Red Hat Linux Reference Guide

Linux Introduction

What is Linux Linux Architecture Filesystem & Directory Structure

VI-EDITOR

Operation Modes VI-Editor Commands

Process Management

What is Linux Process? Linux Process Management

Linux Installation

Linux Installation - Physical Servers

Disk Partitions & File System Management

Disk Partitions File Systems

Logical Volume Management - LVM

What is LVM? LVM Commands & Scenarios

User & Group Administration

What is User & Group? Managing Users and Groups

Package Management

Package Management using RPM Package Management using YUM

Network File System - NFS

What is NFS? NFS Server & Client Configuration

Domain Naming System - DNS

What is DNS? DNS Architecture Configure DNS Server Configure DNS Client DNS Summary

Apache HTTP Web Server

What is HTTP Web Server? HTTP Web Server Architecture Configure Apache HTTP Web Server

KickStart Installations

What is KickStart? Configure KickStart Server

FTP server

What is FTP Server? FTP Architecture Configure FTP Server Configure FTP Client FTP Summary

BOOT PROCESS

What is Boot Process? Boot Process Stages

Dynamic Host Configuration Protocol - DHCP

What is DHCP? DHCP Architecture Configure DHCP Server

Job Scheduling

Cron Jobs Management Cron Job Summary

File Links

Soft Link vs Hard Link

Swap Management

What is Swap?

Log Management

Log Rotate rsyslog

Performance Management

How to Monitor Performance? Performance Tools

Linux Troubleshooting

SingleUserMode vs RescueMode vs EmergencyMode Configure Kdump

Linux Summary

Linux Configuration Files Linux Interview Questions

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How to Monitor Performance?

What is DNS?

DNS is the system service that is used to resolve an IP address to a hostname or vice versa.Linux system that is configured to resolve hostname to IP address globally is called DNS server.

Type of DNS servers:

  • A master DNS server for your domain(s), which stores authoritative records for your domain.
  • A slave DNS server, which relies on a master DNS server for data.
  • A caching-only DNS server, which stores recent requests like a proxy server. It otherwise refers to other DNS servers.
  • A forwarding-only DNS server, which refers all requests to other DNS servers.

Private DNS vs. Public DNS:

Private DNS

Private DNS server is accessable within the private network for clients access. DNS client and DNS server both are configured within the same private network for local domain resolutions.Private DNS servers are used to resolve private domain names/IPs

Public DNS

Public DNS server is accessable within the public internet for client access. DNS client and DNS servers are connected through internet. Public DNS servers are used to resolve internet domain names/IPs.

Configuration of DNS Server:

  • Usage : To Resolve IP into hostname and vice-versa
  • Package : bind, caching-name
  • Script : /etc/init.d/named
  • Port : 53
  • Configuration File : /etc/named.conf
  • Document root : /var/named/
  • Daemon : named


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