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Xen VPS modprobe: QM_MODULES: Function not implemented

June 28th, 2008 | No Comments | Posted in System Administration

I got this problem on one of Debian VPS when tried to run iptables command

modprobe: QM_MODULES: Function not implemented
 
modprobe: QM_MODULES: Function not implemented
 
modprobe: Can't locate module ip_tables
iptables v1.3.6: can't initialize iptables table `filter': iptables
who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.

To fix this you’ll need to run these commands:
More »

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Meaning of /dev/null 2>&1 in Crontab’s Cron Job

June 11th, 2008 | No Comments | Posted in System Administration

If you use cron job on Linux, some times you want to ignore the output of the command you executed. This can be done by adding “> /dev/null 2>&1” behind the cron job command.

The command is just work want it should be, but I always curious with what does 2>&1 means. The “> /dev/null” is pretty obvious of what it does without much more explanation, it just redirect all the output to /dev/null which in Linux means we don’t care with the output (or sort of, it’s my own definition). More »

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Xen Debian VPS Problem With nash-hotplug Using 100% CPU Resource

June 3rd, 2008 | 1 Comment | Posted in System Administration

Recently I setup a Debian 4.0 VPS using xen image from jailtime.org, once the VM running I noticed that the load goes 1.0 all the time which make the VM very slow. From top command you’ll see the nash-hotplug process is the cause.

First you can kill it by execute the ‘kill -9 <process id>’ command (without the quotes), where <process id> is the process id of nash-hotplug. Then to automate killing the nash process every time you reboot the VPS run these commands: More »

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PHP Unable to Connect to MS SQL Server Express Edition

June 2nd, 2008 | 2 Comments | Posted in Programming

I’ve been struggling for several hours to find out why PHP 5.2.5 didn’t want to connect to MS SQL Server 2005 Express Edition although extension=php_mssql.dll already enabled and phpinfo() is showing MS SQL already active.

I always got this error messages when trying to connect to MS SQL:

Warning: mssql_connect() [function.mssql-connect]: Unable to connect to server: (local)\SQLEXPRESS in path\mssql.php on line 5

After doing some searching, I got an answer that PHP 5 is using old ntwdblib.dll version. The one that comes with PHP 5.2.5 distribution is version 2000.2.8.0 which seems doesn’t compatible with the new MS SQL Server 2005 Express Edition. I downloaded new dll from http://webzila.com (use the search tool) which is version 2000.80.194.0 and replaced the one on PHP folder with this version.

I use this code to test the connection and its working:

 
echo("Testing MS SQL connection... ");
 
if ($conn = mssql_connect('(local)\SQLEXPRESS', 'user', 'pass'))
{
    echo("Connection succeed");
 
    mssql_select_db('dbname', $conn);
    mssql_close($conn);
}
else
{
    echo("Connection failed");
}

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