LinuxHostingSupport

Error:

Cannot start session without errors, please check for errors in your PHP and/or webserver log file, and configure your PHP installation correct.

You receive the error message “Cannot start session without errors” while accessing phpMyAdmin in cPanel. phpMyAdmin will not work if any of the following settings are incorrect on a cPanel server.

1. The owner and group of /var/cpanel/userhomes/cpanelphpmyadmin directory should be cpanelphpmyadmin recursively as by default phpMyAdmin sessions are written under /var/cpanel/userhomes/cpanelphpmyadmin/sessions/ directory.

chown cpanelphpmyadmin /var/cpanel/userhomes/cpanelphpmyadmin -R
chgrp cpanelphpmyadmin /var/cpanel/userhomes/cpanelphpmyadmin -R

The 1st step should fix the issue but if it doesn’t follow the next 2 steps:

2. Change the session.save_path parameter to /tmp in the file /usr/local/cpanel/3rdparty/etc/phpmyadmin/php.ini i.e. edit the file

pico /usr/local/cpanel/3rdparty/etc/phpmyadmin/php.ini

change session.save_path as below

session.save_path = /tmp

3. The /tmp directory permissions should be 1777, not 755.

chmod 1777 /tmp

You may receive the error message while starting a VPS on OpenVZ server.

vzquota : (error) Quota getstat syscall for id 101: Inappropriate ioctl for device
vzquota init failed [3]

This is a typical Quota error message on OpenVZ servers while starting a VPS. The message indicates that you need to initialize quota on the VPS. You can follow the below steps to correct the issue

rm -f /var/vzquota/quota.101
vzquota drop 101
vzctl start 101

where, 101 is the VPS ID.

If you continue to receive the same error message while starting the VPS,

1. Make sure the server is booted with the OpenVZ kernel, you can check that out using

uname -a

2. The vz service is online.

service vz status

if not, restart the vz service

service vz start

Once you confirm the above two things, start the vps again with the vzctl command.

How to redirect a website using .htaccess?

Redirect website http://mydomain.com to http://www.mynewdomain.com

RewriteEngine on
RewriteCond %{HTTP_HOST} ^mydomain\.com$
RewriteRule ^(.*)$ http://www.mynewdomain.com [R=301,L]

Redirect website mydomain.com with and without www requests to http://www.mynewdomain.com

RewriteEngine on
RewriteCond %{HTTP_HOST} ^www\.mydomain\.com$ [OR]
RewriteCond %{HTTP_HOST} ^mydomain\.com$
RewriteRule ^(.*)$ http://www.mynewdomain.com [R=301,L]

Redirect requests from http://mydomain.com to http://mydomain.com/subdirectory i.e. redirecting requests from main domain to a sub-directory.

RewriteEngine on
RewriteCond %{HTTP_HOST} ^www\.mydomain\.com$ [OR]
RewriteCond %{HTTP_HOST} ^mydomain\.com$
RewriteRule ^(.*)$ http://www.mydomain.com/subdirectory/ [R=301,L]

Redirect all http (80) requests of a domain to https (443) i.e. redirecting requests from non-secure port to a secure port.

RewriteEngine On
RewriteCond %{SERVER_PORT}      !443
RewriteRule ^(.*)$ https://mydomain.com/$1 [R,L]

The e-mail address postmaster@mydomain.com deleted successfully.
Sorry, you do not have access to the domain mydomain.com

The error message is displayed when you delete an email account of a domain from cPanel >> ‘Email Accounts’ that is either shifted under another users account OR usually happens when a domain is swapped from add-on domain to main domain OR vice-versa. You cannot delete an email account from cPanel, and in this case, you have to manually remove the email account entries for domain from the existing account.

The files you need to remove the entries from are

/home/user/etc/domainname.tld/passwd
/home/user/etc/domainname.tld/shadow
/home/user/.cpanel/email_accounts.yaml

The directory that need to be removed is

/home/user/mail/mydomain.com

where, ‘user’ is the one under who’s account the email address of ‘mydomain.com’ exist.

How to install Zend Optimizer on a cPanel server?

cPanel offers ‘phpextensionmgr’ script through which you can install various extensions. To list the available PHP extensions, execute the command as root

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

To list the available Options and Actions, execute

root@server [~]# /scripts/phpextensionmgr –help
Usage:
phpextensionmgr [options] [action] [extension]

Options:
–help       Help message
–prefix     Installation prefix for PHP (normally /usr/local or /usr/local/php4)

Actions:
install      Install or update the extension
uninstall    Uninstall the extension
status       Display the installation status of the extension
list         Show available extensions

To install Zend Optimizer, execute the command

root@server [~]# /scripts/phpextensionmgr install Zendopt

To verify whether Zend Optimizer is installed, execute:

root@server [~]# php -v

You can install the other available extensions using the same command, just replace ‘Zendopt’ with the extension name you wish to install.

To remove ‘Zend Optimizer’ from the server, just execute

root@server[~]# /scripts/phpextensionmgr uninstall Zendopt

Or

Edit the php.ini file and comment the line that states

zend_extension=”/path/to/ZendOptimizer.so”

under the ‘[Zend]’ section. In this case, make sure you restart the httpd service for the changes to take affect.