Postfix is one of the most widely deployed mail servers. In this tutorial, I will first show you how to configure Postfix for local system accounts and then I will describe how to configure Dovecot for POP and IMAP servers so remote users can retrieve their emails using email clients like Mozilla Thunderbird, Evolution or [...]
In this tutorial, we will see how to get information about audio or video file, convert from one audio or video format to another, capture audio or video from a device, capture screen and extracting audio or video from a multimedia file using ffmpeg.
This video tutorial will show how to install and configure BIND9 DNS server on Red Hat 5, Centos 5 , Fedora or one of their derivatives. Checkout the text version of this tutorial. The tutorial was specifically written for Red Hat, Centos, Fedora and derivatives but it can be used for any Linux distributions.
In my earlier tutorial, I showed you how to do manual backup with rsnapshot. You should have completely followed that tutorial before continuing on with this one. In this how-to I will describe how to automate rsnapshot backups
Sometimes, we need to configure our mail server so that it only sends emails and not receive them which avoids opening port 25 for smtp. In this tutorial, I will show a very simple way to set up Postfix so it send emails out to external domains only and not receive any emails from outside.
In this tutorial I will show you how to set up simple but complete DNS system on Red Hat or Centos. We, humans, are good at names while computers require IP numbers to communicate. To help us with that DNS comes to our rescue. BIND is open-source software that implements the Domain Name System (DNS) protocols for the Internet. The name BIND stands for “Berkeley Internet Name Domain”, because the software originated at the University of California at Berkeley.
Ping which stands for Packet INetrnet Gropper, is a great utility when it comes to troubleshooting network issues. It is part of iputils package. It sends ICMP “echo request” packets to the target system and listen for “echo response” replies. Ping records the round-trip time and records any packet loss. It prints a summary at [...]
Grub stands for GRand Unified Bootloader. When a PC starts, processor executes code stored in flash memory on the motherboard commonly known as BIOS (Basic Input Output System). Bios performs power-on self test (POST) which checks hardware. It then finds the device from which to boot the PC and loads its first sector into memory.
If you are desperate because you have forgotten root password, don’t be. This tutorial will show you how to reset root.
Some of the time, we are in need to do some quick calculations while on console or terminal. Here what bc, a command line calculator, comes in handy.