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This section discusses the makeup of the name server database files, ie, the files that store specific information that pertains to each zone that the server hosts The database files consist mostly of record types therefore, you need to understand the meaning and use of the common record types for DNS: SOA, NS, A, PTR, CNAME, MX, TXT, and RP
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SOA: Start of Authority
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The SOA record starts the description of a site s DNS entries The format of this entry is as follows:
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1) 2) 3) 4) 5) 6) 7) domainname IN SOA nsdomainname hostmasterdomainname ( 1999080801 ; serial number 10800 ; refresh rate in seconds (3 hours) 1800 ; retry in seconds (30 minutes) 1209600 ; expire in seconds (2 weeks) 604800 ; minimum in seconds (1 week) )
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Line numbers have been added to the preceding listing to aid readability
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The first line contains some details you need to pay attention to: domainname is, of course, to be replaced with your domain name This is usually the same name that was specified in the zone directive in the /etc/namedconf file Notice that last period at the end of domainname It s supposed to be there indeed, the DNS configuration files are extremely picky about it The ending period is necessary for the server to differentiate relative hostnames from fully qualified domain names (FQDNs); for example, the difference between serverA and serverAexampleorg
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IN tells the name server that this is an Internet record There are other types of records, but it s been years since anyone has had a need for them You can safely ignore them SOA tells the name server this is the Start of Authority record The nsdomainname is the FQDN for the name server for this domain (that would be the server where this file will finally reside) Again, watch out and don t miss that trailing period The hostmasterdomainname is the e-mail address for the domain administrator Notice the lack of an @ in this address The @ symbol is replaced with a period Thus, the e-mail address referred to in this example is hostmaster@domainname The trailing period is used here, too The remainder of the record starts after the opening parenthesis on line 1 Line 2 is the serial number It is used to tell the name server when the file has been updated Watch out forgetting to increment this number when you make a change is a mistake frequently made in the process of managing DNS records (Forgetting to put a period in the right place is another common error) NOTE To maintain serial numbers in a sensible way, use the date formatted in the following order: YYYYMMDDxx The tail-end xx is an additional two-digit number starting with 00, so if you make multiple updates in a day, you can still tell which is which Line 3 in the list of values is the refresh rate in seconds This value tells the secondary DNS servers how often they should query the primary server to see if the records have been updated Line 4 is the retry rate in seconds If the secondary server tries but cannot contact the primary DNS server to check for updates, the secondary server tries again after the specified number of seconds Line 5 specifies the expire directive It is intended for secondary servers that have cached the zone data It tells these servers that if they cannot contact the primary server for an update, they should discard the value after the specified number of seconds One to two weeks is a good value for this interval The final value (line 6, the minimum) tells caching servers how long they should wait before expiring an entry if they cannot contact the primary DNS server Five to seven days is a good guideline for this entry TIP Don t forget to place the closing parenthesis (line 7) after the final value
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