Книга: Linux Network Administrator Guide, Second Edition

Writing the Master Files

Writing the Master Files

Example 6.10, Example 6.11, Example 6.12, and Example 6.13 give sample files for a name server at the brewery, located on vlager. Due to the nature of the network discussed (a single LAN), the example is pretty straightforward.

The named.ca cache file shown in Example 6.10 shows sample hint records for a root name server. A typical cache file usually describes about a dozen name servers. You can obtain the current list of name servers for the root domain using the nslookup tool described in the next section.[43]

Example 6.10: The named.ca File

; /var/named/named.ca Cache file for the brewery.
; We're not on the Internet, so we don't need
; any root servers. To activate these; records, remove the semicolons.
;. 3600000 IN NS A.ROOT-SERVERS.NET.
;A.ROOT-SERVERS.NET. 3600000 A 198.41.0.4
;. 3600000 NS B.ROOT-SERVERS.NET.
;B.ROOT-SERVERS.NET. 3600000 A 128.9.0.107
;. 3600000 NS C.ROOT-SERVERS.NET.
;C.ROOT-SERVERS.NET. 3600000 A 192.33.4.12
;. 3600000 NS D.ROOT-SERVERS.NET.
;D.ROOT-SERVERS.NET. 3600000 A 128.8.10.90
;. 3600000 NS E.ROOT-SERVERS.NET.
;E.ROOT-SERVERS.NET. 3600000 A 192.203.230.10
;. 3600000 NS F.ROOT-SERVERS.NET.
;F.ROOT-SERVERS.NET. 3600000 A 192.5.5.241
;. 3600000 NS G.ROOT-SERVERS.NET.
;G.ROOT-SERVERS.NET. 3600000 A 192.112.36.4
;. 3600000 NS H.ROOT-SERVERS.NET.
;H.ROOT-SERVERS.NET. 3600000 A 128.63.2.53
;. 3600000 NS I.ROOT-SERVERS.NET.
;I.ROOT-SERVERS.NET. 3600000 A 192.36.148.17
;. 3600000 NS J.ROOT-SERVERS.NET.
;J.ROOT-SERVERS.NET. 3600000 A 198.41.0.10
;. 3600000 NS K.ROOT-SERVERS.NET.
;K.ROOT-SERVERS.NET. 3600000 A 193.0.14.129
;. 3600000 NS L.ROOT-SERVERS.NET.
;L.ROOT-SERVERS.NET. 3600000 A 198.32.64.12
;. 3600000 NS M.ROOT-SERVERS.NET.
;M.ROOT-SERVERS.NET. 3600000 A 202.12.27.33

Example 6.11: The named.hosts File

; /var/named/named.hosts Local hosts at the brewery
; Origin is vbrew.com
@ IN SOA vlager.vbrew.com. janet.vbrew.com. (
 2000012601; serial
 86400; refresh: once per day
 3600; retry: one hour
 3600000; expire: 42 days
 604800; minimum: 1 week
 IN NS vlager.vbrew.com.
; local mail is distributed on vlager
 IN MX 10 vlager
; loopback address
localhost. IN A 127.0.0.1
; Virtual Brewery Ethernet
vlager IN A 172.16.1.1
vlager-if1 IN CNAME vlager
; vlager is also news server
news IN CNAME vlager
vstout IN A 172.16.1.2
vale IN A 172.16.1.3
; Virtual Winery Ethernet
vlager-if2 IN A 172.16.2.1
vbardolino IN A 172.16.2.2
vchianti IN A 172.16.2.3
vbeaujolais IN A 172.16.2.4
; Virtual Spirits (subsidiary) Ethernet
vbourbon IN A 172.16.3.1
vbourbon-if1 IN CNAME vbourbon

Example 6.12: The named.local File

; /var/named/named.local Reverse mapping of 127.0.0
; Origin is 0.0.127.in-addr.arpa.
@ IN SOA vlager.vbrew.com. joe.vbrew.com. (
 1; serial
 360000; refresh: 100 hrs
 3600; retry: one hour
 3600000; expire: 42 days
 360000; minimum: 100 hrs
  IN NS vlager.vbrew.com.
1 IN PTR localhost.

Example 6.13: The named.rev File

; /var/named/named.rev Reverse mapping of our IP addresses
; Origin is 16.172.in-addr.arpa.
@ IN SOA vlager.vbrew.com. joe.vbrew.com. (
 16; serial
 86400; refresh: once per day
 3600; retry: one hour
 3600000; expire: 42 days
 604800; minimum: 1 week
 IN NS vlager.vbrew.com.
; brewery
1.1 IN PTR vlager.vbrew.com.
2.1 IN PTR vstout.vbrew.com.
3.1 IN PTR vale.vbrew.com.
; winery
1.2 IN PTR vlager-if2.vbrew.com.
2.2 IN PTR vbardolino.vbrew.com.
3.2 IN PTR vchianti.vbrew.com.
4.2 IN PTR vbeaujolais.vbrew.com.

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