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If no matches are found, the DNS server will provide a result of notfound and the DNS query will fail. 1.3.2. Static Hostnames

Static hostnames are locally defined hostname-to-IP mappings located in the file /etc/hosts. Entries in the hosts file will have precedence over DNS by default. This means that if your system tries to resolve a hostname and it matches an entry in /etc/hosts, it will not attempt to look up the record in DNS. In some configurations, especially when Internet access is not required, servers that communicate with a limited number of resources can be conveniently set to use static hostnames instead of DNS.


The following is an example of a hosts file where a number of local servers have been identified by simple hostnames, aliases and their equivalent Fully Qualified Domain Names (FQDN's).


127.0.0.1 localhost

127.0.1.1 ubuntu-server

10.0.0.11 server1 server1.example.com vpn

10.0.0.12 server2 server2.example.com mail

10.0.0.13 server3 server3.example.com www

10.0.0.14 server4 server4.example.com file


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In the above example, notice that each of the servers have been given aliases in addition to their proper names and FQDN's. Server1 has been mapped to the name vpn, server2 is referred to as mail, server3 as www, and server4 as file.


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