til

Setting up Custom Subdomain for GitHub Pages

Follow the steps from https://docs.github.com/en/pages/configuring-a-custom-domain-for-your-github-pages-site/managing-a-custom-domain-for-your-github-pages-site?platform=linux#configuring-a-subdomain, log into a DNS provider such as WHC, click “Manage”, click the gear icon, click “Advanced DNS Manager”, go to DNS Records, and add a record:

Name: til.da
TTL: 3600 (Middle-ground. WHC defaults to 14440. Cloudflare defaults to 300¹. Cloudflare doesn’t charge for DNS queries on the Free plan²)
Type: CNAME
Value: lydavid.github.io

Verify using dig. Make sure the GitHub Pages servers appears.

dig til.da.vidly.ca +nostats +nocomments +nocmd

;til.da.vidly.ca.               IN      A
til.da.vidly.ca.        0       IN      CNAME   lydavid.github.io.
lydavid.github.io.      0       IN      A       185.199.111.153
lydavid.github.io.      0       IN      A       185.199.108.153
lydavid.github.io.      0       IN      A       185.199.109.153
lydavid.github.io.      0       IN      A       185.199.110.153

Go to https://github.com/lydavid/til/settings/pages, and set the custom domain as til.da.vidly.ca.

See an error saying:

til.da.vidly.ca is improperly configured Domain does not resolve to the GitHub Pages server. For more information, see documentation (NotServedByPagesError).

But this is expected. Just wait for DNS propagation³.

I waited before pushing this, and it did work.

https://developers.cloudflare.com/dns/manage-dns-records/reference/ttl/ ↩
https://developers.cloudflare.com/dns/troubleshooting/faq/#does-cloudflare-charge-for-or-limit-dns-queries ↩
https://stackoverflow.com/a/54078569 ↩

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