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Author Description

Rahul
Rahul
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I, Rahul Kumar am the founder and chief editor of TecAdmin.net. I am a Red Hat Certified Engineer (RHCE) and working as an IT professional since 2009..

08 March 2013

How to Install Postfix on CentOS/RHEL 7/6/5

Written by Rahul
Rahul
Postfix is fast and popular SMTP server widely used. The main job of postfix is to relay mail locally or to the intended destination outside the network. Some of the most popular SMTP servers are Sendmail, Postfix, and Qmail. By default, Sendmail comes pre-installed with CentOS/RHEL 5. We will need to remove it and...
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Mail Servers, Postfix 10 Comments
07 March 2013

What is Soft Links and Hard Links in Linux File System

Written by Rahul
Rahul
Links or Symbolic links are a special type of file that contains a reference to another file or directory. In simple world a single file or directory available at 2 or more locations. There are two types of symbolic links can be create 1- Soft Link and 2- Hard Link. Difference Between Soft Links...
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Filesystem Leave a Comment
05 March 2013

How to Secure Specific URL in Apache

Written by Rahul
Rahul
Some times we required to secure a single url or few specific urls in our site, and all other site url keep remain with public access. This is very easy to manage with are using directory and file structure in sites. But some of framework like cakephp work on routing structure which is different...
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Apache, Security 2 Comments
02 March 2013

How to Shrink SQL Server Transaction Log Files using DBCC SHRINKFILE

Written by Rahul
Rahul
Sometimes SQL Server logs files acquire a large space on disk. In that case, we need to reduce the size of the log file to claim some space. But truncating or reducing database log file in SQL Server 2008 can be quite difficult. It also has its own issues. This article contains a set...
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SQL Server 1 Comment
02 March 2013

Network Configuration in CentOS & Red Hat

Written by Rahul
Rahul
Linux provides a number of tools for network configuration. Most important network settings for you Linux machine to access over network are IP configuration Device activation DNS configuration Default gateway 1. Default Network Configuration Files: Default linux interfaces configuration file exists in /etc/sysconfig/network-scripts/ named ifcfg-ethX ( ‘X’ is replace with number 0,1 or 2...
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Networking 1 Comment
02 March 2013

How to Create RPM for Your Own Script in CentOS/RedHat

Written by Rahul
Rahul
RPM (RedHat Package Manager) is a package management system for RHEL based systems. You may have seen that all the packages in Redhat based systems have extension .rpm. This tutorial will help you to how to create RPM for your own script I had created a script to take database backup, Today I have...
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Linux Tutorials 4 Comments
01 March 2013

How to Enable HAProxy Stats

Written by Rahul
Rahul
HAProxy Stats provides a lot of information about data transfer, total connection, server state etc. After installing HAProxy if you want to view HAProxy stats in your web browser, You can easily configure it by making few changes in your HAProxy configuration using following steps. Step 1: Enable Stats in HAProxy To enable stats...
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Linux Tutorials 3 Comments
01 March 2013

Adding line in middle of file using command in linux

Written by Rahul
Rahul
Hi Guys, If you want to add a line in file at specific line number through script. Below examples will help you to do it. For example you have a file named file1.txt, file content are as below. [email protected]:~ # cat file1.txt tecadmin 1 tecadmin 2 tecadmin 4 Now you required to add text...
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Uncategorized 1 Comment
25 February 2013

Being a System Admin your responsibilities

Written by Rahul
Rahul
Being a system administration you have all responsibilies to maintain your systems. System admin is a person having good knowledge about operating systems and applications, as well as hardware and software troubleshooting. Many of reponsibilies vary from organization to organization. Basic responsibilities of system administrator’s typically include: 1. User account management. Creating new users...
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Uncategorized 1 Comment
24 February 2013

How to Keep Systems Up to Date – CentOS / RHEL / Fedora

Written by Rahul
Rahul
Being a system administrator, we always need to keep our systems up to date with latest packages. Its difficult to go to server daily and check for available packages. For the same we can use yum-updatesd service to get email notifications to our mailbox or we can also configure this service to update any...
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CentOS, Fedora, Linux Tutorials, RHEL 2 Comments
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