How to Check Apache Error Log and Access Log file

The purpose of logging in a server is to diagnose some issues. The common way to start the troubleshooting is to look at logs. For apache httpd server, all the log is normally stored at “/var/log/httpd” as below :

    [root@centos62 ~]# ls /var/log/httpd/
    access_log  error_log
    

How to Continuously Check Apache Error Log file :

    [root@centos62 ~]# tail -f /var/log/httpd/error_log
    

Example :

    [root@centos62 ~]# tail -f /var/log/httpd/error_log
    [Thu Feb 16 18:23:08 2012] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
    [Thu Feb 16 18:23:08 2012] [notice] Digest: generating secret for digest authentication ...
    [Thu Feb 16 18:23:08 2012] [notice] Digest: done
    [Thu Feb 16 18:23:09 2012] [notice] Apache/2.2.15 (Unix) DAV/2 PHP/5.3.3 configured -- resuming normal operations
    [Thu Feb 16 19:56:33 2012] [error] [client 192.168.1.52] File does not exist: /var/www/html/favicon.ico
    [Thu Feb 16 23:47:07 2012] [notice] caught SIGTERM, shutting down
    [Sat Feb 18 20:39:26 2012] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
    [Sat Feb 18 20:39:26 2012] [notice] Digest: generating secret for digest authentication ...
    [Sat Feb 18 20:39:26 2012] [notice] Digest: done
    [Sat Feb 18 20:39:27 2012] [notice] Apache/2.2.15 (Unix) DAV/2 PHP/5.3.3 configured -- resuming normal operations
    

How to Continuously Check Apache Access Log file :

    [root@centos62 ~]# tail -f /var/log/httpd/access_log
    

Example :

    [root@centos62 ~]# tail -f /var/log/httpd/access_log
    192.168.1.52 - - [16/Feb/2012:23:03:50 +0800] "GET /adminer/externals/jush/jush.css HTTP/1.1" 304 - "http://192.168.1.44/adminer/adminer/?server=localhost&username=root" "Mozilla/5.0 (Windows NT 5.1; rv:7.0.1) Gecko/20100101 Firefox/7.0.1"
    192.168.1.52 - - [16/Feb/2012:23:03:52 +0800] "GET /adminer/adminer/static/loader.gif HTTP/1.1" 200 673 "http://192.168.1.44/adminer/adminer/?server=localhost&username=root" "Mozilla/5.0 (Windows NT 5.1; rv:7.0.1) Gecko/20100101 Firefox/7.0.1"
    192.168.1.52 - - [16/Feb/2012:23:03:52 +0800] "GET /adminer/adminer/?server=localhost&username=root&database= HTTP/1.1" 200 4739 "http://192.168.1.44/adminer/adminer/?server=localhost&username=root" "Mozilla/5.0 (Windows NT 5.1; rv:7.0.1) Gecko/20100101 Firefox/7.0.1"
    192.168.1.52 - - [16/Feb/2012:23:03:52 +0800] "GET /adminer/adminer/static/plus.gif HTTP/1.1" 200 72 "http://192.168.1.44/adminer/adminer/?server=localhost&username=root&database=" "Mozilla/5.0 (Windows NT 5.1; rv:7.0.1) Gecko/20100101 Firefox/7.0.1"
    192.168.1.52 - - [16/Feb/2012:23:03:56 +0800] "GET /adminer/adminer/?server=localhost&username=root HTTP/1.1" 200 2977 "http://192.168.1.44/adminer/adminer/?server=localhost&username=root" "Mozilla/5.0 (Windows NT 5.1; rv:7.0.1) Gecko/20100101 Firefox/7.0.1"
    192.168.1.52 - - [16/Feb/2012:23:03:56 +0800] "GET /adminer/adminer/?server=localhost&username=root&script=connect HTTP/1.1" 200 109 "http://192.168.1.44/adminer/adminer/?server=localhost&username=root" "Mozilla/5.0 (Windows NT 5.1; rv:7.0.1) Gecko/20100101 Firefox/7.0.1"
    192.168.1.52 - - [16/Feb/2012:23:04:16 +0800] "GET /adminer/adminer/?server=localhost&username=root&status= HTTP/1.1" 200 19629 "http://192.168.1.44/adminer/adminer/?server=localhost&username=root" "Mozilla/5.0 (Windows NT 5.1; rv:7.0.1) Gecko/20100101 Firefox/7.0.1"
    192.168.1.52 - - [18/Feb/2012:20:39:32 +0800] "GET / HTTP/1.1" 200 1394 "-" "Mozilla/5.0 (Windows NT 5.1; rv:7.0.1) Gecko/20100101 Firefox/7.0.1"
    192.168.1.52 - - [18/Feb/2012:20:39:32 +0800] "GET /icons/compressed.gif HTTP/1.1" 200 1038 "http://192.168.1.44/" "Mozilla/5.0 (Windows NT 5.1; rv:7.0.1) Gecko/20100101 Firefox/7.0.1"
    192.168.1.52 - - [18/Feb/2012:20:44:17 +0800] "GET / HTTP/1.1" 200 1394 "-" "Mozilla/5.0 (Windows NT 5.1; rv:7.0.1) Gecko/20100101 Firefox/7.0.1"
    

How to Reset the Directory Manager Password on RHEL 7 / CentOS 7
How to Reset the Directory Manager Password on RHEL 7 / CentOS 7

It is best practice to remember passwords, but because too many passwords, sometimes we forget. We are not encouraged to write the password on any paper or share the password...

How to Find Big Files Size on Linux RHEL/CentOS
How to Find Big Files Size on Linux RHEL/CentOS

As the linux administrator, sometimes we have to identify which files are most take much space in the linux server resulting in low free space. Low disk space can also...

Why Linux users should worry about malware and what they can do about it
Why Linux users should worry about malware and what they can do about it

Don’t drop your guard just because you’re running Linux. Preventing the spread of malware and/or dealing with the consequences of infection are a fact of life when using computers. If...

How to Reset Forgotten Root Password on Linux RHEL 7 / CentOS 7
How to Reset Forgotten Root Password on Linux RHEL 7 / CentOS 7

This short howto will explain the steps to reset a lost root password or to reset a forgotten root password on Linux RHEL 7 or CentOS 7. Basically, we will...

How to Update CentOS or Upgrade CentOS to the Latest Version
How to Update CentOS or Upgrade CentOS to the Latest Version

Recently, the latest version of CentOS 7.3 was released. All users of CentOS 7.0, 7.1 and 7.2 can upgrade their system to the most recent. This quick guide will explain...

How to Change your WordPress Username, Nickname and Display Name in MySQL
How to Change your WordPress Username, Nickname and Display Name in MySQL

After you create an account log in WordPress, you may want to change your WordPress username, as appropriate or due to security reason. However, you can not do this from...

How to Enable SSH Root Login on Ubuntu 16.04
How to Enable SSH Root Login on Ubuntu 16.04

As what we wrote in the previous article on how to allow SSH root on Ubuntu 14.04, after installing a fresh new copy of Ubuntu 16.04 LTS, we find that...

How to Change UUID of Linux Partition on CentOS 7
How to Change UUID of Linux Partition on CentOS 7

UUID (Universally Unique IDentifier) should be unique and it is used to identify storage devices on a linux system. If you cloned a virtual machine from vCenter, the metadata containing...

1 Comment

  • Avatar for Z Z says:

    This is great for a standard configuration. You’ll also want to check your Apache vhost configuration for log file locations if you need to check log files for a specific site if you’re hosting mutiple sites on your server.

Leave a Reply to Maneesh Kushwaha Cancel reply

Your email address will not be published. Required fields are marked *