It is an Open-Source tool, which helps us analyze Squid Proxy logs & generates reports in HTML format with all the information from logs presented in nice & easy to understand format.
& It gives information about User’s IP addresses , total & individually used bandwidth etc with access to Daily, Weekly & Monthly reports.
The process for installing sarg on Centos/Redhat is a bit complicated, as it needs to be compiled from source. To do that, firstly we need to install required packages to download & compile the package
$ sudo apt-get install -y gcc lighttpd sarg
Now that’s the installation is complete, we will configure it as per our needs by making changes in configuration file
$ sudo nano /etc/sarg/sarg.conf
Firstly, uncomment the line starting with access_log & add path for squid access log. Next, provide output directory for reports next to line starting with output_dir & also select your desired time format, change line with date_format
# TAG: access_log file
# Where is the access.log file
Add output directory
# TAG: output_dir
# The reports will be saved in that directory
Set the correct date format
# TAG: date_format
# Date format in reports: e (European=dd/mm/yy), u (American=mm/dd/yy), w (Weekly=yy.ww)
& lastly , set overwrite report to yes
# # TAG: overwrite_report yes|no
# yes – if report date already exist then will be overwritten.
# no – if report date already exist then will be renamed to filename.n, filename.n+1
$ sudo mkdir /var/www/html/squid-reports
To create squid analysis report, we have to enter following command
$ sudo sarg -x
Note: It may take a while depending on number of users accessing squid proxy.
To access the report, enter below mentioned URL in web-browser
http://IP-Address of server/squid-reports
Now, we have all the squid analyzed logs in nice, sorted &easy to understand format
Note: you can also create a cron–job to schedule a report being generated automatically at the time of your choosing.
$ sudo crontab -e
Add for example this line at the end
* */4 * * * /usr/bin/sarg -x
This will generate a report every 4th hour.