Written by Below you will find the installation of virtualbox on ubuntu.
http://www.firatatagun.com/virtualbox/
installing VirtualBox on Ubuntu is pretty straight forward. Moreover, you can read more from:
Posts in category Linux
Ubuntu 9.10 comes with many bugs
As part of a study, I installed 20 Ubuntu instances connected to 4 switch, 1 bridge (learning bridge), and a route to make students learn and setup how routing, networking works.
On top of Ubuntu instances, i installed xen virtualization which turns out to be a nightmare. Bugs were all over the place.
Here is one of them:
http://www.howtoforge.com/forums/showthread.php?t=28425
Xen didnt work out for me, then while installing virtual box by sun microsystems, there goes another error, bug. This is just frustrating.
Yet some other application error such as login screen, logging as root, firefox bugs, etc. Some of them were resolved after a period of time.
I was never a fan of Ubuntu and Linux desktops. I prefer using Linux as a server and I like CentOS and RedHat.
A Security note on Cloud Computing
Here goes a hacker and cloud computing :
Hacker sparks an cloud instance and installs bunches of software and programs, such as email servers, dns servers, builds a system, then start spamming and attacking users. After an amount of time, hacker kills the instance, leaving almost no fingerprint behind.
I imagine Amazon and Microsoft would be keeping record of instances, IP addresses and logs but it s also difficult to do this.
Therefore, Cloud Computing need strong security policies and implementations.
Distributed Systems Principles and Paradigms
This is a great book about distributed systems.
Recommend it to everyone who is into Scalability and Distributed Systems.
Centos X window installation- GNOME, KDE
The easiest way to install X (and a GUI system) is to use the yum groupinstall feature.
First you can see all the yum groups available with the command:
yum grouplist
You can install X and Gnome or KDE like this:
yum groupinstall “X Window System” “GNOME Desktop Environment”
or
yum groupinstall “X Window System” “KDE (K Desktop Environment)”
You may also want to add some other groups from the list like “Graphical Internet” or “Office/Productivity”
TCPDump installation on Centos Linux
Step by step TCPDump installation on Centos Linux.
# wget http://www.tcpdump.org/release/tcpdump-4.0.0.tar.gz
# tar -xzvf tcpdump-4.0.0.tar.gz
# cd tcpdump-4.0.0
# ./configure
# make
# make install
Installing Snort on Centos Linux
Step by step snort installation on Centos Linux.
# wget http://dl.snort.org/snort-beta/snort-2.8.6-beta.tar.gz
# tar -xzvf snort-2.8.6-beta.tar.gz
# yum install flex
# ./configure
# yum install byacc bison
# make
# make install
# make clean
# wget http://sourceforge.net/projects/pcre/files/pcre/8.01/pcre-8.01.zip/download
# unzip pcre-8.01.zip
#unzip pcre-8.01.zip
# cd pcre-8.01
# ./configure
# make
# make install
# wget http://www.tcpdump.org/release/libpcap-1.0.0.tar.gz
# tar -xzvf libpcap-1.0.0.tar.gz
# cd libpcap-1.0.0
#./configure
# make
# make install
# cd snort-2.8.6
# ./configure
# make
# make install
# make clean
There you go you have the snort installed. You can configure snort with MySQL or other databases.
Centos – C Compiler Installation
Here is how you install C compiler on Centos :
yum install gcc gcc-c++ autoconf automake
Java- Installation and Configuration on Centos Linux
Download the JDK from sun website to your Centos Linux system via wget. The file you ll likely to get will be a bin file.
# chmod 777 jdk.bin
# ./jdk.bin
This will install Java to your system into /usr/java/jdk1.6.0_18 folder
Now you need to set up Java Path so that you system will know where Java is. To do that you need set JAVA_HOME and JAVA Path, otherwise your applications wont find java. You need to add this to .bash_profile file in your home folder.
# export JAVA_HOME=/usr/java/jdk1.6.0_18
# export PATH=$JAVA_HOME/bin:$PATH
Then you need to exit from your shell and re-login to your system, Java will be there for you.
# java -version
will show you the version you are using.
Adding text to the beginning of a file with sed
sed -i '1i TEXT' YOUR_FILE This was quite handy.
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