I have been figuring out how to accomplish this for a day now and read through a bunch of tutorials but could not make it work the way I wanted.
So my current set up is that I have a website that I registered the domain with Namecheap, let's call it mywebsite.com. The main app is hosted on Heroku, so both mywebsite.com and www.mywebsite.com is set up as URL redirect and CNAME to point to the heroku address. For example I have a CNAME record for www pointing to www.mywebsite.com.herokudns.com. This works fine and I would like to keep it that way.
I recently registered for a SiteGround service to set up my wordpress blog. I would like it to be accessible at blog.mywebsite.com. Most of the tutorial I have seen is to either migrate the domain to siteground so the wordpress site can point to the main domain or to point the namecheap DNS nameservers to the siteground one which I don't want to do neither because I do not want to redirect the traffic away from the heroku app.
I have tried to set up NSRecord according to Namecheap doc, I added the record for blog to point to ns1.siteground1111.com (the nameservers siteground provided) but when I entered blog.mywebsite.com it said server not found. I am on a SiteGround shared IP plan and I can see the blog if I visit ns1.siteground205.com/~myusername. However creating A record or CNAME requires bare IP and domain so I wonder if that's the issue.
My question is if my approach was correct in trying to set up the subdomain by creating a NSRecord on Namecheap pointing to SiteGround's nameservers. Or is it necessary for me to pay extra and get a dedicated IP address from SiteGround for me to point my A record for blog to.
Alternatively, I also have extra domains I am not using and I could set SiteGround blog to those domains and perhaps create a CNAME record for blog.mywebsite.com to www.myotherwebsite.com? That sounds like an overcomplication of the issue but I am not sure what to try at this point.
Really appreciate any help!