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FSCK command

Gunjan — Thu, 27 Oct 2011 15:04:47 +0000

Many time we face the “read only partition” problem on the Linux Server at that time while rebooting the server from KVM, its stuck at maintenance mode and some time auto fsck completed the fsck successfully but after that server ge auto rebooted . We can use the following commands to run the fsck manually.

For example the /dev/sda2 partition having the read only partition error message then run the following command, it will take time as per partiton size

fsck -y -p -v /dev/sda1

e2fsck -y -v -f /dev/sda1

Many time due to big partition size ,we have to wait for the long time at that time we think fsck process is stuck at that time we can use the following fsck command because its showing the % for the fsck process, so that we are able to see how much % fsck is completed and remaining.

fsck -y -p -C0 /dev/sda2

e2fsck -y -C0 /dev/sda2

Now reboot the server in he init 3 run levele

root@server[~]# init 3

Note : Make sure that partition is not mounted while running fsck.

Magento “Fatal error: Undefined class constant ‘XML_PATH_USE_CUSTOM_ADMIN_URL’ “

Gunjan — Tue, 30 Aug 2011 02:05:11 +0000

After upgrading the Magento mostly the following error is occurred.

Fatal error: Undefined class constant ‘XML_PATH_USE_CUSTOM_ADMIN_URL’ in /home/test123/public_html/app/code/core/Mage/Core/Controller/Varien/Router/Admin.php on line 123

Solution : To resolve the above error refer the following steps.

1st take backup for the file /app/code/core/Mage/Adminhtml/helper/Data.php

2nd) Change the following line in the file /app/code/core/Mage/Adminhtml/helper/Data.php

From

class Mage_Adminhtml_Helper_Data extends Mage_Core_Helper_Abstract {protected $_pageHelpUrl;

class Mage_Adminhtml_Helper_Data extends Mage_Core_Helper_Abstract {const XML_PATH_ADMINHTML_ROUTER_FRONTNAME   = ’admin/routers/adminhtml/args/frontName’;
const XML_PATH_USE_CUSTOM_ADMIN_URL         = ’default/admin/url/use_custom’;
const XML_PATH_CUSTOM_ADMIN_URL             = ’default/admin/url/custom’;protected $_pageHelpUrl;

Save the file and delete the Magento cache from the /var/cache directory and now browse the domain

Nameserver IPs not showing in WHM?

Gunjan — Tue, 28 Jun 2011 10:23:11 +0000

In recent cPanel version “Nameserver IPs” section won’t show ips. All ips are present in /etc/nameserverips file but still ips missing.

root@root[~]# cat /etc/nameserverips
198.168.0.1=ns1.test.com
198.168.0.2=ns2.test.com

In that case correct ips entry in the following /var/cpanel/nameserverips.yaml file.

root@root [~]# cat /var/cpanel/nameserverips.yaml
—
ns1.test.com:
“198.168.0.1″: 1
count: 1
zones: test.com
ns2,.test.com:
198.168.0.2: 1
count: 1
zones: test.com

Now check nameserver ips in WHM >> Main >> DNS Functions >> Nameserver IPs.

How to check extenstion available on cPanel server?

Gunjan — Mon, 06 Dec 2010 02:37:46 +0000

We can run following command from shell to check extenstion available on server but make sure that you have logged in as root user.

root@server [~]# /scripts/phpextensionmgr list

It will give followings result.

root@server [~]# /scripts/phpextensionmgr list
Available Extensions:
EAccelerator
IonCubeLoader
Zendopt
SourceGuardian
PHPSuHosin

Joomla “404 component error”?

Gunjan — Tue, 06 Jul 2010 21:32:55 +0000

While browsing Joomla site “404 component error” message refer following steps to resolve issue.

Then select Menus >> Menu Item Manager

Check box “Home” option from list and then only click on the YELLOW star icon in the upper-right corner.

Now browse your site and if you are still having any problem then refer Joomla thread to sort out your issue.

Joomla “Not a valid image” issue?

Gunjan — Mon, 21 Jun 2010 18:31:24 +0000

While uploading images we are receiving “Not a valid image” error message. To resolve error message refer following steps.

First login into Joomla admin section and check box following option.

Global Config > System
– restrict uploads = No
– check mime types = No

Second edit configuration.php file and change.

From

var $ftp_enable = ’1′;

To

var $ftp_enable = ’0′;

Third comment following line in php.ini file if you are using customize php.ini file (mostly used on SuExec server).

;upload_tmp_dir = tmp

And now try to upload the image.

Database sizes shows zero in cPanel?

Gunjan — Sun, 04 Apr 2010 08:37:32 +0000

Once we upgrade from cPanel 11.24 to 11.25 version. We are receiving lots bug. One of them is database size showing zero in cPanel. To resolve this issue you have to edit following file /var/cpanel/cpanel.config

root@support[~]vi /var/cpanel/cpanel.config

Search line “disk_usage_include_sqldbs” in file “ /var/cpanel/cpanel.config “ and change it

From

disk_usage_include_sqldbs=0

disk_usage_include_sqldbs=1

And run script

-/scripts/update_db_cache

How to install Webmin?

Gunjan — Mon, 28 Dec 2009 09:07:59 +0000

You can install webmin by using following steps.

root@gunjan[~]#cd /usr/local/src

root@gunjan[~]#wget http://sourceforge.net/projects/webadmin/files/webmin/1.500/webmin-1.500-1.noarch.rpm/download

root@gunjan[~]#rpm -Uvh webmin-1.500-1.noarch.rpm

warning: webmin-1.500-1.noarch.rpm: Header V3 DSA signature: NOKEY, key ID xxxxx
Preparing… ########################################### [100%]
Operating system is CentOS Linux
1:webmin ########################################### [100%]
Webmin install complete. You can now login to http://server.domain.com:10000/
as root with your root password.

Stop hotlinking from outside domains by using .htaccess?

Gunjan — Fri, 06 Nov 2009 04:18:20 +0000

How to stop hotlinking from outsides domains.

You can stop the hotlinking from outsider domain by using following rule in .htaccess

RewriteEngine On
RewriteCond %{HTTP_REFERER} ^http://(.+.)?domain.com/ [NC,OR]
RewriteCond %{HTTP_REFERER} ^http://(.+.)?domain1.com/ [NC,OR]
RewriteCond %{HTTP_REFERER} ^http://(.+.)?domain2.com/ [NC]
RewriteRule .*.(jpe?g|gif|bmp|png)$ /images/nohotlink.jpe [L]

You can also display a 403 Forbidden Error page instead of an image (nohotlink.jpe)

Replace last line on above code with the following code

RewriteRule .*.(jpe?g|gif|bmp|png)$ – [F]

WordPress default .htaccess file?

Gunjan — Fri, 06 Nov 2009 03:39:14 +0000

The default wordpress .htaccess file code is as follows

# BEGIN wordpress

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_fileNAME} !-f
RewriteCond %{REQUEST_fileNAME} !-d
RewriteRule . /index.php [L]

# END wordpress