ -g ] logfile # # Arguments: -g (optional) Generalize error messages # # History: # 0.9 OMG! Perl and shell! It's been a while! # 1.0 Works like a charm. # 1.1 Removing stacktraces for better totals # 1.2 Bugfix: Day-of-month can be one or two digits. # if [ $# -eq 1 ]; then LOGFILE=$1 PERLFILTER='$OUTPUT_AUTOFLUSH = 1;my $outline = "";while (my $line = <STDIN>) { chomp $line; if ($line =~ /^\w{3} \d+, \d{4} \d+:\d+:\d+ \w{2} (.*)$/) { my $leftover = $1; print $outline . "\n"; $outline = $leftover; } else { if (!($line =~ /^\tat /)) { $outline .= " ##### " . $line; } } }' |
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else...
else if [[ "$1" == "-g" ]]; |
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LOGFILE=$2...
then LOGFILE=$2 PERLFILTER='$OUTPUT_AUTOFLUSH = 1;my $outline = "";while (my $line = <STDIN>) { chomp $line; if ($line =~ /^\w{3} \d+, \d{4} \d+:\d+:\d+ \w{2} (.*)$/) { my $leftover = $1; $outline =~ s/\d{5,9}/xxxxxx/g; print $outline . "\n"; $outline = $leftover; } else { if (!($line =~ /^\tat /)) { $outline .= " ##### " . $line; } } }' |
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else...
else echo "Usage: $0 [ -g ] logfile"; |
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exit fifiif [[ ! -f $LOGFILE ]]; then echo "No such file: $LOGFILE" echo "Usage: $0 [ -g ] logfile"; exitfi# Chain the filters together/bin/cat $LOGFILE | \exit fi fi if [[ ! -f $LOGFILE ]]; then echo "No such file: $LOGFILE" echo "Usage: $0 [ -g ] logfile"; exit fi # Chain the filters together /bin/cat $LOGFILE | \ /usr/bin/perl -e "$PERLFILTER" | \ |
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/bin/sort | \ |
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/usr/bin/uniq -c | \ |
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/bin/sort -nr | \ |
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/bin/sed -e "s/ ##### /\n/g" |
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How to make the code above work:
- Copy and paste the code above to a file named "prunelog9.sh"
- Make the file executable: "chmod +x prunelog9.sh"
- Download or copy the logfile you want to analyze, e.g. "catalina.out"
- Usage examples:
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