DNS Service Setup

Environmental Science

centos7

Expected results

dns The server : 10.122.1.84

Allow the requested scope : 10.122.0.0/16

build dns service

Installation services

   yum -y install bind
   yum -y install bind-utils

Edit profile

   vim /etc/named.conf

   options {

       listen-on port 53 { 10.122.1.84; };		
       //listen-on-v6 port 53 { 10.122.1.84; };
       directory       "/var/named";			#  Address file location 
       dump-file       "/var/named/data/cache_dump.db";
       statistics-file "/var/named/data/named_stats.txt";
       memstatistics-file "/var/named/data/named_mem_stats.txt";
       recursing-file  "/var/named/data/named.recursing";
       secroots-file   "/var/named/data/named.secroots";
       allow-query     { 10.122.0.0/16; };
   .......

   .......

   include "/etc/named.rfc1912.zones";

   include "/etc/named.root.key";

named-checkconf Confirm the configuration file syntax

If you want to do some website assignments , Add a new configuration file and add it in /etc/named.rfc1912.zones Import , Or not

   vim /etc/named.rfc1912.zones 	#  Because the main configuration file is for /etc/named.rfc1912.zones the include,  So you can make additional configuration here ,  You can also edit in the new configuration file and then in the main configuration file include

   zone "hello.com" IN{					#  Forward configuration 
       type master;
       file "hello.com.zone";
       allow-update{none;};
   };

   zone "1.122.10.in-addr.arpa" IN {			#  Reverse configuration 
       type master;
       file "hello.com.local";
       allow-update{none;};
   };

   cd /var/named

   cp -p named.localhost  hello.com.zone

   vim hello.com.zone

   $TTL 1D

   @       IN SOA  @ rname.invalid. (
                                       0       ; serial
                                       1D      ; refresh
                                       1H      ; retry
                                       1W      ; expire
                                       3H )    ; minimum
       NS      @
       A       10.122.1.85
   www     IN A    10.122.1.85				#  take www.hello.com Point to 10.122.1.85
   ftp     IN A    10.122.1.85				#  take ftp.hello.com Point to 10.122.1.85
       AAAA    ::1

   cp -p hello.com.zone hello.com.local

   vim hello.com.local

   $TTL 1D

   @       IN SOA  @ rname.invalid. (
                                       0       ; serial
                                       1D      ; refresh
                                       1H      ; retry
                                       1W      ; expire
                                       3H )    ; minimum
       NS      @
       A       10.122.1.84
   85      IN PTR  www.hello.com						#  take 10.122.1.85 Point to www.hello.com
       AAAA    ::1
   systemctl restart named

1. Client test
2. modify /etc/resolv.conf Do a temporary test
3. Test forward and reverse dns

  [email protected] ~# nslookup  10.122.1.85

  85.1.122.10.in-addr.arpa	name = www.hello.com.1.122.10.in-addr.arpa.

  [email protected] ~# nslookup www.hello.com

  Server:		10.122.1.84

  Address:	10.122.1.84#53

  Name:	www.hello.com

  Address: 10.122.1.85

utilize ansible Batch modify the network card configuration so that dns Completion and effectiveness

  ansible all -m lineinfile -a 'path=/etc/sysconfig/network-scripts/ifcfg-ens192 regexp=^DNS1 line="DNS1=10.122.1.84"'

  ansible all -m shell -a 'systemctl restart network'