5

Note

Consider each subdomain as unique application instance

For information about application architecture visit

https://stackoverflow.com/questions/11272776/using-phusion-passenger-nginx-running-same-rails-app-with-multiple-instance

I am having one product going to provide to multiple clients with subdomains 

www.client1.product.com to www.client100.product.com in server 1 
with some static ip (x.x.x.1).

After 100 clients server 1 reaches maximum resource load and space, so i am buying another new server putting

www.client101.product.com to www.client200.product.com with ip (x.x.x.2) ,

consider i am using premium dns hosting for adding more than 100 A records. Is there any way to automate sub domain creation, by adding corresponding server ip to the A records.

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4

It will depend on your DNS hosting is done.

I personally use Zonomi. They have a DNS API. I can issue a request like https://zonomi.com/app/dns/dyndns.jsp?action=SET&name=mynewsubdomain.example.com&value=10.0.0.1&type=A&api_key=apikeyvaluehere to set the IP address for a new subdomain.

Another solution would be use use Route53 from Amazon Web Services (AWS). You can use the AWS JSON API or command line tool to modify DNS records at their Route53 DNS provider. The documentation for doing so is: https://docs.aws.amazon.com/cli/latest/reference/route53/change-resource-record-sets.html

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3
  • Thanks for sharing, i could see they are offering up to 150 DNS records, And i couldn't understand about DNS hosting units. Can you please explain for this newbie – Sam Mar 20 '13 at 17:51
  • That is their pricing structure. It ends up being one of the most reasonable "pay for what you use" pricing structures I have ever seen. The more DNS records you add, and the more domains you have, and the more DNS queries your users perform, the more they charge you. I usually use $1.24 worth of services per month. They will tell you what you will be charged based on your current setup, so you are never surprised. If you remove domains or records from them, your charges automatically drop accordingly. – Stephen Ostermiller♦ Mar 20 '13 at 17:57
  • And they offer unlimited DNS records. Their pricing is $5/year for every 50 of them. So if you have 500 you would be charged $4.16 each month ($50/12 months). – Stephen Ostermiller♦ Mar 20 '13 at 18:08

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