As you probably know, you can create username.github.io, and Github will host your static website. What if you want this username.github.io to be a different domain name that you purchased on namecheap? Let’s say that I have buhpc.github.io, and I want it to be buhpc.com, which I have purchased on namecheap. How exactly do I do that?
Add CNAME to username.github.io
We should add CNAME to our username.github.io. We can easily do this through the terminal or website GUI. I’ll show you how to add a new file called CNAME on the website GUI. We’ll visit http://github.com/buhpc/buhpc.github.io. There’s a New file button next to New pull request button. Click it.
Now, we name the file, CNAME. Inside the large text box, we write the name of the domain that we have purchased on Namecheap. For me, I wrote buhpc.com inside the file. At the bottom, we click the Commit new file, green button.
Now, what we see is that we have committed the CNAME file, and it appears within our git repo.
Adding the Host Records to Namecheap
We visit https://namecheap.com and log into our account. On the list of domains that we own, hit Manage next to the domain that we want to link to github.io.
Now, we want to select the Advanced DNS tab.
At the bottom, we can add the following four Host Records as part of the Advanced DNS.
A Record @ 220.127.116.11 Automatic
A Record @ 18.104.22.168 Automatic
CNAME Record www username.github.io Automatic
CNAME Record www domain Automatic
Make sure that you hit Save All Changes.