What is Crontab ?
One can enter the list of commands that he wishes to execute at a particular time in future, or they can be scheduled to execute on a daily basis. Crontab is a general text file which holds this list. The commands entered in crontab and the times to execute them is handled by cron daemon. It runs in background. Crontab’s man page explains about itself pretty well. Later we have lined up a crontab example for better understanding.

Proxy is one of the major component of adding security to the network. It also acts as a Gateway that receives the request from the clients and then validates it, when it is fine it forwards it to the destination server.

Squid is one of the most popular Open Source Proxy server and a Web Cache Daemon.

It has the wide variety of features from:

1. Speeding up a web server by caching repeated requests.

2. Caching Web, DNS, and other lookups.

3. Controlling bandwidth, Access controlling, etc.

This article explains how to setup Squid Proxy server in your RHEL 5 / CentOS 5 in a easy step-by-step procedure.

Every User or group in a Linux or (Unix like) Operating system is associated with a unique identity called UserID (UID) for a user and GroupID(GID) for a group.
To know the uid, gid of your account simply type the ‘id’ command in your terminal.
To know the id of any user account, simply type ‘id username’. Replace username with corresponding username.

Configuring VSFTPD in CentOS‭ ‬6.0

vsftpd stands for‭ ‬Very‭ ‬Secure‭ ‬File‭ ‬Transfer‭ ‬Protocol‭ ‬Daemon and it is an popular and well known FTP server for Unix-like‭ (‬Linux‭) ‬Operating system.

It is Licensed under GNU General Public License.

In this tutorial we cover how to configure‭ ‘‬vsftpd‭’ FTP server ‬on CentOS‭ ‬6.0.

Assumptions:

We assume that you are using CentOS‭ ‬6‭ (‬Linux operating system based on RedHat Distribution‭)‬.
And using‭ ‬vsftpd‭ ‬version‭ ‬2.2.2
Your system is connected to Internet via any means.

In this guide I will show you how to install standard LAMP stack on CentOS 6 server. I don’t think there is a huge difference between this setup or the one you probably did in the past on CentOS 5 or Fedora servers (to those of you who actually use Fedora servers).
I still think this tutorial can be helpful for some and that is the reason I’m still publishing this. This is a very easy tutorial with a step by step easy approach. So lets begin with the setup:

First of all you must have CentOS 6 installed and configured, by configured I mean it should be connected to the network and in working condition. No special packaged or configuration needed, you just have to be make sure yum is working and you can install packages from the repositories.