لطفا منتظر باشید ...
Starting and
Testing the Server
You can start the DNS server in any of the
ways discussed in
although it's usually run from a SysV startup script or occasionally from a
custom startup script. Running a DNS server from a super server produces slower
name lookups, which is undesirable.A tool that's particularly helpful for
testing the operation of a name server is host . This program ships
with most Linux distributions, often in a package called bind-utils or
something similar. The host utility looks up a name or address using a specified name server. In
its simplest form, it uses whatever the default name server is for the computer
on which it runs, as specified in /etc/resolv.conf . You can use it by typing
its name followed by a hostname or IP address, thus: $ host www.awl.com www.awl.com is a nickname for awl.com awl.com has address 165.193.123.224
In this example, the first line of output
indicates that www.awl.com is an alias (via a CNAME record) for awl.com . This
system has the IP address 165.193.123.224. Such a test confirms that the name
server is working for outside resolution. If you've configured your own domain,
you should test its function using local hostnames and addresses as well. Be
sure to test both forward and reverse lookups, if appropriate. You can also
look up specific record types by specifying them with the -t option. For
instance, to find the MX records for a domain, you might enter a command like
the following: $ host -t MX awl.com awl.com mail is handled by 100 mailhost.uu.net. awl.com mail is handled by 10 oldtms702.pearsontc.com. awl.com mail is handled by 20 oldtms701.pearsontc.com.
This test shows that awl.com has
three mail servers oldtms702.pearsontc.com has the highest priority (10), followed by oldtms701.pearsontc.com (priority 20), and mailhost.uu.net (priority 100). If you
want to test a specific DNS server, you can append its name or IP address to
the command, thus: $ host www.awl.com spruce Using domain server: Name: spruce.threeroomco.com Address: 192.168.1.3 Aliases: www.awl.com is a nickname for awl.com awl.com has address 165.193.123.224
This output is the same as that from the
first command, but it adds confirmation that host used a particular
DNS server to enter its query.You can find more information on host from its
man page. You may also want to investigate nslookup , which performs
a similar function, but is being abandoned in favor of host .
