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There are several kinds of DNS server, each designed to perform a different type of task under the Domain Name Service. The basic kind of DNS server is the master server. Each network must have at least one master server that is responsible for resolving names on the network. Large networks may need several DNS servers. Some of these can be slave servers that can be updated directly from a master server. Others may be alternative master servers that hosts in a network can use. Both are commonly referred to as secondary servers. For DNS requests a DNS server cannot resolve, the request can be forwarded to specific DNS servers outside the network, say on the Internet. DNS servers in a network can be set up to perform this task and are referred to as forwarder servers. To help bear the workload, local DNS servers can be set up within a network that operate as caching servers. Such a server merely collects DNS lookups from previous requests it sent to the main DNS server. Any repeated requests can then be answered by the caching server. A server that can answer DNS queries for a given zone with authority is known as an authoritative server. An authoritative server holds the DNS configuration records for hosts in a zone that will associate each host's DNS name with an IP address. For example, a master server is an authoritative server. So are slave and stealth servers (see the list that follows). A caching server is not authoritative. It only holds whatever associations it picked up from other servers and cannot guarantee that the associations are valid.
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Master server This is the primary DNS server for a zone.
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Slave server A DNS server that receives zone information from the master server. Forwarder server A server that forwards unresolved DNS requests to outside DNS servers. Can be used to keep other servers on a local network hidden from the Internet. Caching only server Caches DNS information it receives from DNS servers and uses it to resolve local requests. Stealth server A DNS server for a zone not listed as a name server by the master DNS server. Note As an alternative to making entries in the configuration files manually, you can configure DNS with Linuxconf or Webmin.
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The configuration file for the named daemon is named.conf, located in the /etc directory. It uses a flexible syntax similar to C programs. The format enables easy configuration of selected zones, enabling features such as access control lists and categorized logging. The named.conf file consists of BIND configuration commands with attached blocks within which specific options are listed. A configuration command is followed by arguments and a block that is delimited with braces. Within the block are lines of option and feature entries. Each entry is terminated with a semicolon. Comments can use the C, C++, or Shell/Perl syntax: enclosing /* */, preceding //, or preceding #. The following example shows a zone statement followed by the zone name and a block of options that begin with an opening brace, {. Each option entry ends with a semicolon. The entire block ends with a closing brace, also followed by a semicolon. The format for a named.conf entry is show here, along with the different kinds of comments allowed. Table 25-4 lists several commonly used options.
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// comments /* comments */ # comments statements { options and features; //comments };
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The following example shows a simple caching server entry.
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// a caching only nameserver config // zone "." { type hint; file "named.ca"; };
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Option type file directory forwarders masters
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Table 25-4: Zone Options Description Specifies a zone type. Specifies the zone file for the zone. Specifies a directory for zone files. Lists hosts for DNS servers where requests are to be forwarded. Lists hosts for DNS master servers for a slave server.
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