There are a lot of people do not know what these variables and how they can be used , this Variables exist in php.ini file , the php.ini file is contains settings PHP on server , and for each variable in the php.ini file have a special role and can be disabled and activated with ON and Off

Disable = Off

Activate = On

So now I will explain to you the benefit of each function and put you a choice in the activation and disable

expose_php

Is a a property from which to see PHP version on the server so disabling means not making available to the hacker to know the version of PHP

allow_url_fopen

When you disable this function no one will be able to contain another link in a specific page , but some scripts like AM4SS – Vbulletin need this function for the arrival of notifications within the Admin Control Panel

register_globals

When you Desable this function become possible to control the content of php files difficult and does not allow the Edited only by the owner
So now we come to the disabled and activation of these properties

Enter in the shell and modify the php.ini file with the following command

nano /usr/local/lib/php.ini

By pressing Ctrl + W will open new box writes what you want to search for inside file

Looking for the variable you want edited for example

allow_url_fopen

You’ll find as follows :

allow_url_fopen = On

Mark value after the mark (=) On for activate Off  for disabled , Apply it with the rest of the properties , After completion of the amendment to click on the keys CTRL + X + Y then Enter button

You will see a new command line in the main interface in shell
Observation : you must restart Apache after any amendment to this file for edited is defined in the php and Apache
To restart apache :

service httpd restart

Or you can restart apache using server Control Panel WHM In a private box to restart services From there you can restart any service you want to.

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How do I tell rsync to use a different port for SSH ?

# rsync -av -e "ssh -p [port_number]" user@ip:/path/to/source/ /path/to/destination/

Example, i will copy data from root@209.141.56.112:/root/backup/ to /home/lifelinux/backup/ with source server has ssh port is 2222. Type the following command

# rsync -av -e "ssh -p 2222" root@209.141.56.112:/root/backup/ /home/lifelinux/backup/

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Load balancing helps provide redundancy to your website. However, one often asked question is how to keep your content synchronized on each server. If you put a new web page on one server, how does it get copied over to the second server? In this article, i’ll explain how to use rsync command to synchronize data between a specific directory on each server.

Install rsync

On Centos Linux type the following command:

yum install rsync

Using rsync command with password authentication

For example, i have two servers using for load balanced and called server1(192.168.1.101) and server2(192.168.1.102). I wanted to keep data in /var/www/html sync between to servers. Type the following command on server1:

rsync -avr --progress --links --rsh='/usr/bin/ssh' 192.168.1.102:/var/www/html /var/www/html

With:
-avr : archive mode (a), verbose (v), recurse into directories (r).
–progress: Show progress.
–links: copy symlinks as symlinks.
–rsh: use to specify the remote shell ssh to use.
192.168.1.102:/var/www/html: IP address of server2 and path to synchronize to server1
/var/www/html: Server1 path

Using rsync command with SSH certificate

Replace above command with following command:

rsync -avr --progress --links --rsh='/usr/bin/ssh -i /path_to_private_key' 192.168.1.102:/var/www/html /var/www/html

A sample shell script

#!/bin/bash
SOURCEPATH='source'
DESTPATH='destination'
SOURCEHOST='ip_address'
PRIVATEKEY='private_key'
LOGFILE='log_file'
SSH='/usr/bin/ssh'
rsync -avr --progress --links --rsh="'$SSH -i $PRIVATEKEY'" $SOURCEHOST:$SOURCEPATH $DESTPATH 2>&1 >> $LOGFILE

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Q. Is there an easy way to recursively copy all files include hidden files in a directory to another directory?

A. Using rsync command is a better solution.

rsync -av --progress /source /destination

With:

-a: Archive Mode

-v: Verbose Mode

–progress: Show progress during transfer.

Another solution, you may also use cp command and pattern matches, type the following command:

cp -R ./[^.]* /destination

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