How to analyze web server logs

Moebuntu · Sep 15, 2016

I am new to hosting sysadmin and web system analytis, my website is running as well but i feel its having problems with codes or server configs. I want to know how to analyze web server logs to fix problems for my web hosting and web systems. Can anyone share me any tips?

VirtuBox · Sep 15, 2016

Hello Moebuntu, at first what do you use to host your website ? Apache ? Nginx ? cPanel ? Plesk ?
Because logs are not stored in the same place depending what you are using.

Moebuntu · Sep 16, 2016

I am using Apache web server, I tried to view logs file and found hundreds of lines in each log file.
Do I need to learn web server or web system to analyze and fix problems from web server logs?

LJSHost · Sep 16, 2016

To analyze web server logs you need to know what your looking for. What problems are you experiencing ?

racksandcloud · May 20, 2017

You can check the apache logs, MySQL logs, installation logs, /var/log/messages or dmesg and etc to analyze the issue of your server but you should be familiar with these logs/system administration to understand the issues from these logs. You may buy a dedicated or VPS with server management plan if you are not much familiar with system administration.

24x7CSM · May 24, 2017

The output you get in the logs are not all errors , some are warnings. So make sure you are going through it carefully fixing the things. The apache error logs is not only the place where you should looks for as if you are running PHP website , you need to make sure you have enabled all the required PHP extensions , have compiled them with apache. PHP.ini is where you can configure the additional things.

HostechSupport · Jul 31, 2018

Mostly, in Linux or UNIX system, logs are created under /var/log directory, you may see very important log files such as apache, auth, mysql, kernel, bootstrap, dmeg, apt and etc.

Application log

The Application log comprises events logged by applications or programs. say for eg. a database program might record a file error in the application log.

Apache: /var/log/apache

Samba: /var/log/samba

Mail: /var/log/

Mysql: /var/log/

hostguy · Dec 21, 2021

You can use below command to check Apache logs:
cat /var/log/apache2/error_log
This command will open complete file with error logs.

But if you want to search for particular user or something then you can add grep in this command like this:
cat /var/log/apache2/error_log | grep "user"

How to analyze web server logs

Moebuntu

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