###########################################################################
$TTL 3600
@	IN SOA @ enub2.com. sysadmin.enub2.com. (
				0	; serial
				1D	; refresh
				1H	; retry
				1W	; expire
				3H )	; minimum
	NS 	@
	IN A	192.168.10.29
www	IN A	192.168.10.30
mail	IN CNAME 


#############################################################################
DNS ( Domain Name Service / System)
	-DNS	=> Domain Name Service
	-DNS	=> Naming Service
	-DNS	=> Forward [  IP to Name ]
			=> Reverse [ Name to IP ]

https://i1.wp.com/www.cialfor.com/infosec/wp-content/uploads/2016/02/hierarchy-of-domain-names.gif
		

Linux DNS Service
* Forward အတွက်
1. /etc/named.conf => configure လုပ် zone ဆောက်
2. cp /var/named/named.localhost   /var/named /-------.zone
3. vi /var/named/------.zone

Record ထည့်


* Reverse အတွက်
1. /etc/named.conf => configure လုပ်  zone ဆောက်
2. cp /var/named/named.loopback /var/named/---.rev

3. vi /var/named/-----.rev



Example ############################
$TTL 1D
@   IN SOA  epc.example.com   root.epc.example.com. (
                                       2017031301      ; serial
                                       1D              ; refresh
                                       1H              ; retry
                                       1W              ; expire
                                       3H )            ; minimum

$ORIGIN         example.com.
example.com.            IN      NS      epc.example.com.
epc                     IN      A       127.0.0.1
server                  IN      A       192.168.25.1
www                     IN      CNAME   server
mail                    IN      CNAME   server
test1                   IN      A       192.168.25.21
t1                      IN      CNAME   test1
test2                   IN      A       192.168.25.22
test3                   IN      A       192.168.25.23
test4                   IN      A       192.168.25.24

; Mail server MX record
example.com.            IN      MX      10      mail.example.com.




#########################################################################################
groupadd apple
useradd tom -g add
useradd jerry -g apple
vim /etc/httpd/conf.d/userdir.conf
	userdir disable
	userdir public_html
getsebool httpd_read_user_content
setsebool httpd_red_user_content 1
mkdir /home/tom/public_html
mkdir /home/jerry/public_html
vim /home/tom/public_html/hello.html
vim /home/jerry/public_html/hello.html

chown -R tom:apple /home/tom
chown- R jerry:apple /home/jerry
chmod 701 /home/tom
chmod 701 /home/jerry
chmod 751 /home/tom/public_html
chmod 751 /home/jerry/public_html
chmod 644 /home/tom/public_html/hello.html
chmod 644 /home/jerry/public_html/hello.html
systemctl start httpd
http://host??/~user/hello.html