Tuesday 25 June 2013

How do You Install XvidCap on uBuntu 12.04 Distro

Xvidcap is a small tool to capture things going on on an X-Windows display to either individual frames or an MPEG video. This software is not present in the Ubuntu 12.04 repository by default. You can get a copy of the distributed binary in the form of a .deb package at the following link.
https://launchpad.net/ubuntu/precise/amd64/xvidcap/

Once you download this package, go ahead and install the package with the following command. The amd64 package given as example is for 64 bit machine.
$ sudo dpkg -i xvidcap_1.1.7-0.2ubuntu12_amd64
In case if the above command fails giving out errors, please note that Xvidcap depends on libavdevice-extra-53 package. So go ahead and install this package first with the following command.



$ sudo  apt-get install libavdevice-extra-53
By default, the Ubuntu 12.04 comes with libavcodec53 package. This conflicts with the  libavdevice-extra-53. In such a case, feel free to go ahead and replace the libavcodec53 package with libavdevice-extra-53. This satisfies the dependency requirement for Xvidcap.

Once done with setting dependencies, you can then install the Xvidcap package.

This is another posting showing "how to do computing" for everyday computer usages... For a general public 

Friday 21 June 2013

Friday 7 June 2013

POSSIBLE WordPress Under Attack again !!!

ALERT - ALERT - WordPress Based website under attack Again !!!



Potential WordPress problem (Brute Force attack against WordPress websites)
We have monitored on-going brute-force attack against WordPress websites, in order to keep your WordPress website secure, we recommend you do the following:

1. Please change your password for WordPress admin area.

2. Go to your cPanel > File Manager and find your wp-login.php file.



Temporary rename wp-login.php file (for example into wp-login1.php).

You need to change a line in your wp-login.php to reflect the change to the file name. Its line 671 where the form action refers to wp-login.php

-------------------------Update---------------------------

wp-login.php is temporary disabled because of huge brute force attack. Please rename wp-login.php to something else.

Tuesday 21 May 2013

How to add Swap Memory into uBuntu ..



Linux RAM is composed of chunks of memory called pages. To free up pages of RAM, a “linux swap” can occur and a page of memory is copied from the RAM to preconfigured space on the hard disk. Linux swaps allow a system to harness more memory than was originally physically available. 

However, swapping does have disadvantages. Because hard disks have a much slower memory than RAM, virtual private server performance may slow down considerably. Additionally, swap thrashing can begin to take place if the system gets swamped from too many files being swapped in and out.

Check for Swap Space


Before we proceed to set up a swap file, we need to check if any swap files have been enabled on the VPS by looking at the summary of swap usage.
swapon -s

An empty list will confirm that you have no swap files enabled:
Filename    Type  Size Used Priority

Check the File System


After we know that we do not have a swap file enabled on the virtual server, we can check how much space we have on the server with the df command. The swap file will take 512MB— since we are only using up about 8% of the /dev/sda, we can proceed.
df
Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/sda        20907056 1437188  18421292   8% /
udev              121588       4    121584   1% /dev
tmpfs              49752     208     49544   1% /run
none                5120       0      5120   0% /run/lock
none              124372       0    124372   0% /run/shm

Create and Enable the Swap File


Now it’s time to create the swap file itself using the dd command :
sudo dd if=/dev/zero of=/swapfile bs=1024 count=512k

“of=/swapfile” designates the file’s name. In this case the name is swapfile. 

Subsequently we are going to prepare the swap file by creating a linux swap area:
sudo mkswap /swapfile

The results display:
Setting up swapspace version 1, size = 262140 KiB
no label, UUID=103c4545-5fc5-47f3-a8b3-dfbdb64fd7eb

Finish up by activating the swap file:
sudo swapon /swapfile

You will then be able to see the new swap file when you view the swap summary.
swapon -s
Filename    Type  Size Used Priority
/swapfile                               file  262140 0 -1

This file will last on the virtual private server until the machine reboots. You can ensure that the swap is permanent by adding it to the fstab file.

Open up the file:
sudo nano /etc/fstab

Paste in the following line:
 /swapfile       none    swap    sw      0       0 


To prevent the file from being world-readable, you should set up the correct permissions on the swap file:
sudo chown root:root /swapfile 
sudo chmod 0600 /swapfile

How to check for open ports on Linux

Checking for open ports is among the first steps to secure your device. Listening services may be the entrance for attackers who may exploit...