Amit's Blog

At times, there are issues with the default gateway when having multiple network cards with the same network address. In order to force a network card to be the default gateway you can edit the /etc/sysconfig/network file . set GATEWAYDEV=eth0 or eth1 ……….

Exporting and Importing Virtual Machines in Xen Center Exporting A Virtual Machine : xe vm-export -h hostname -u username -pw password vm=vmname filename=/destination.xva Importing A Virtual Machine : Importing a virtual machine is a little bit trickier than exporting because you have to specify which storage to use in

yum install httpd mysql php php-mysql wget Set up SQL mysql_install_db –user=mysql mysql_secure_installation service mysql start mysql -p You should now be staring at an SQL prompt. The following should be all of the necessary SQL commands for the entire HOWTO. mysql> CREATE DATABASE

mount -n -o remount,rw /

1. Download the latest cygwin and Run setup. 2. Make the selections as per the requirement. 3.Setup a new system variable in the environmental variable : Name :CYGWIN Value: ntsec tty 4. Add cygwin path : ;c:\cygwin\bin to environment path variable. 5. Run the following commands on the cygwin

OperatorExplanation${* variable* #* pattern* }Delete the shortest part of * pattern* that matches the beginning of * variable* ‘s value. Return the rest.${* variable* ##* pattern* }Delete the longest part of * pattern* that matches the beginning of * variable* ‘s value. Return the rest.${* variable* %* pattern* } Delete the shortest part of * pattern* that matches the

Go to your roundcubemail directory. cd plugins/password cp config.inc.php.dist config.inc.php vi config.inc.php > $rcmail_config[‘password_driver’] = ‘sql’; $rcmail_config[‘password_db_dsn’] = ‘mysql://dbuser:dbpass@localhost/vpopmail’; $emailuser=$SESSION[‘username’]; $domain=split(“@”,$emailuser); $dom_table=str_replace(“.”,””,$domain[1]); $rcmail_config[

grant all privileges on dbname.* to dbuser@localhost identified by ‘dbpass’;

> xe sr-create content-type=user host-uuid=1f37e26a-7522-494e-a029-3e3d1d05eaa9 name-label=”LVHD SR” shared=false type=lvm device-config:device=/dev/sdb get the host-uuid with the command : > xe host-list

OIFS=$IFS IFS=”/” DIR=($DIR) IFS=$OIFS echo “This is 0:${DIR[0]}” echo “1:${DIR[1]}” echo “2:${DIR[2]}” echo “3:${DIR[3]}” echo “4:${DIR[4]}”

if [ -z $string ]; then echo “String is Null”

for a in *.wav; do rasterisk -x "file convert /var/lib/asterisk/sounds/custom/$a /var/lib/asterisk/sounds/custom/echo $a|sed "s/.wav/.g729/""; done; If you get error unable to open input file, that means the input file is not in correct wav

It is nice to customize the telephony system to meet your needs. If you are willing to learn more.. here I am writing this small tutorial to describe how to create a php agi to customize the asterisk telephony engine as you like. This little agi connects to database retrieves

*    *   *  *   *  command to be executed -     -    -   -  - |     |     |   |    | |     |     |   |    +----- day of week(0 - 6) (Sunday=0) |     |     |   +------- month (1 - 12) |     |     +--------- day of month (1 - 31) |     +----------- hour (0 - 23) +------------- min (0 - 59) Disable Mail Alert by Cron: 0 1 5 10 * /path/

You can share a bash screen using a utility call screen. yum install screen 1. Connect to a shell and type  issue command : screen 2. Hit Ctrl + a and then type < :multiuser on> 3. Other user type screen -x and connect to the session. 4. Press Ctrl + a

Enable Selected Commands Only (You have to set PermitRootLogin forced-commands-only  in order for this to work ) PermitRootLoginyes,no,without-password,forced-commands-only without-password : allow root login without password ( Using Keys ) forced-commands-only ( Allow only forced commands  with public key authentication and only if the command option has been specified which can be useful

Create .htaccess file with following AuthUserFile /home/username/.htpasswd<br></br> AuthGroupFile /dev/null<br></br> AuthName “Private Area”<br></br> AuthType Basic<br></br> require valid-user``` **create password file :** `httpasswd -bc /path/to/

How to forbid visitors to read files from a directory? Forbidding all files: deny from all Allow access from a certain IP address: order allow deny<br></br> deny from all<br></br> allow from <your_IP>``` In this case,

Change AllowOverride None to AllowOverride All from httpd.conf And then create a file named .htaccess in the folder you want to deny access and put the folowing : order deny,allow deny from all allow from

Find Directories: > find / -name -type d find / -iname -type d (Ignore Case) Find Empty Directories: > find / -type d -empty Find and count the result : > find / -type d -empty | wc -l Find and delete : > find / -type d -empty -exec rmdir {} ; Find and count Not matching criteria (non

Load balancing in Apache is pretty much simple. You need to have a load balancer, and more than one web server. Required module : mod_proxy_balancer This module is an Apache module available starting Apache 2.1. It enables an Apache to act as a load balancer. It can also

> Options -Indexes (disables directory listing) DirectoryIndex myfile.html (displays myfile.html) IndexIgnore *.gif *.jpg (Ignores files)

> $max)) { return FALSE; } else { return TRUE; } } ?> 5) && ($length <> 9)) { return FALSE; } return isDigits($code); case 'CA': if ($length <> 6) { return FALSE; } return preg_match ("/([A-z][0-9]){3}/", $code); } } ?>

> $result= mysql_query(“sql query”); if(mysql_num_rows($result)> 0) { $num_fields=mysql_num_fields($result); $headers = array(“Col1 Name”,”Col2 Name”,”Col3 Name”); $fp = fopen(‘php://output’, ‘w’); if ($fp && $result) { header(‘Content-Type: text/csv’); header(‘Content-Disposition: attachment; filename=”export.csv”‘); header(‘Pragma: no-cache’