tutorial 9ku

tutorial - Repair Corrupt RPM Database

Strange things sometimes happen, one of them is a corrupt rpm database. This means that the computer tells you something is installed and it really is not.
Here is how to solve this problem.

First backup and then delete by doing the following command:
$ su

# cp /var/lib/rpm/__db.001 /home/nikesh
# rm /var/lib/rpm/__db.001
# cp /var/lib/rpm/__db.002 /home/nikesh
# rm /var/lib/rpm/ __db.002
# rpm –rebuilddb

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source:http://linuxpoison.blogspot.com/2007/10/13578175803779.html

tutorial - Scan vulnerability by using Nessus

Nessus is an incredible commercial-grade vulnerability scanner also freely available under the Gnu Public License (GPL). Nessus can use Nmap to further probe networks for holes. Nessus can selectively scan for over 675 (and growing) known security problems. The resulting reports are organized by host, categorized by severity, and can be exported in a variety of formats, to include a very slick crosslinked HTML including pie charts. Links to fixes for known security problems are included.

Installation

Get the required files from : http://rpm.pbone.net/

# rpm -ihv nessus-core-2.2.3-3.i586.rpm
# rpm -ihv nessus-libraries-2.2.3-3.i586.rpm

Initial Configuration

Create a certificate
```
# nessus-mkcert
```
If you do not know how to answer, just press enter.
Create a user
```
# nessus-adduser
```

Change the runlevel, and start

# checkconfig nessusd on
# /etc/init.d/nessusd start

Update plugins

To use up-to-date plugins, you need to register at http://www.nessus.org/register/
After registering your e-mail, you will receive a message with an id as XXXX-XXXX-XXXX-XXXX-XXXX. You can simple enter like,
```
# nessus-fetch --register XXXX-XXXX-XXXX-XXXX-XXXX
# nessus-update-plugins -v
```

Update automatically by crontab

# crontab -u root -e

Add following line.

45 7 * * * /usr/sbin/nessus-update-plugins

Scanning

Start nessus
```
# nessus &
```
Login to nessus. Type login name and password.
Go to "Plugins" tab and select plugins to perform scanning. For example, press "Enable all" button.
Go to "Target" tab and enter targets. Type either a host name, a host IP address, or network as "192.168.0.0/24"
Press "Start the scan" when you are ready. Wait a while
You will see a report after a couple of moment. So take consideration of the result!

source:http://linuxpoison.blogspot.com/2007/10/135781758010226.html

tutorial - Virtual Hosting using Apache

If you want to maintain multiple domains/hostnames on your machine you can setup VirtualHost containers for them.
Please see the documentation at URL:http://www.apache.org/docs/vhosts/ for further details before you try to setup virtual hosts.

Sample

	FQDN	Document Root
Host Name	www.hell.com (192.168.0.1)	/var/www/html/
Virtual Host Name	server.hell.com (192.168.0.1)	/var/www/server/

BIND Setup

Add an Alias Name into BIND DB file

www             IN      A       192.168.0.1
server          IN      CNAME   www

Apache Setup

httpd.conf

...
NameVirtualHost 192.168.0.1:80  
  DocumentRoot /var/www/html/     ServerName _default_   
  DocumentRoot /var/www/server/     ServerName server.hell.com  ...

source:http://linuxpoison.blogspot.com/2007/10/13578175801544.html