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Suppose that a domain is hosted on multiple servers located geographically . So that domain will be having multiple ips .
I have some questions based on this
1 ) Does this domain have multiple db records ? if yes where would the db records be present ? if no , will the db record contain multiple ips for the domain
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e.g. if the domain is test.com , then will the db record be like
......................
.....................
test.com. IN A IP1
test.com. IN A IP2
test.com. IN A IP3
2 ) If a domain is hosted in multiple servers that spans geographically , what DNS method is used to service a client ( browser ) request with what ip ? i.e. who decides which ip to be served to the requesting client ? suppose that all the dns caches are cleared at all the levels ( at the client level , at the ISP level , and at the higher level too ) . So just suppose that the request ultimately reaches the root name servers in search of ip .
On searching further , i came across RRDNS ( Round Robin DNS ) that will serve a random ip for a client request . So i hope there is only a single db record with multiple A records for the domain .
Is there a way other than using /etc/hosts to make the domain resolve to a particular ip ( server ) of my interest ?
Round robin is used for server load balancing among several servers. It can be easily done using multiple A records for the same host in the domain's zone file.
Regarding the geographical redirection for a server there is a patch for bind.
So simply giving multiple A records in the zone file will load balance the server ? or is there anything else to be done to enable RRDNS ?
Yes using multiple A records for a host, allows bind to respond to a query for a host by giving the next ip address in a round robin fashion.
Quote:
Actually where is this RRDNS implemented ? Who has the privilege to do this ? People who are maintaining the root nameservers ?
For a dns server authoritative for a domain, this is done by the people responsible for that dns server.
If you are responsible for the domain.com, you have to setup the zone file for that domain like this:
Code:
domain.com. A 1.1.1.1
domain.com. A 2.2.2.2
domain.com. A 3.3.3.3
So basically if you install bind ( or any other dns package . Are there any other dns package other than bind ? Do you use the same windows compatible bind if you are using windows server ? ) RRDNS is default right ?
So basically if you install bind ( or any other dns package . Are there any other dns package other than bind ? Do you use the same windows compatible bind if you are using windows server ? ) RRDNS is default right ?
For bind (as I don't know for others), RRDNS is default behavior if you define multiple A records for the same host.
For other dns software take a look here
Quote:
Is there an alternative for RRDNS ?
You can use load balancing, either software based (like reverse proxies etc), or hardware based.
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