My domain points to a rails app hosted on Heroku. Is it possible to have blog.mydomain.com point to a WordPress installation somewhere else, e.g. Dreamhost?
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Add a DNS A record to point the subdomain to the different server's ip address:
Depending on your domain provider most have a dns manager. in a normal setup that is untouched there would be 2 A records
if you used the Heroku nameservers then you need to make sure you setup the domain to use its built in dns manager and create new a records
Can you post your domain provider and wether or not you are using nameservers or dns manager
So once your you have access to your dns manager then you would create 1 new record and edit 1 record
edit your current @ record and point it to the ip address you have at Heroku then create a new a record with the host being blog and the "points to" to your new host ip address and you can leave the ttl at what ever value