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The above DNS configuration assumes that you will not be using IP-based virtual hosting and therefore does not create an A record for wwwnewdomaincom The A record line is commented out You can uncomment it if you use the IP-based virtual hosting method Because name-based virtual hosting does not require a unique IP address, a CNAME record is created to point wwwnewdomaincom to wwwdomaincom (which is the primary Web server)
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Here s what s going on in the preceding configuration: The first line starts a DNS record called the Start of Address (SOA), which specifies the serial number, refresh rate, retry rate, expiration time, and timeto-live (TTL) values The serial number is used by DNS servers to determine whether or not they need to update their cached records For example, the given example is set to 20011201001, which states that the last update was on 12/01/2001 and it is the first (001) change in that day Now if the DNS administrator changed the DNS configuration on 12/02/2001 the serial number should be changed to reflect that, so that any remote DNS server that has cached the records can compare the serial numbers between the cached version and the new version and decide whether to upload new DNS data The refresh rate says how often should the records be refreshed by the DNS server The retry value states that in case of a failure the remote DNS server querying this DNS server retry again at the given interval The expiration time tells remote DNS servers to forcefully expire any cached data they have on the given domain after specified number of days The final entry in SOA states that records have a specified minimal time-to-live value Note that anything following a semi-colon is treated as a comment line and ignored The next two noncomment lines state that the DNS servers responsible for the newdomaincom are ns1domaincom and ns2domaincom If you do not have a second DNS server, you should consider using a third-party secondary DNS service such as http://wwwsecondarycom
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You can set up DNS for each new virtual host on Linux as follows: 1 Create a zone file for the new domain (See the preceding section for more on zone files) 2 In the /etc/namedconf file, add the following lines to enable the newdomain zone
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zone newdomaincom IN { type master; file newdomainzone ; allow-update { none; }; };
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This tells the named (DNS daemon) that the zone file for newdomaincom is /var/named/newdomainzone and that it is the primary (master) DNS server for this zone
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3 Run the killall -HUP named command to force the name server to reload the /etc/namedconf and the new zone file 4 Try to ping wwwnewdomaincom If you do not get a response, check the /var/log/messages file for any typos or other errors that name server (named_) might have reported in either /etc/namedconf or /var/named/ newdomainzone files In such case, correct the typos or errors and restart the server as discussed in the previous step 5 Once you can ping the wwwnewdomaincom, you are ready to create Apache configuration for this virtual host as described in earlier sections of this chapter
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To provide virtual mail service for the new virtual hosts you add, you have to modify the newdomainzone file and add one or more appropriate MX record(s) For example, say that your mail server is maildomaincom and it is configured to accept mail for newdomaincom In such a case, you can modify the /var/named/ newdomainzone to be as follows:
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@ IN SOA newdomaincom 20011201002 7200 3600 1728000 3600) hostmasternewdomaincom( ; Serial YYYYMMDDXXX ; refresh ; (1 hour) retry ; (20 days) expire ; (1 hr) minimum ttl
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; Name Servers IN NS ns1domaincom IN NS ns2domaincom IN MX 10 maildomaincom ; CNAME for name-based virtual hosting wwwnewdomaincom IN CNAME wwwdomaincom
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Note that if you have multiple mail servers you can add them using a simple priority scheme For example, say that you want all mail for newdomaincom to go to mail domaincom and if this mail server is unavailable, you want to use bkupmail domaincom You can simply add a second MX record as shown here:
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