Allowed memory size of x bytes exhausted (tried to allocate xbytes)

Fatal error: Allowed memory size of x bytes exhausted (tried to allocate xbytes)

The error normally occurs when PHP tries to process a big database records or when importing or exporting. To solve the error, there are two fixes. One is to increase PHP memory limit of the account by using a custom php.ini file. But sometimes it won't work.

If it didn't work, then you can fix the error by increasing the memory of the particular PHP script (displayed in error message) by adding an additional line at the top of the script:

Enable Iptables Modules for a VPS

Below was the error while trying to install CSF in one of the OpenVz containers:

    ----------------------------------error--------------------------------
    [root@abc ~]# perl /etc/csf/csftest.pl
    Testing ip_tables/iptable_filter...OK
    Testing ipt_LOG...FAILED [ 4294967295] - Required for csf to function
    Testing ipt_multiport/xt_multiport...FAILED [FATAL Error: iptables: Unknown error 4294967295] - Required for csf to function
    Testing ipt_REJECT...OK
    Testing ipt_state/xt_state...FAILED [FATAL Error: iptables: Unknown error 4294967295] - Required for csf to function
    Testing ipt_limit/xt_limit...FAILED [FATAL Error: iptables: Unknown error 4294967295] - Required for csf to function
    Testing ipt_recent...FAILED [Error: iptables: Unknown error 4294967295] - Required for PORTFLOOD and PORTKNOCKING features
    Testing xt_connlimit...FAILED [Error: iptables: Unknown error 4294967295] - Required for CONNLIMIT feature
    Testing ipt_owner/xt_owner...FAILED [Error: iptables: Unknown error 4294967295] - Required for SMTP_BLOCK and UID/GID blocking features
    Testing iptable_nat/ipt_REDIRECT...FAILED [Error: iptables v1.3.5: can't initialize iptables table `nat': Table does not exist (do you need to insmod?)] - Required for MESSENGER feature
    Testing iptable_nat/ipt_DNAT...FAILED [Error: iptables v1.3.5: can't initialize iptables table `nat': Table does not exist (do you need to insmod?)] - Required for csf.redirect feature
    ---------------------------------------------------------------



Enable Iptables Modules for a VPS:-

How to Import/Export MySQL Databases with SSH

To export a MySQL database, access your Dedicated Server or VPS via SSH and run:

# mysqldump -u username -p database_name > dumpfile.sql

To import a MySQL Database, run:

# mysql -u username -p database_name < dumpfile.sql

How to Clear cPanel/WHM Brute Force Log from SSH

If you find that you have accidentally been locked out of your WHM/cPanel server by Brute Force Detection, you can log in to your Server or VPS via SSH and run the following command to clear the brute force log:

# echo “delete from brutes; delete from logins;” | mysql cphulkd

How to Check CPU Info with SSH on Linux

To check the CPU allocation and information on your VPS, simply log in to SSH as root, and run the following command:

# cat /proc/cpuinfo

How to Install IonCube loader

IonCube is a PHP module extension that loads encrypted PHP files, and speeds up webpages that are being displayed.

It is often required for a lot of PHP-based applications.

Download ioncube from their site according to your system: http://www.ioncube.com/loaders.php

So for example, for linux x86,

# cd /usr/local/src
# wget http://downloads2.ioncube.com/loader_downloads/ioncube_loaders_lin_x86.tar.gz
# tar -xfz ioncube_loaders_lin_x86.tar.gz
# mv ioncube /usr/local

Use a text editor to open up php.ini in /usr/local/lib/phi.ini and insert:
zend_extension=/usr/local/ioncube/ioncube_loader_lin_5.2.so
according to your php version. Save and restart httpd.
 
# nano -w /usr/local/lib/php.ini
# service httpd restart