I have a query regarding setting up servers.
Suppose I have multiple websites to host.
foo.com bar.com hello.com
I may or may not to have specific servers for them. Suppose an arbitrary configuration is something like this (with the respective domain registrar)
foo.com A 18.104.22.168 bar.com A 22.214.171.124 hello.com A 126.96.36.199
What I would like is to give each website a universal domain to point to instead of an IP (since IP can change).
something like the following.
foo.com CNAME service.com bar.com CNAME service.com hello.com CNAME service.com
From what I have understood about DNS so far,
- I think I will need to setup a DNS server at service.com which returns the appropriate records.
- Is this correct?
- If so what if domain is held with a domain registrar? such as dreamhost. How to handle it then?
- Since they respond to DNS queries, how do I insert that layer of indirection?
Achieve transparent server migration from client's perspective
Ultimately what I would like to achieve is that if I were to one day host hello.com from a different server, I would only have to modify in 1 place at the server rather then tell the client to change their DNS config.
I use rackspace, they also have something called reverse DNS. Is that useful?
I noticed for google Apps - we always point to ghs.google.com and they forward the request to appropriate IP. So it must be possible, but I just can't figure out how to achieve it.