How to Install and Configure DNS Server in Linux VM from scratch on ESXI
In this tutorial, we will explain how to install and configure a DNS server.
DNS stands for Domain Name System, or Domain Name Server.
DNS resolves an IP address to a hostname or vice versa.
DNS is basically a large database which resides on various computers that contains the names and IP addresses of various hosts/domains. Other than ip-address DNS also associates various information with the domain names.
A DNS zone database is made up of a collection of resource records. Each resource record specifies information about a particular object. The DNS server uses these records to answer queries for hosts in its zone. For example, address mapping (A) record, map a host name to an IP address, and reverse-lookup pointer (PTR) records map an IP address to a host name.
BIND stands for Berkley Internet Naming Daemon.
How to configure Iptables for DNS Server.
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192.168.0.104 Setup DNS Server https://www.tecmint.com/setup-master-slave-dns-server-in-centos/
#connect to yum server
yum install bind -y
yum install bind-utils -y
service named restart
netstat -anp | grep -w 53
vi /etc/named.conf
listen-on port 53 { 127.0.0.1; 192.168.0.104; }; #add ip addr.
allow-query { local host; 192.168.0.0/24; }; #add subnet
allow-transfer { localhost; 192.168.0.105; }; # Here we need to our Slave DNS server IP.
add
## Define our forward & reverse Zone file here for ddns.net
zone”ddns.net” IN {
type master;
file “dns.fwd.zone”;
allow-update { none; };
};
zone”0.168.192.in-addr.arpa” IN {
type master;
file “dns.rev.zone”;
allow-update { none; };
};
cd /var/named
cp -p named.localhost dns.fwd.zone
cp -p named.localhost dns.rev.zone
vi dns.fwd.zone
; Name server’s
@ IN NS dnsserver.ddns.net.
@ IN NS dnsslave.ddns.net.
; Hosts in this Domain
@ IN A 192.168.0.104
@ IN A 192.168.0.105
dnsclient IN A 192.168.0.99
yumserver IN A 192.168.0.103
nfsserver IN A 192.168.0.101
vi dns.rev.zone
; Name server’s
@ IN NS dnsserver.ddns.net.
@ IN NS dnsslave.ddns.net.
@ IN PTR ddns.net.
; Name server hostname to IP resolve.
DNSServer IN A 192.168.0.104
DNSSlave IN A 192.168.0.105
;Hosts in Domain
99 IN PTR dnsclient.ddns.net.
104 IN PTR dnsserver.ddns.net.
105 IN PTR dnsslave.ddns.net.
101 IN PTR nfsserver.ddns.net.
103 IN PTR yumserver.ddns.net.
# ls -l if you have root:root you have to change group to named
chgrp named /var/named/dns.fwd.zone
chgrp named /var/named/dns.rev.zone
ls -l /var/named
#check for the errors in zone files, before starting the DNS service
named-checkconf /etc/named.conf
named-checkzone dnsserver.ddns.net /var/named/dns.fwd.zone
named-checkzone dnsslave.ddns.net /var/named/dns.rev.zone
iptables -I INPUT -p udp –dport 53 -m state –state NEW -j ACCEPT
iptables -L INPUT
service iptables save
service iptables restart
chkconfig iptables on
service named start
chkconfig named on
#test the configured Master DNS zone files
nslookup ddns.net
nslookup dnsserver.ddns.net
nslookup dnsslave.ddns.net
192.168.0.105 Setup Slave DNS Server
#connect to yum server
yum install bind -y
yum install bind-utils -y
vi /etc/named.conf
listen-on port 53 { 127.0.0.1; 192.168.0.105; }; # Our Slave DNS server IP
allow-query { localhost; 192.168.0.0/24; };
recursion no;
## Define our slave forward and reverse zone, Zone files are replicated from master.
zone”ddns.net” IN {
type slave;
file “slaves/dns.fwd.zone”;
masters { 192.168.0.104; };
};
zone”0.168.192.in-addr.arpa” IN {
type slave;
file “slaves/dns.rev.zone”;
masters { 192.168.0.104; };
};
service named start
chkconfig named on
ls -l /var/named/slaves
#we don’t have to define the zone information individually,
#as our “allow-transfer” will replicate the zone information from master server
cat /var/named/slaves/dns.fwd.zone
cat /var/named/slaves/dns.rev.zone
iptables -I INPUT -p udp –dport 53 -m state –state NEW -j ACCEPT
service iptables save
service iptables restart
chkconfig iptables on
192.168.0.99 Configure Client Machine
setup Network Configuration
Primary DNS 192.168.0.104
Secondary DNS 192.168.0.105
vi /etc/resolv.conf
search ddns.net
dnsserver 192.168.0.104
dnsslave 192.168.0.105
ping dnsserver.ddns.net
ping dnsslave.ddns.net
ping 192.168.0.104
ping 192.168.0.105
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Finally, setup completed, here we have configured
both Primary (Master) and Slave (Seconday) DNS server successfully,
hope everyone have setup-ed without any issue,
feel free to drop a comment if you face any issue while setup.
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Create Free Hostname:
https://my.noip.com/#!/dynamic-dns
by Red Hat Man
linux dns configuration
