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I have an application that has a lot of worker servers, and the servers number is increasing with time, I want to assign a sub-domain for each one of these servers, for example: srv1.domain.com ... srv100.domain.com, my main goal is to serve files from them.

Beside creating an A DNS record for each one of these servers, is there a better way to do this ?

I checked the DNS records for a domain that has a similar setup, I've found that the root domain doesn't have any A records for the sub-domains, but the sub-domains have, for example:

Using dig:

$ dig rootdomain.com ANY

It showed the NS records without any A records at all for the sub-domains, but

$ dig srv1.sub.rootdomain.com ANY

Showed an A record pointing to the server, how is that possible ? and how can I have a similar setup ?

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You seem to be on the right path. If you intend to give each server an IP address, then you will need to create an A record for each server/sub-domain.

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  • What if the number increases a lot ? isn't there a limit for the records ?
    – Pierre
    Commented Nov 11, 2014 at 17:38
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    @Peter Only in regard to the number of IP addresses you have assigned. Otherwise, there is no limit. Case in point: subscriber lines, telecos that assign a sub-domain name per IP address that a user will use. Large scale DSL installations, for example, will use a single IP address and assigned sub-domain to identify the connection.
    – closetnoc
    Commented Nov 11, 2014 at 17:54

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