This is a great command to simply find what folders are the biggest in a directory. You can replace the /var/cpanel with any folder and it will list everything in there and how big they are in order.

Once you find the big folder then search inside of that to find the biggest folder in there and so on.

Moving the log folder

mv /var/log /backup/
ln -s /backup/log /var/log

Moving the cpanel bandwidth folder

mv /var/cpanel/bandwidth /backup/
ln -s /backup/bandwidth /var/cpanel/bandwidth

Also just removing some of the log files in the log folder can help you for a quick fix.

Clearing Your DNS Cache

Your DNS cache stores the locations (IP addresses) of pages you have recently viewed. If the location of the page changes before the entry in your DNS cache is updated, you will be unable to access the page.

If you are encountering a high number of HTML 404 error codes, you may need to flush your DNS cache. Once you clear your DNS cache, your computer will query nameservers for the new DNS information you require.

For more information about the HTML 404 error code, please visit the HTML 404 wikipedia article.

The methods detailed below allow you to remove old and inaccurate DNS information that may result in 404 errors.

Windows® XP, 2000, or Vista®

Open the Start menu.
Go to Run.
If you do not see the Run command in Vista, search for “run” in the Search bar.
In the Run text box, type: ipconfig /flushdns
Press Enter or Return, and your cache will be flushed.

MacOS®

Go to Applications.
Go to Utilities.
Open the Terminal application.
Type: dscacheutil -flushcache
Press Enter or Return, and your cache will be flushed.

which date

For most servers it is:

/bin/date

This is the same for perl and php

fsck -a

Will automatically fix errors.

uname -a

Nic / Lan driver version

dmesg | grep r8169

Internet controller

lspci -nn | grep Ethernet

Details on etho nic card

sudo ethtool eth0

Module size

lsmod | grep r8169

Module versions

cat /proc/modules | grep r8169

Don’t worry all these commands are safe and just for reporting.

Here is how to get it set up with Cantos 5.3 easily.

I wanted to host for my brother the latest WoW patch, but at a hefty 450 MB, I didn’t want to blow all my bandwidth on it either. I am setting a limit for the download at 2.5 TB of bandwidth, and limiting it to 5mbs at 10 connections a second. My hardware is RHEL 4 running on a P4 with Plesk 8. In the guide to follow, you’ll see a few steps that wouldn’t be needed on a non-plesk system. To setup bandwidth limiting for the host, we need to be able to compile a new apache module against our system, and then install and configure it.

Step 1: The prereqs

First I needed to setup a yum repository for FC4. This can be accomplished by issuing an RPM command:

rpm -ivh http://rpm.livna.org/livna-release-4.rpm

Now that you can access the RPM packages, we need to install http-devel using yum:

yum install httpd-devel

If all went well, we can now extract, compile, and install mod_cband for apache:

cd /tmp
wget http://cband.linux.pl/download/mod-cband-0.9.7.4.tgz
tar xzvf mod-cband-0.9.7.4.tgz
cd mod-cband-0.9.7.4
./configure
make
make install

If all went well, restart apache with the new module (you can check httpd.conf to make sure the module is going to be loaded):

/etc/init.d/httpd restart

Step 2: Configuration

Here’s where the Plesk part gets annoying. We can’t just edit our vhosts file, because plesk writes over it all the time. Instead, we edit a /home/httpd/vhosts/*/subdomains/*/conf/vhost.conf file. Mine looks like this:

CBandScoreboard /var/www/scoreboard
CBandPeriod 4W
CBandDefaultExceededCode 509
CBandLimit 2500G
CBandSpeed 5000 5 10
CBandRemoteSpeed 1600 3 1
<Location /cband-status>
SetHandler cband-status
</Location>
<Location /cband-status-me>
SetHandler cband-status-me
</Location>

What does this mean? (1) Use /var/www/scoreboard to log usage and limits (2) Reset the limit count every 4 weeks (3) Throw a 509 error when the limits are exceeded (4) Allow 2.5TB per period (5) Allow 5mbs with 5 requests a second and 10 connections at a time oeverall (6) Allow 1.6mbs with 3 requests a second and 1 connections at a time per client (7) Allow us to access a page at /cband-status to view the status.

You’ll also need to issue commands to make the scoreboard directory, and to allow apache to own it:

mkdir /var/www/scoreboard
chown apache:apache /var/www/scoreboard

Finally, Plesk requires you to inform it of your work:

/usr/local/psa/admin/sbin/websrvmng -u –vhost-name=yourdomain.com

If you restart Apache now, everything should work!

/etc/init.d/httpd restart

Step 3: An Example

You can take a peek at my status page right now if you’d like. It looks a bit like this:

A quick note, I simply just added:

CBandPeriod 4W
CBandLimit 10000G
CBandSpeed 12000 40 80
CBandRemoteSpeed 6400 12 4

Now this set the limit to about 12 megs (MPS) a second which is a lot, but this customer is paying $250 a month to cover it. Most websites should max at about 5 MPS. I left out the other options because I didn’t need them and it’s less load on the server without them.

-e means execute the following line of code.
-i means edit in-place
-w write warnings
-p loop

Example I had the following style sheet in a section:
<link rel=”stylesheet” type=”text/css” href=”../includes/style.css”>

and I wanted the following instead:
<link rel=”stylesheet” type=”text/css” href=”admin.css”>

As each expression is a regular expression you’ve got to escape the special characters such as forward slash and .
\.\.\/includes\/style\.css

So the final line of code ends up as
perl -pi -w -e ‘s/\.\.\/includes\/style\.css/admin\.css/g;’ *.php

The –bwlimit option limit I/O bandwidth. You need to set bandwidth using KBytes per second. For example, limit I/O bandwidth to 10000KB/s (9.7MB/s), enter:

rsync –delete –numeric-ids –relative –delete-excluded –bwlimit=10000 /path/to/source /path/to/dest/?

10 megs a second is plenty of speed and will keep the server running smoothly when your grabbing allot of files off of it.

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