Add support for public Cloudflare DNS servers.

[everettsouthwick]

Signed-off-by: Everett Southwick everett@everettsouthwick.com

By submitting this pull request, I confirm the following:

• I have read and understood the contributors guide, as well as this entire template.
• I have made only one major change in my proposed changes.
• I have commented my proposed changes within the code.
• I have tested my proposed changes, and have included unit tests where possible.
• I am willing to help maintain this change if there are issues with it later.
• I give this submission freely and claim no ownership.
• It is compatible with the EUPL 1.2 license
• I have squashed any insignificant commits. (git rebase)

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What does this PR aim to accomplish?:

This pull request will add support for Cloudflare's new Public DNS servers (1.1.1.1 and 1.0.0.1) launched today.

Relevant issue:
#2072

How does this PR accomplish the above?:

It adds an option during install to choose Cloudflare's Public DNS servers.

What documentation changes (if any) are needed to support this PR?:

I'm not aware of any documentation changes that would be necessary.

[AzureMarker]

LGTM

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/add-default-support-for-cloudflare-dns/8486/2

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/1-1-1-1/8472/5

[jacobsalmela]

@everettsouthwick please contact me directly for a special thank you for contributing to our project.

[mibere]

What about the corresponding IPv6 addresses?

2606:4700:4700::1111
2606:4700:4700::1001

[LilSnoop40]

any chance i can remove all DNS except cloudflare... can't figure it out from the web admin page

Thanks

[PromoFaux]

Just add the cloudflare DNS servers to the Custom boxes, and untick the rest on the settings->DNS page of the web admin.

[LilSnoop40]

That is what i did and a few reboots of my router/pi-hole... any ideas?:

Thanks

[PromoFaux]

@LilSnoop40 can you open a new issue, please? There may be other factors about your installation that are causing issues here. Please make sure you follow the new issue template and we'll hopefully be able to get to the bottom of it. Cheers.

[PromoFaux]

@mibere see pi-hole/web#709

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/add-cloudflare-dns-servers/8780/5

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/cloudflare-upstream-dns-missing/10810/3