DNS na SPGrid

Primeiramente mudamos o /etc/resolv.conf

domain grid
nameserver 143.107.128.16
nameserver 143.107.128.17
nameserver 127.0.0.1
nameserver  200.204.0.10
nameserver 200.204.0.138

para colocar a spgrid como uma servidora de nomes

search     grid   localhost
nameserver 192.168.1.150
nameserver 143.107.128.17
nameserver 143.107.128.16
nameserver  200.204.0.10
nameserver 200.204.0.138

Mudamos agora o /etc/named.conf, incluindo a nossa zona no final

zone "grid" IN{
        type master;
        file "grid.hosts";
};

zone "1.168.192.in-addr.arpa" IN{
        notify yes;
        type master;
        file "grid.rev";
};

vamos usar um arquivo pré-existente para servir de modelo para o arquivo de parâm etros de nossa zona e poder edita-lo

[root@spgrid named]# cd /var/named
[root@spgrid named]# cp named.local grid.hosts

editando o grid.hosts para deixa-lo desta forma:

$TTL    86400
@       IN      SOA     spg00.grid. root.spg00.grid.  (
                                      1 ; Serial
                                      8H      ; Refresh
                                      2H      ; Retry
                                      1W    ; Expire
                                      1D )    ; Minimum
              IN      NS      spg00.grid.

ns       IN      A     192.168.1.150

agora vamos criar neste mesmo diretório o grid.rev

$TTL    86400
@       IN      SOA     spg00.grid. root.spg00.grid.  (
                                      1 ; Serial
                                      8H      ; Refresh
                                      2H      ; Retry
                                      1W    ; Expire
                                      1D )    ; Minimum
              IN      NS      grid.

1       IN      A     spg00.grid.

criar agora o /etc/hosts.conf

#/etc/hosts.conf
order hosts,bind
multi on

e agora iniciar o serviço

[root@spgrid named]# service named start
Starting named:                                            [  OK  ]
[root@spgrid named]# ntsysv

e selecione o serviço

[x] named

(com o tab). Dê Ok e assim o serviço estará na inicialização do sistema.

Testando

Pegue um node que não esteja ocupado e edite o /etc/resolv.conf:

* Tire qualquer nameserver

[root@node12:root]# ping  gdrb08.cern.ch
ping: unknown host gdrb08.cern.ch

• Colocando só a spgrid

[root@node12:root]# vim /etc/resolv.conf
[root@node12:root]# ping  gdrb08.cern.ch
PING gdrb08.cern.ch (137.138.154.172) 56(84) bytes of data.
64 bytes from gdrb08.cern.ch (137.138.154.172): icmp_seq=0 ttl=47 time=262 ms

• Volte na spgrid e pare o named

[root@spgrid named]# service named stop
Stopping named:                                            [  OK  ]

na máquina

[root@node12:root]# ping  gdrb08.cern.ch
ping: unknown host gdrb08.cern.ch

• Restart novamente na spgrid. Será qu conseguimos o DNS reverso?

[root@spgrid named]# service named start
Starting named:                                            [  OK  ]
[root@node12:root]# host 137.138.154.172
172.154.138.137.in-addr.arpa domain name pointer gdrb08.cern.ch.

Atualizando os nos

O script abaixo atualizou os n'os de 01 at'e 18

#!/bin/bash
for ((i=1; i<19; i++))
 do
ssh  192.168.1.$i "mv /etc/resolv.conf /etc/resolv.conf.old"
ssh   192.168.1.$i "echo domain grid| cat >>/etc/resolv.conf; echo nameserver 192.168.1.150| cat >>/etc/resolv.conf; e
cho nameserver 143.107.128.17| cat >>/etc/resolv.conf; echo nameserver 200.136.80.4| cat >>/etc/resolv.conf"
done