Domain name resolution

DNS: Domain Name Service (Domain Name Service)

Name resolution: host name resolution

Concept: the process of converting one name to another.

Name: String, number

LDAP: Lightweight Directory Service Access permission 389/tcp

Resolution: All root users provide one name to query the resolution database to obtain another name.

 

Root Domain: rootdomain

Level 1 domain: Root-level domain

Secondary domains: companies, organizations, and individuals

Host:

 

 

Resolution can be divided into two types:

Recursive parsing:

Iterative query:

 

I. Forward Parsing

Install bind

Check whether the BIND is installed and run the command rpm-Q bind;

Install command Yum install bind

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Main configuration file:/etc/named. conf,/etc/named. rfc1912.zone

Modify the main configuration file using the command Vim/etc/named. conf

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Definition region:

 

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After saving and exiting, run the named-checkconf command to check whether the syntax is correct.

 

 

 

CD/var/named/Bottom

Vim mageedu.com. Zone

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Test tool:

1. Host

2. NSLookup

3. Dig

 

 

 

 

 

Ii. Reverse Resolution:

Vim/etc/named. rfc1912.zone650) This. width = 650; "src =" http://s3.51cto.com/wyfs02/M00/44/86/wKioL1Ph4BKQ1HvnAAJlOIKAnbQ207.jpg "Title =" .png "alt =" wkiol1ph4bkq1hvnaajloikanbq207.jpg "/>

CD/var/named/

Edit in/var/named/create 172.16.100.zone

 

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Iii. DNS master-slave synchronization:

1. Time Synchronization;

2. The BIND version has the same master and slave; the master is low, and the slave is high;

 

Main zone definition:

CD/var/named/

Vim 127.16.100.zone

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Create a Slave region:

The version of the downloaded BIND is the same as that of the primary region, or the version is later than that of the primary region.

Modify Vim/etc/named. conf

 

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Configure Vim/etc/named. rfc1912.zone

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Startup command: rndc reload

 

 

Forward subdomain authorization:

Configure the primary domain

CD/var/named/

Edit Vim mageedu.com. Zone

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Start the virtual machine of the subdomain

Install bind. Run the yum install bind command.

Comment out the configuration file

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Service named start can be started directly.

Configure Vim/etc/named. rfc1912.zone

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CD/var/named/

Create ops.mageedu.com. Zone

Edit Vim ops.mageedu.com. Zone

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Iv. Bind View

Open Vim/etc/named. conf

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Edit Vim/etc/named. rfc1912.zone

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CD/var/named/

Vim mageedu.com.int

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Edit Vim mageedu.com. els

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Modify permissions

Chgrp root mageedu.com .*

Chmod 640 mageedu.com .*

Run the rndc reload command.

This article is from the regular expression blog, please be sure to keep this source http://hhxxb.blog.51cto.com/9152570/1536592