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Archive for the ‘Linux Server’ Category

Jan 10
2013

How to remove ^M characters at the end of lines in Vi from files in Linux?

Last updated: February 6th, 2013

Files created in windows when moved to linux will have ^M character at the end of lines when you open the files in Vi editor.

To remove the strange characters open the file in Vi editor and type

:%s/.$// 

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Dec 06
2012

How to determine the file system type in Linux?

Last updated: February 6th, 2013

Linux supports many file system types like Ext2, Ext3, Ext4, NFS, FAT16, FAT32, NTFS etc. To find out what type of file systems are mounted in your system, issue the command

$ df -T

Output from the command

Filesystem    Type   1K-blocks      Used Available Use% Mounted on
/dev/sda1     ext4    94088076   9090252  80218356  11% /
udev      devtmpfs     1023536         4   1023532   1% /dev
Nov 12
2012

How to install and setup Fail2ban on CentOS?

Last updated: November 12th, 2012

Fail2ban is a software used to ban IP’s which shows strange behavior. It can be configured to reject IP’s for a certain amount of time.

To install Fail2ban we need to download the application from the source. Login as the root user and go to /opt

$ cd /opt

$ wget http://downloads.sourceforge.net/project/fail2ban/fail2ban-stable/fail2ban-0.8.4/fail2ban-0.8.4.tar.bz2?use_mirror=transact

Next unzip the downloaded file

$ tar -xf fail2ban-0.8.4.tar.bz2

$ cd fail2ban-0.8.4
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Oct 02
2012

How to setup Rails on WAMP server using HTTP Proxy module?

Last updated: October 3rd, 2012

To setup Rails on windows after Ruby and Rails setup,

i) Edit hosts file in windows environment and set the server name in the hosts file to

127.0.0.1 myrails

In this example, i have used “myrails” as the server name for the project.

ii) Edit httpd configuration setting on WAMP to make sure proxy and proxy_http module is turned on (check if it those lines are not commented out)

LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_http_module modules/mod_proxy_http.so

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Oct 01
2012

How to install Ruby, Rails and MySQL on Ubuntu Server?

Last updated: October 1st, 2012

For this tutorial we will be using Ruby 1.9.3 and Rails 3.2.1

First thing update
$ sudo apt-get update

Next, we are going to install git, RVM which is essential for the build

$sudo apt-get install build-essential git-core curl

RVM stands for Ruby Version Manager that is used for installing and managing multiple versions of Ruby at one point of time.
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Sep 25
2012

How to check Python version number in Linux/Unix environment?

Last updated: September 25th, 2012

To check the Python version number in Linux, simply type


$ python -V

You will get an output

Python 2.4.3
Aug 15
2012

How to configure Zend Framework on an Apache server in a PLESK environment?

Last updated: August 15th, 2012

First, download the Zend framework and unzip the file contents to a location. At the time of the writing ZendFramework-1.11.12 was in use and we have used that version in this example. Key content of the download is the /library folder which has Zend libraries in it.

Then, go to the “conf” folder that was created when the site was created.

Inside the conf folder, create a new file and name it vhost.conf

Add the below contents to vhost.conf and save it. (more…)

Jun 15
2012

How to Send Emails from your local WAMP XAMPP server in windows?

Last updated: June 23rd, 2012

… a question that raises in the mind of programmers developing applications in their local development environments.

This can be achieved by making the following modifications.

Step (i) Install the WAMP / XAMPP server in your windows machine. After this install you will be able to access sites created on the localhost with URL http://localhost

Step (ii) Download and extract the send mail application for Windows from http://glob.com.au/sendmail/. Remember the path where you have extracted sendmail. For e.g. c:\wamp\sendmail

Step (iii) Edit sendmail.ini within c:\wamp\sendmail. This ini file has enough documentation explaining how the configuration changes should happen on the file.
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Jun 05
2010

Beginner: Why there are many Linux Distributions?

Last updated: July 31st, 2010

There are different variants of Linux in the market like RedHat, Debian, CentOS, Ubuntu, Mandrake, Suse and a Linux beginner often ponder why they call Linux distributions by various names. The kernel or the heart of all the distributions is Linux and in bringing it to different market usage different community or vendors have adopted the kernel to serve that purpose.
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May 16
2010

Asterisk for Beginner: IAX Server configuration settings

Last updated: May 17th, 2010

In the first article on Asterisk, we have seen the Asterisk installation steps and on the environment setup. In this article, we have give the configuration settings for two files iax.conf and extensions.conf which will be used to direct/receive calls from/to iax2 soft clients
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