Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Scaricare il pdf (Pagina 229)

Chapter 17. Berkeley Internet Name Domain (BIND) 229

IN A 10.0.1.3

server1 IN A 10.0.1.5

Figure 17-8. Example A records

Requests for domain.com are pointed to 10.0.1.3, while requests for server1.domain.com are

pointed to 10.0.1.5.

• CNAME — Canonical name record, which tells the nameserver that one name is also known as

another.

alias-name IN CNAME real-name

Figure 17-9. Sample CNAME record conﬁguration

In Figure 17-9, any requests sent to the alias-name will point to the host named real-

name

. CNAME records are most commonly used to point services that use a common naming

scheme to the correct host.

Consider the example in Figure 17-10, where an A record sets a particular hostname to an IP address

and a CNAME record points the commonly used www hostname to it.

server1 IN A 10.0.1.5

www IN CNAME server1

Figure 17-10. Example CNAME record

• MX — Mail eXchange record, which tells where mail sent to a particular namespace controlled by

this zone should go.

IN MX

preference-value email-server-name

Figure 17-11. Sample MX record conﬁguration

In Figure 17-11, the preference-value allows you to numerically rank the email servers

you would prefer to receive email for this namespace, giving preference to some email systems

over others. The MX resource record with the lowest

preference-value is preferred over the

others, but you can set multiple email servers with the same value to distribute email trafﬁc between

them.

The email-server-name may be a hostname or FQDN, as long as it points to the correct

system.

IN MX 10 mail.domain.com.

IN MX 20 mail2.domain.com.

Figure 17-12. Example MX records

In this example, the ﬁrst mail.domain.com email server is preferred to the mail2.domain.com

email server when receiving email destined for the domain.com domain.

• NS — NameServer record, which announces the authoritative nameservers for a particular zone.

IN NS

nameserver-name

Figure 17-13. Sample NS record conﬁguration

The nameserver-name should be a FQDN.

In Figure 17-14, two nameservers are listed as authoritative for a domain. It is not important whether

these nameservers are slaves or if one is a master; they are both still considered authoritative.

1 2 ... 224 225 226 227 228 229 230 231 232 233 234 ... 281 282

Commenti su questo manuale

Nessun commento

Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Pagina 229

Commenti su questo manuale

Prodotti e manuali riguardandi Software di system management Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE