Article Title: RedHat6.2 server configuration solution (1): DNS. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
Author: Tang haijing
Chapter 1: DNS
1.1 Introduction
The most basic service in a TCP/IP network is domain name resolution. That is, you can access your website through IP or URL. In addition, domain name resolution should also provide users with the naming service, that is, the user executes ftp 192.168.10.1 and executes ftp thj is the same.
1.2 Required System Resources
1.2.1 configuration file:
/Var/named. local caching-nameserver-6.2-2.noarch.rpm
/Var/named. ca caching-nameserver-6.2-2.noarch.rpm
/Var/named/name2ip. conf administrator create
/Var/named/ip2name. conf administrator create
1.2.2 related tools:
File Name Source
/Etc/rc. d/init. d/named bind-8.2.2_P5-9
/Usr/bin/nslookup bind-8.2.2_P5-9
Bind-8.2.2_P5-9/usr/sbin/ndc
1.3 configuration Scheme
The configuration of the DNS server involves five main files, and four other files are also related to DNS:
1./etc/named. conf configuration file
Role: defines the basic parameters and source points of the domain database information. The file can be stored on a local or remote server.
Instance:
Options {
Directory "/var/named ";
# Defines the path for named to read and write files
};
Zone "."{
Type hint;
# Indicates that the file used to initialize the Domain Name Server at startup is a clue file,
Each server has a clue area.
File "named. ca ";
# Specify the file name to be read
};
Zone "0.0.127.in-addr. arpa "{
Type master;
# Indicates that the server is a primary Domain Name Server
File "named. local ";
};
Zone "mycompany.com" in {
Type master;
File "name2ip. conf ";
};
Zone "10.168.192.in-addr. arpa "{
Type master;
File "ip2name. conf ";
};
2./var/named/name2ip. conf forward parsing File
Role: defines domain information, implements the image between the host name and address, recognizes the mail server, and provides various domain information.
Instance:
@ In soa thj.mycompany.com. root.thj.mycompany.com.
# All partition files start with SOA, @ specifies the current information source, thj.mycompany.com
This value can be used to connect the domain name with named. conf. There is usually only one @ symbol.
(2000062900; serial # serial number
28800; refresh # refresh cycle, in seconds
14400; retry # cycle
3600000; expire # Stop Time
86400); minuum # time-to-live time
In ns thj.mycompany.com.
# Define a Domain Name Server
In mx 10 thj.mycompany.com.
# Define the email server. "10" indicates the priority. The smaller the value, the higher the priority.
Localhost in a 127.0.0.1
# Map domains to IP addresses
Thj in a 192.168.10.1
Www CNAME thj
# The two names before and after CNAME are equivalent names
Mail CNAME thj
3./var/named/ip2name. conf reverse parsing File
Purpose: Implement domain name ing of IP addresses
Instance:
@ In soa thj.mycompany.com. root.thj.mycompany.com.
(2000062900; serial
28800; refresh
14400; retry
3600000; expire
86400); minuum
In ns thj.mycompany.com.
In mx 10 thj.mycompany.com.
1 in ptr thj.mycompany.com.
# Define the inverse relationship, that is, between 192.168.10.1 and thj.mycompany.com
Can also be used to define a reverse domain.
4./var/named. local host parsing File
Purpose: Resolve the return address localhost, that is, 127.0.0.1. The return address is a special convention, that is, the method for processing the local address is the same as that for processing the remote address, this simplifies the processing process and does not necessarily send data to the physical network.
Instance:
@ In soa localhost. root. localhost .(
1997022700; Serial
28800; Refresh
14400; Retry
3600000; Expire
86400); Minimum
In ns localhost.
1 in ptr localhost.
5./var/named. ca clue File
Purpose: Initialize the buffer information. This file does not need to be changed by the administrator, but comes with the system.
Instance:
. 3600000 in ns A.ROOT-SERVERS.NET.
A.ROOT-SERVERS.NET. 3600000 A 198.41.0.4
. 3600000 NS B .ROOT-SERVERS.NET.
B .ROOT-SERVERS.NET 3600000 A 128.9.0.107
. 3600000 NS C.ROOT-SERVERS.NET.
C.ROOT-SERVERS.NET. 3600000 A 192.33.4.12
. 3600000 NS D.ROOT-SERVERS.NET.
D.ROOT-SERVERS.NET. 3600000 A 128.8.10.90
. 3600000 NS E.ROOT-SERVERS.NET.
E.ROOT-SERVERS.NET. 3600000 A 192.203.230.10
. 3600000 NS F.ROOT-SERVERS.NET.
F.ROOT-SERVERS.NET 3600000 A 192.5.5.241
. 3600000 NS G.ROOT-SERVERS.NET.
G.ROOT-SERVERS.NET. 3600000 A 192.112.36.4
. 3600000 NS H.ROOT-SERVERS.NET.
H.ROOT-SERVERS.NET. 3600000 A 128.63.2.53
. 3600000 NS I .ROOT-SERVERS.NET.
I .ROOT-SERVERS.NET. 3600000 A 192.36.148.17
. 3600000 NS J.ROOT-SERVERS.NET.
J.ROOT-SERVERS.NET. 3600000 A 198.41.0.10
. 3600000 NS K.ROOT-SERVERS.NET.
K.ROOT-SERVERS.NET. 3600000 A 193.0.14.129
. 3600000 NS L.ROOT-SERVERS.NET.
L.ROOT-SERVERS.NET 3600000 A 198.32.64.12
. 3600000 NS M.ROOT-SERVERS.NET.
M.ROOT-SERVERS.NET. 3600000 A 202.12.27.33
6./etc/hosts
Purpose: map to other major computers on the Internet. It is usually used as a DNS backup, that is, the Hosts table is used when the DNS system encounters a problem.
Instance:
127.0.0.1 localhost. localdomain localhost
192.168.10.1 thj.mycompany.com thj
# Since each server has several domain names that correspond to IP addresses permanently, they should be stored in the Hosts table.
7./etc/resolv. conf
Purpose: Specify the IP address and search sequence of the Domain Name Server.
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.
