DNS 도메인 추가2

NS Server을 다음과 같이 되도록 설정하시오.

Domain	IP	NS
server3.co.kr	10.10.33.3	server3.co.kr
www.server3.co.kr	10.10.33.3	server3.co.kr
centos3.co.kr	192.168.33.3	centos3.co.kr
www.centos3.co.kr	192.168.33.3	centos3.co.kr

1. IP Alias로 IP를 부여해준다.

- 참고
DNS 서버는 IP의 정보만 가지고 있으면 되므로 실제적으로 IP Alias 를 안해줘도 된다.
PING을 해보려면 IP Alias를 해주면 된다.

# ifconfig eth0:0 192.168.33.3 netmask 255.255.255.0 broadcast 192.168.255.255
# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:16:76:1C:2F:A5 
          inet addr:10.10.33.3  Bcast:10.10.255.255  Mask:255.255.0.0
          inet6 addr: fe80::216:76ff:fe1c:2fa5/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:47476 errors:0 dropped:0 overruns:0 frame:0
          TX packets:23687 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:32230969 (30.7 MiB)  TX bytes:4985521 (4.7 MiB)

eth0:0    Link encap:Ethernet  HWaddr 00:16:76:1C:2F:A5 
          inet addr:192.168.33.3  Bcast:192.168.255.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
- IP Alias를 통해 IP를 추가해 준 모습

lo        Link encap:Local Loopback 
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:2842 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2842 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1992006 (1.8 MiB)  TX bytes:1992006 (1.8 MiB)

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2. DNS의 환경설정파일

# vi /etc/named.rfc1912.zones - server3.co.kr, centos3.co.kr 에 대한 정보를 추가한다.

zone "server3.co.kr" IN {
        type master;
        file "server3.zone";
        allow-update { none; };
};

zone "33.10.10.in-addr.arpa" IN {
        type master;
        file "server3.rzone";
        allow-update { none; };
};


zone "centos3.co.kr" IN {
        type master;
        file "centos3.zone";
        allow-update { none; };
};

zone "33.168.192.in-addr.arpa" IN {
        type master;
        file "centos3.rzone";
        allow-update { none; };
};

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3. Zone 파일 설정

# pwd
/var/named/chroot/var/named - zone의 원본 파일이 있는 곳
# ls -l
-rw-r----- 1 root  named  198  5월 25  2008 localdomain.zone
-rw-r----- 1 root  named  426  5월 25  2008 named.local
# cp -p localdomain.zone server3.zone
# cp -p named.local server3.rzone


3-1. Forward zone
server3.zone
$TTL    86400
@               IN SOA  server3.co.kr. root.server3.co.kr. (
                                        42              ; serial (d. adams)
                                        3H              ; refresh
                                        15M             ; retry
                                        1W              ; expiry
                                        1D )            ; minimum
                IN NS           server3.co.kr.
                IN A            10.10.33.3
www             IN A            10.10.33.3

centos3.zone
$TTL    86400
@               IN SOA  centos3.co.kr. root.centos3.co.kr. (
                                        42              ; serial (d. adams)
                                        3H              ; refresh
                                        15M             ; retry
                                        1W              ; expiry
                                        1D )            ; minimum
                IN NS           cenros3.co.kr.
                IN A            192.168.33.3
www             IN A            192.168.33.3


3-2. Reverse zone

server3.rzone
$TTL    86400
@       IN      SOA     server3.co.kr. root.server3.co.kr.  (
                                      1997022700 ; Serial
                                      28800      ; Refresh
                                      14400      ; Retry
                                      3600000    ; Expire
                                      86400 )    ; Minimum
        IN      NS      server3.co.kr.
3       IN      PTR     server3.co.kr.
3       IN      PTR     www.server3.co.kr.

centos3.rzone
$TTL    86400
@       IN      SOA     centos3.co.kr. root.centos3.co.kr.  (
                                      1997022700 ; Serial
                                      28800      ; Refresh
                                      14400      ; Retry
                                      3600000    ; Expire
                                      86400 )    ; Minimum
        IN      NS      centos3.co.kr.
3       IN      PTR     centos3.co.kr.
3       IN      PTR     www.centos3.co.kr.

-참고
3 은 자신의 ip주소이다. 만약 이부분을 입력하지않으면 192.168.33.3에 대한 도메인 서버를 찾지 못한다.
ex)
# host 10.10.33.3
Host 3.33.10.10.in-addr.arpa not found: 3(NXDOMAIN)
# nslookup 10.10.33.3
Server:         10.10.33.3
Address:        10.10.33.3#53
** server can't find 3.33.10.10.in-addr.arpa: NXDOMAIN

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4. DNS Server 서비스를 재시작한다.

# service named restart
named를 정지 중:                                           [  OK  ]
named를 시작 중:                                           [  OK  ]

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5. DNS Server가 제대로 작동하는지 확인

# nslookup server3.co.kr
Server:         10.10.33.3
Address:        10.10.33.3#53

Name:   server3.co.kr
Address: 10.10.33.3

# nslookup www.server3.co.kr
Server:         10.10.33.3
Address:        10.10.33.3#53

Name:   www.server3.co.kr
Address: 10.10.33.3

# nslookup centos3.co.kr
Server:         10.10.33.3
Address:        10.10.33.3#53

Name:   centos3.co.kr
Address: 192.168.33.3

# nslookup www.centos3.co.kr
Server:         10.10.33.3
Address:        10.10.33.3#53

Name:   www.centos3.co.kr
Address: 192.168.33.3

# nslookup 192.168.33.3
Server:         10.10.33.3
Address:        10.10.33.3#53

3.33.168.192.in-addr.arpa       name = www.centos3.co.kr.
3.33.168.192.in-addr.arpa       name = centos3.co.kr.

# nslookup 192.168.33.3
Server:         10.10.33.3
Address:        10.10.33.3#53

3.33.168.192.in-addr.arpa       name = www.centos3.co.kr.
3.33.168.192.in-addr.arpa       name = centos3.co.kr.