5 linux managing dns servers lpic 2 m5 slides kho tài liệu training

$ dig pluralsight.com -t mx$ dig pluralsight.com +short -t mx... use strict; use warnings; use Net::DNS::Resolver; my $hostname; print“Enter a hostname: “; chomp$hostname = ;... $ sudo a

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$ nslookup -querytype=mx pluralsight.com

$ nslookup

 server 127.0.0.1

 set type=mx

 pluralsight.com

 ………

 set debug

 web.theurbanpenguin.com

$ dig pluralsight.com -t mx

$ dig pluralsight.com +short -t mx

$ host www.pluralsight.com # Returns A Record

$ host 8.8.8.8 # Returns PTR Record

use strict;

use warnings;

use Net::DNS::Resolver;

my $hostname;

print(“Enter a hostname: “); chomp($hostname = <STDIN>);

my $resolver = Net::DNS::Resolver->new(

nameservers => [qw(8.8.8.8)],

);

my $query = $resolver->search($hostname);

if ($query) {

foreach my $record ($query->answer) {

next unless $record->type eq "A";

print(“Answer: " $record->address "\n");

}

}

$ sudo apt-get install -y python3-dnspython

import dns.resolver

resolver = dns.resolver.Resolver()

answers = resolver.query("docker.theurbanpenguin.com","A") for answer in answers:

print(answer)

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