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How do I scan my Linux system for rootkits, worms, trojans, etc.?

Either with chkrootkit or with rkhunter.


Either install the package that comes with your distribution (on Debian you would run

apt-get install chkrootkit

), or download the sources from and install manually:

wget --passive-ftp
tar xvfz chkrootkit.tar.gz
cd chkrootkit-<version>/
make sense

Afterwards, you can move the chkrootkit directory somewhere else, e.g. /usr/local/chkrootkit:

How can I get a list of quotas assigned to my users and groups and of the space used by them?

repquota -avug

shows a list for both users and groups.

repquota -au

shows a list for users,

repquota -ag

a list for groups.

How can I set a limit as to how much space is available for a web site I put on my server? Like it is limited to 50 MB of space.

First, you have to enable quota on your system. Have a look at the quota section of the appropriate "Perfect Setup" tutorial for your distribution on HowtoForge.

After you've enabled quota on your system:

To set quotas for a user or group, use the setquota command (see

man setquota

for more information), e.g.:

setquota -g $group $blocks $blocks 0 0 -a
setquota -u $username $blocks $blocks 0 0 -a

Replace $group, $username and $blocks. Note: $blocks is the quota size in MB * 1024! To deactivate quotas for a user or group, run these commands and set $blocks to 0.

Quota does not work under SuSE 8.2!

On a standard SuSE 8.2 installation the quota module is not loaded into the kernel which is why

quotaon -avug

gives back an error.

Load the quota module manually with

insmod quota_v1


insmod quota_v2

To have those modules loaded on every bootup of the system please insert

modprobe quota_v1


modprobe quota_v2

in /etc/init.d/boot.local.

Configuring Tomcat5 and Apache2 with Virtual Hosts using mod_jk

Configuring Tomcat5 and Apache2 with Virtual Hosts using mod_jk

This tutorial explains how I was able to setup a web server in order to support Java Server Pages (JSP) and Servlets using virtually hosted websites. The ultimate goal is to provide instructions on how to incorporate JSP/Servlet support on the ISPConfig web hosting software. I felt it was necessary to provide this first segment separately for those that do not wish to use the ISPConfig web hosting control panel.

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