HOWTO Send Mail to GMail by Postfix on Ubuntu Server 10 10

You cannot send any mail to GMail from you mail server, unless you set GMail server as your SMTP server.



Step 0 :



Install the Ubuntu Server 10.10 and select Mail Server when install.



Step 1 :



sudo nano /etc/postfix/transport



Append the following line.



*     smtp:[smtp.gmail.com]:587



Step 2 :



sudo nano /etc/postfix/sasl/sasl_passwd



Append the following line.



[smtp.gmail.com]:587     samiux@gmail.com:password



Step 3 :



sudo nano /etc/postfix/main.cf



Add or make the change of the following lines.



relayhost = [smtp.gmail.com]:587

smtp_sasl_auth_enable = yes

smtp_sasl_password_maps = hash:/etc/postfix/sasl/sasl_passwd

smtp_sasl_security_options = noanonymous

smtp_tls_CAfile = /etc/postfix/cacert.pem

smtp_use_tls = yes

mynetworks = 192.168.0.0/24 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128



Step 4 :



cat /etc/ssl/certs/Thawte_Premium_Server_CA.pem | sudo tee -a /etc/postfix/cacert.pem



Step 5 :



sudo postmap /etc/postfix/transport

sudo postmap /etc/postfix/sasl/sasl_passwd



Step 6 :



sudo /etc/init.d/postfix restart



Thats all! See you.

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HOWTO nVidia CUDA 4 0 RC on Ubuntu 10 10 Server

If you have nVidia display card that have several CUDAs on it, you will interested in this tutorial. This time, I would like to show you how to install CUDA 4.0 RC on Ubuntu 10.10 Server.



You will experience a faster server after the installation of CUDA 4.0.



This HOWTO does not require to install X.



Step 1 :



Add the CUDA 4.0 PPA.

sudo add-apt-repository ppa:aaron-haviland/cuda-4.0



Step 2 :



sudo apt-get update

sudo apt-get upgrade



64-bit :

sudo apt-get install nvidia-cuda-gdb nvidia-cuda-toolkit nvidia-compute-profiler libnpp4 nvidia-cuda-doc nvidia-current-modaliases libcudart4 libcublas4 libcufft4 libcusparse4 libcurand4 nvidia-current nvidia-opencl-dev nvidia-current-dev nvidia-cuda-dev nvidia-kernel-common opencl-headers



32-bit :

sudo apt-get install nvidia-cuda-gdb nvidia-cuda-toolkit nvidia-compute-profiler lib32npp4 nvidia-cuda-doc nvidia-current-modaliases lib32cudart4 lib32cublas4 lib32cufft4 lib32cusparse4 lib32curand4 nvidia-current nvidia-opencl-dev nvidia-current-dev nvidia-cuda-dev nvidia-kernel-common opencl-headers



Step 3 :



sudo nano /etc/init.d/nvidia_cuda



Append the following lines.



============= Copy from here ================

#!/bin/bash



PATH=/sbin:/bin:/usr/bin:$PATH



/sbin/modprobe nvidia



if [ "$?" -eq 0 ]; then



   # Count the number of NVIDIA controllers found.

   N3D=`/usr/bin/lspci | grep -i NVIDIA | grep "3D controller" | wc -l`

   NVGA=`/usr/bin/lspci | grep -i NVIDIA | grep "VGA compatible controller" | wc -l`



   N=`expr $N3D + $NVGA - 1`

   for i in `seq 0 $N`; do

      /bin/mknod -m 666 /dev/nvidia$i c 195 $i;

   done



   /bin/mknod -m 666 /dev/nvidiactl c 195 255



else

   exit 1

fi



=========== Copy to here =================



Step 4 :



sudo chmod +x /etc/init.d/nvidia_cuda

sudo update-rc.d nvidia_cuda defaults



Step 5 :



Reboot your system.



Remarks



I do not have nVidia display cards server in hand at the moment, I am not sure the captioned startup script working properly or not.



Thats all! See you.

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HOWTO Linux Malware Detect on Ubuntu 12 04 LTS 64 bit

What is Linux Malware Detect?



Linux Malware Detect (LMD) is a malware scanner for Linux released under the GNU GPLv2 license, that is designed around the threats faced in shared hosted environments. It uses threat data from network edge intrusion detection systems to extract malware that is actively being used in attacks and generates signatures for detection. In addition, threat data is also derived from user submissions with the LMD checkout feature and from malware community resources. The signatures that LMD uses are MD5 file hashes and HEX pattern matches, they are also easily exported to any number of detection tools such as ClamAV.



The driving force behind LMD is that there is currently limited availability of open source/restriction free tools for Linux systems that focus on malware detection and more important that get it right. Many of the AV products that perform malware detection on Linux have a very poor track record of detecting threats, especially those targeted at shared hosted environments.



The threat landscape in shared hosted environments is unique from that of the standard AV products detection suite in that they are detecting primarily OS level trojans, rootkits and traditional file-infecting viruses but missing the ever increasing variety of malware on the user account level which serves as an attack platform.



Shared Hosting Environments Only?



Although LMD is designed for Red Hat based system on shared hosting environments with Apache, it can run on Debian or Ubuntu server and desktop editions without any problem. Running Hiawatha is no problem too.



Installation



Step 1 :



sudo apt-get install libc6-i386



wget http://www.rfxn.com/downloads/maldetect-current.tar.gz

tar -xvzf maldetect-current.tar.gz

cd maldetect-*

sudo ./install.sh



Step 2 :



sudo maldet -d -u



Step 3 :



sudo nano /usr/local/maldetect/conf.maldet



change the value of the following variables :



email_alert=1

email_addr="samiux@samiux.com"

* change to your email address



quar_hits=1

maxfilesize="10240k"

string_length_scan="1"



clamav_scan=0

* if ClamAV is not installed.



clamav_scan=1

* if ClamAV is installed.



Step 4 :



sudo nano /etc/rc.local



Append one of the following lines in front of "exit 0" :



/usr/local/maldetect/maldet -m /tmp,/run/shm,/var

* if you are running server edition



/usr/local/maldetect/maldet -m /tmp,/run/shm,/home

* if you are running desktop edition



Step 5 :



sudo maldet -m /tmp,/run/shm,/var

* if you are running server edition



sudo maldet -m /tmp,/run/shm,/home

* if you are running desktop edition



Step 6 :



Make sure the LMD is running properly :



sudo ps aux | grep maldet

sudo ps aux | grep inotify



How it works?



The signature will be updated on daily basis. LMD is monitoring the directories that you entered at Step 4 or 5. Once the malware is detected, you will be informed by email if you set it at Step 3. The detected malware will be quarantine and deleted too.



If you are running Apache, you may consider to install mod_security and mod_evasive in order to enhance the security of the web server. If you installed them, you need to set "public_scan=1".



You may also consider to install ClamAV when it is necessary.



Remarks



Please note that any signature based scanner or defense can be bypassed.



Thats all. See you!

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HOWTO Ubuntu 9 10 on Gigabyte TouchNote T1028X

Hardware configuration



Intel Atom N280 1.6GHz CPU

2GB DDR2 677HMz RAM

250GB 2.5" Hard Drive (Changed to Intel X25-M 80GB SSD)

10.1" Touch screen

PC Express card slot

3 x USB 2.0

All-in-one card reader

Carrying bag



This tablet netbook is in good desgin and quality. It is purchased on 2009-DEC-11 at $4,700-HK with USB mouse and screen protector as gifts. However, the screen protector is a little bit larger than the screen. I also added a Hauwei EM770 3.75G HSDPA modem and changed the hard drive to Intel X25-M 80GB SSD. The total cost is increased to $7,260-HK. Although the price is more or less reached the mid-range notebook level, it is worth to buy. By the way, it is a little bit heavy when holding it with one hand using touch screen feature.



Make sure to update your BIOS to "FC" version as it will activate the Wifi by default. The machine comes with "FB" version of BIOS.



The machine almost works perfectly on Ubuntu 9.10 including HSDPA modem but except touch screen feature. We need to do something to make it work.



Installation of Ubuntu 9.10



Make sure to press F6 on the startup menu and choose "expert mode" and followed by "Esc". Otherwise, your mouse will not work after the boot up.



Append the following line at the end of the command displayed on the screen.



elevator=noop i8042.noloop=1



Install Ubuntu 9.10 as usual. After the first boot up your mouse cannot work. Just follow the steps below to make it work again.



Press Ctrl+Alt+F2. At the command prompt, enter your username and password.



sudo nano /boot/grub/grub.cfg



Locate "linux" tag and append the following at the end of the line.



elevator=noop i8042.noloop=1



Save and reboot your system.



** Note : you need to add the line on every kernel updated.



Configure touch screen



sudo apt-get update

sudo apt-get upgrade

sudo apt-get dist-upgrade



sudo apt-get install xserver-xorg-input-evtouch gnome-randr-applet



sudo nano /etc/hal/fdi/policy/evtouch.fdi



Append the following lines.





<?xml version="1.0" encoding="UTF-8" ?>

<deviceinfo version="0.2">

<device>

<match key="info.product" contains="eGalax Inc. USB TouchController">

<merge key="input.x11_driver" type="string">evtouch</merge>

<merge key="input.x11_options.ReportingMode" type="string">Raw</merge>

<merge key="input.x11_options.Emulate3Buttons" type="string">false</merge>

<merge key="input.x11_options.Emulate3Timeout" type="string">1</merge>

<merge key="input.x11_options.SendCoreEvents" type="string">On</merge>

<merge key="input.x11_options.MinX" type="string">0</merge>

<merge key="input.x11_options.MinY" type="string">2</merge>

<merge key="input.x11_options.MaxX" type="string">4096</merge>

<merge key="input.x11_options.MaxY" type="string">4096</merge>

</match>

</device>

</deviceinfo>





Reboot your system.



After booting up, go to "System" - "Administration" - "Calibrate Screen" and follow the instruction on screen to calibrate the screen.



Screen Rotation



You can rotate your screen on demand by Gnome Randr Applet. However, it cannot rotate your screen automatically.



Make Firefox work better



Install "Grab and Drag" add-on.



"Grab and Drag" add-on demo on Youtube.



Thats all. See you!

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HOWTO nVidia CUDA Toolkit 4 0 on Ubuntu 11 04 Desktop

The CUDA Toolkit 4.0 is released on May 2011. If you have nVidia display card that have several CUDAs on it, you will interested in this tutorial. This time, I would like to show you how to install CUDA Toolkit 4.0 on Ubuntu 11.04 Desktop.



You will experience a more faster desktop after the installation of CUDA Toolkit 4.0. Meanwhile, if you installed SMPlayer, you can playback 1080p videos with the help of vdpau.



Step 1 :



Add the CUDA 4.0 PPA.

sudo add-apt-repository ppa:aaron-haviland/cuda-4.0



Thanks for the developer of CUDA 4.0 PPA - Aaron Haviland of his contribution to make CUDA Toolkit to be installed easily.



Step 2 :



sudo apt-get update

sudo apt-get upgrade



64-bit :

sudo apt-get install nvidia-cuda-gdb nvidia-cuda-toolkit nvidia-compute-profiler libnpp4 nvidia-cuda-doc libcudart4 libcublas4 libcufft4 libcusparse4 libcurand4 nvidia-current nvidia-opencl-dev nvidia-current-dev nvidia-cuda-dev opencl-headers



32-bit :

sudo apt-get install nvidia-cuda-gdb nvidia-cuda-toolkit nvidia-compute-profiler lib32npp4 nvidia-cuda-doc lib32cudart4 lib32cublas4 lib32cufft4 lib32cusparse4 lib32curand4 nvidia-current nvidia-opencl-dev nvidia-current-dev nvidia-cuda-dev opencl-headers



Step 2a (Optional) :



If you do not have any nVidia driver installed before or you encounter any problem of booting up your system, you need to do the following command. Otherwise, this step is not required at all.



sudo nvidia-xconfig



**This step may not be required.



Step 3 :



Reboot your system.



Step 4 (Optional) :



To install SMPlayer.



sudo apt-get install smplayer smplayer-translations smplayer-themes



Then set it to use "vdpau" at "Output Driver" at "Preference".



Step 5 (Optional) :



Once installed the CUDA Toolkit and nVidia drivers, you can download the sample codes for testing.



sudo apt-get install freeglut3-dev libxi-dev libXmu-dev



wget http://developer.download.nvidia.com/compute/cuda/4_0/sdk/gpucomputingsdk_4.0.17_linux.run



sudo chmod +x gpucomputingsdk_4.0.17_linux.run

./gpucomputingsdk_4.0.17_linux.run



Accept the default settings.



cd NVIDIA_GPU_computing_SDK/C

make



** Please ignore the warning messages for unsupported gcc version. That is no harm at all.



Run the sample codes.



cd NVIDIA_GPU_computing_SDK/C/bin/linux/release

./deviceQuery

./nbody



Thats all! See you.

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Fedora and Gnome 3 Ubuntu and Unity will openSUSE and KDE benefit

Right now it seems like some of the top Linux distributions such as Fedora and Ubuntu are heading down a slippery slope.

Fedora 15 will be based on Gnome 3, it is still early days for the Gnome 3 project and over time I am confident it will get better but many (including myself) feel its not ready for use.

I believe the simplicity of Gnome 2.x is what made it a success, the main menu bar provided a quick and efficient method of accessing your applications / system settings. The ability to minimize to a panel also provided users with a quick and efficient method of accessing minimized programs and by its very nature visually indicated that a program has been minimized.

Gnome 3 on the other hand doesn’t really have a place to minimize applications to and should you use the gnome tweak tool to enable the minimize button to application windows, applications disappear (not minimize) to the activities tab leaving the user with no apparent visual indicator that an application has been banished (minimised) to the activities tab.

Accessing or viewing applications in Gnome 3 generally requires use of the activities tab where you can either browse through all your applications or search for an application. Unfortunately the Gnome 2.x method of using the main menu (a concept featured in all major operating systems) is still a quicker and more efficient method of accessing your applications. The search function works effectively, although it doesnt help if you dont know what you are searching for.

There is also space in the activities tab to place some of your favorite applications in a dock like fashion which will certainly mitigate some of the inefficiency caused by the method of browsing through or searching for applications, but some will always find it a slight annoyance since you have to invoke the activities tab to view it.

People moved away from the command line and into graphical user interfaces because it made doing things easier and quicker, the current implementation of Gnome 3 compared to Gnome 2.x therefore seems like a step in the wrong direction.

However, visually speaking Gnome 3 looks very modern and stylish.

With Fedora being a project that aims to lead the advancement of FOSS the decision to include bleeding edge software and the latest developments such as Gnome 3 is the right decision and inline with the project goals.

Fedora users will be familiar with the possibility that the latest and greatest can sometimes have a detrimental consequence and for many Gnome 3 is no exception. But the sad reality in this instance is for many Fedora users Gnome 3 is unworkable.

So what will these users do? 

I expect many to hop over to another distro that still features Gnome 2.x and come back at a later date providing Gnome 3 has improved. Alternatively, Fedora does have a few other spins but Fedora at heart has always been a Gnome distribution and the majority of its users Gnome users.

What about Ubuntu?

Taking a look at Ubuntu presents a similar situation. Canonical Ltd have recognized that Gnome 3 is not quite ready for the Ubuntu user base and their solution is Unity. Ubuntu 11.04 features the new Unity desktop from Canonical Ltd which is currently a mish mash of Gnome 2.x and Compiz.

Just like Gnome 3, some users like it and others hate it. Quite clearly Unity is not a finished product and I cannot understand why it was decided to make Unity the default desktop in Ubuntu 11.04.

Some users feel Unity is easy to use and if you rarely ever have to go beyond the dock that stands to follow but just like Gnome 3 it also lacks the application menu as featured in Gnome 2.x. A poor decision.

Instead you can view all applications by using the applications tab or the search function, this is the same as Gnome 3.

The simplicity Gnome 2.x provided Ubuntu users has been lost with Unity, the very simplicity that made Ubuntu easier to use.

Personally I think Unity for Ubuntu is a lost cause. There is nothing wrong with trying out new ideas and I give credit to Canonical Ltd for trying but those who are not good at using computers or those who find slick looking 3D GUIs complicated and hard to navigate will not appreciate Unity.

I feel Canonical Ltd have over looked how the simplicity of Gnome 2.x contributed to making Ubuntu easy to use.

So what now for Ubuntu and Fedora users?

If you are one of those users who likes to have the latest version of a distribution the future may be looking quite grim. It has been confirmed that Ubuntu 11.10 will not feature a classic Gnome 2.x interface and future versions of Fedora will have Gnome 3.

Looking ahead, Unity in Ubuntu 11.10 and Gnome 3 in Fedora 16 may be a completely different experience from what we are seeing right now but nothing is for certain. Therefore due to that uncertainty some users may go about looking for another distribution that doesnt use Gnome 3 or is not Ubuntu with Unity.

The quest for another distribution will inevitably spark interest in some of the other desktop environments available and speaking of desktop environments, is there anything worth mentioning over KDE 4.6.x?

Will openSUSE therefore benefit?

With the recent acquisition of Novell by Attachmate now complete, SUSE has been split away from Novell and will be established as its own corporate entity. A positive step in the right direction for SUSE and the openSUSE project.

Despite my own reasons for putting openSUSE behind me, it has the best implementation of KDE 4.6 (although I maintain the view if you have the time and patience, Gentoo with KDE is better) and a powerful system management application called YaST which makes administering your system easy (or at least in some instances that is the idea).

Since the release of KDE 4.6 things have been looking very good for KDE and given openSUSE is a strong KDE distribution with many KDE developers behind it, if you are looking for a solid and usable desktop environment KDE 4.6.x (in other words openSUSE 11.4) is a great choice.

The openSUSE project could do with more users, so if you are looking to try something different openSUSE is definitely worth considering.

Its funny how things can change in just a few months,  not so long ago I would have been quite happy to recommend Ubuntu or Fedora but with current developments this is no longer the case.

And not so long ago I was voicing my annoyance with openSUSE 11.4 but believe me, its nothing compared to Unity and Gnome 3.

Read More..

Ubuntu 10 04 Ambiance or Radiance

Released yesterday, Ubuntu 10.04 comes with a stylish new look. Brown is no more!

The default theme called Ambiance is a stylish black theme whilst another optional theme available to choose is the new Radiance theme.

Ambiance, Ubuntus new stylish black theme!

Radiance, Ubuntus new stylish white theme!

Click on the pictures for a bigger view.

If you only hated Ubuntu because of its brownish look, what excuse do you have now?

Read More..