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Add warning about wildcard subdomains in DNS (#16846)

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Co-authored-by: Lucas Costi <lucascosti@users.noreply.github.com>
This commit is contained in:
Tammy Metz
2020-12-15 18:27:41 -05:00
committed by GitHub
parent 117a4ae6b5
commit 6feed158c2
3 changed files with 11 additions and 6 deletions
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6
content/github/working-with-github-pages/managing-a-custom-domain-for-your-github-pages-site.md
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@@ -40,7 +40,9 @@ To set up a `www` or custom subdomain, such as `www.example.com` or `blog.exampl
{% data reusables.pages.navigate-site-repo %}
{% data reusables.repositories.sidebar-settings %}
{% data reusables.pages.save-custom-domain %}
5. Navigate to your DNS provider and create a `CNAME` record that points your subdomain to the default domain for your site. For example, if you want to use the subdomain `www.example.com` for your user site, create a `CNAME` record that points `www.example.com` to `<user>.github.io`. If you want to use the subdomain `www.anotherexample.com` for your organization site, create a `CNAME` record that points `www.anotherexample.com` to `<organization>.github.io`. The `CNAME` file should always point to `<user>.github.io` or `<organization>.github.io`, excluding the repository name. {% data reusables.pages.contact-dns-provider %} {% data reusables.pages.default-domain-information %}
5. Navigate to your DNS provider and create a `CNAME` record that points your subdomain to the default domain for your site. For example, if you want to use the subdomain `www.example.com` for your user site, create a `CNAME` record that points `www.example.com` to `<user>.github.io`. If you want to use the subdomain `www.anotherexample.com` for your organization site, create a `CNAME` record that points `www.anotherexample.com` to `<organization>.github.io`. The `CNAME` record should always point to `<user>.github.io` or `<organization>.github.io`, excluding the repository name. {% data reusables.pages.contact-dns-provider %} {% data reusables.pages.default-domain-information %}
{% indented_data_reference site.data.reusables.pages.wildcard-dns-warning spaces=3 %}
{% data reusables.command_line.open_the_multi_os_terminal %}
6. To confirm that your DNS record configured correctly, use the `dig` command, replacing _WWW.EXAMPLE.COM_ with your subdomain.
```shell
@@ -71,6 +73,8 @@ To set up an apex domain, such as `example.com`, you must configure a _CNAME_ fi
185.199.110.153
185.199.111.153
```
{% indented_data_reference site.data.reusables.pages.wildcard-dns-warning spaces=3 %}
{% data reusables.command_line.open_the_multi_os_terminal %}
6. To confirm that your DNS record configured correctly, use the `dig` command, replacing _EXAMPLE.COM_ with your apex domain. Confirm that the results match the IP addresses for {% data variables.product.prodname_pages %} above.
```shell

6
content/github/working-with-github-pages/troubleshooting-custom-domains-and-github-pages.md
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@@ -39,11 +39,7 @@ Make sure your site does not:
- Use more than one `www` subdomain. For example, both `www.example.com` and `www.anotherexample.com`.
- Use both an apex domain and custom subdomain. For example, both `example.com` and `docs.example.com`.
{% warning %}
**Warning:** We strongly recommend not using wildcard DNS records, such as `*.example.com`. A wildcard DNS record will allow anyone to host a {% data variables.product.prodname_pages %} site at one of your subdomains.
{% endwarning %}
{% data reusables.pages.wildcard-dns-warning %}
For a list of supported custom domains, see "[About custom domains and {% data variables.product.prodname_pages %}](/articles/about-custom-domains-and-github-pages/#supported-custom-domains)."