GIT – My ecommerce site runs using a cluster of Apache web server. The cluster is behind nginx load balancer. I want to merge backend Apache web server log files for statistics purpose. How do I mere web server log files under Linux / UNIX like operating systems using cron jobs?
You need to use logresolvemerge Perl script which is part of AWStats package. The logresolvemerge allows you to get one unique output log file, sorted on date, built from particular sources:
- Act as a log merger for any other log analyzer.
- It can read several input log files.
- It can read .gz/.bz2 log files.
- It can also makes a fast reverse DNS lookup to replace; all IP addresses into host names in resulting log file.
Step #1: Install awstats
Turn on EPEL repo from the Fedora project and use the yum command install awstats package, enter:
# yum -y install awstats
Please note that the perl based log merger script is installed at /usr/share/awstats/tools/logresolvemerge.pl.
Step #2: Grab Logs From All Other Servers / Node
Our sample setup is as follows:
+----------+
| apache1 + 192.168.1.10
+-----+----+
|
+-----+----+
| apache2 + 192.168.1.11
+-----+----+
|
+-----+----+
| apache3 + 192.168.1.12
+-----+----+
|
------------+----------+-----------------------------
| | | LAN
------+ +-------+ +-------------+
Nginx | |mysql1 | | cachingnode |
lb1 | |cluster| | / stats | 192.168.1.20
------+ +-------+ +-------------+
202.54.1.1
Where,
- You need to fetch logs from apache1, apache2, and apache3 nodes.
- You will use caching node to build stats.
First, create a directory to store logs. Type the following commands on cachingnode (192.168.1.20)
# D=/var/logs/clusterlogs
# mkdir -p $D
# mkdir -p $D/raw
# mkdir -p $D/raw/apache{1,2,3}
# mkdir -p $D/reports
Use the rsync command to fetch log files from each server:
# rsync -azv [email protected]:/var/logs/httpd/access_logs* $D/raw/apache1
# rsync -azv [email protected]:/var/logs/httpd/access_logs* $D/raw/apache2
# rsync -azv [email protected]:/var/logs/httpd/access_logs* $D/raw/apache3
Step #3: Merge Log Files
Use logresolvemerge.pl as follows to merge all log files, enter:
# /usr/share/awstats/tools/logresolvemerge.pl $D/raw/apache1/access_logs* $D/raw/apache2/access_logs* \
$D/raw/apache3/access_logs* > $D/raw/merged_access_logs
The above will create a new file called $D/raw/merged_access_logs. You need to use this file to create logs. You can delete the rest of all files:
# rm -f $D/raw/apache1/access_logs*
# rm -f $D/raw/apache2/access_logs*
# rm -f $D/raw/apache3/access_logs*
Step #4: How Do I Generate Graphs With Webalizer?
The Webalizer is a fast, free, web-server log files analysis program. You need to create webalizer configuration file, enter:
# mkdir -p $D/reports/webalizer
# cp /etc/webalizer.conf.sample $D/reports/webalizer/webalizer.conf
Edit config file, enter:
# vi $D/reports/webalizer/webalizer.conf
Update it as follows:
LogFile /var/logs/clusterlogs/raw/merged_access_logs OutputDir /var/www/usage HistoryName /var/logs/clusterlogs/raw/webalizer.hist Incremental yes IncrementalName /var/logs/clusterlogs/raw/webalizer.current HostName cyberciti.biz
Save and close the file. To generate stats, enter:
# webalizer -c $D/reports/webalizer/webalizer.conf
Your reports will be generated and stored at /var/www/usage directory. You can access /var/www/usage using apache server running on cachingnode (http://cachingnode/usage/).
Step #5: How Do I Generate Graphs With AWStats?
AWStats is a free powerful tool that generates advanced web, streaming, ftp or mail server statistics, graphically. This log analyzer works as a CGI or from command line. Once installed edit awstats configuration file, enter:
# vi /etc/awstats/awstats.cyberciti.biz.conf
Update config directives as follows:
LogFile="/var/logs/clusterlogs/raw/merged_access_logs" LogFormat=1 SiteDomain="cyberciti.biz" DirData="/var/www/usage/awstats"
Save and close the file. Type the following command at a shell prompt to generate stats, enter:
# /usr/share/awstats/wwwroot/cgi-bin/awstats.pl -update -config=cyberciti.biz
Cron Job: Fetch Log Files And Generate Stats
Create a shell script as follows using cron jobs:
# vi /etc/cron.daily/fetchapachelogs.sh
Append the code:
#!/bin/bash # Author: Vivek Gite <[email protected]>, under GPL v2.0+ # -------------------------------------------------------------------- D="/var/logs/clusterlogs" # [email protected]:/path/to/log [email protected]:/path/to/log _nodes='[email protected]:/var/logs/httpd/access_logs* [email protected]:/var/logs/httpd/access_logs* [email protected]:/var/logs/httpd/access_logs*' # Set full path with args _rsync="/usr/bin/rsync -az " _mkdir="/bin/mkdir" _rm="/bin/rm" _webalizer="/usr/bin/awstats" _awstats="/usr/share/awstats/wwwroot/cgi-bin/awstats.pl" _merge="/usr/share/awstats/tools/logresolvemerge.pl" # log files and dirs _mergedlog="$D/raw/merged_access_logs" _path="" # Build path and fetch log files [ ! -d "$D/raw" ] && $_mkdir -p "$D/raw" for f in $_nodes do IFS=':' set -- $f n="$D/raw/${1##*@}" [ ! -d "$n" ] && $_mkdir -p "$n" # grab the log file $_rsync "$f" "$n" _path="$_path $n/* " done # Merge it $_merge "$_path" >"$_mergedlog" # Generate webalizer stats [ -f $D/reports/webalizer/webalizer.conf ] && $_webalizer -c $D/reports/webalizer/webalizer.conf &>/dev/null # Generate Awstats too # [ -x $_awstats ] && $_awstats -update -config=cyberciti.biz # Add your other stats commands here ## /path/to/my_stats_app -f "$D/reports/webalizer/webalizer.conf" # Add your other stats commands here # Clean up $_rm -f "$_mergedlog" $_rm -f "$_path"
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