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https://bendews.com/posts/implement-dns-over-https/, from the comment from apnar
====== compile CloudFlared et copie sur USG ======

putty dans /mnt/cache/cache_only/work/cloudflaredX
<code>
docker run --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp -e GOOS=linux -e GOARCH=mips golang bash -c "go get -v github.com/cloudflare/cloudflared/cmd/cloudflared; GOOS=linux GOARCH=mips go build -v -x github.com/cloudflare/cloudflared/cmd/cloudflared"
</code>

copier le binaire sur le USG
<code>
scp cloudflared brutus@192.168.1.1:~
</code>
- copy the MIPS cloudflared into /config/scripts/ on USG
<code>
cp /home/brutus/cloudflared /config/scripts/
</code>
- make sure it's executable: 
<code>
chmod +x /config/scripts/cloudflared
</code>

/config/scripts/post-config.d

=== cloudflare-dns.sh ===
<code>
#!/bin/bash
# start DNS proxy to Cloud Flare
/usr/bin/pkill cloudflared
nohup /config/scripts/cloudflared --no-autoupdate --proxy-dns --proxy-dns-port 5053 &>/var/log/cloudflared.log &
</code>
 
=========================================================

- make sure startup script is executable: 
  chmod +x /config/scripts/post-config.d/cloudflare-dns.sh

- add a custom config.gateway.json file on your controller so DNS config carries over on provisioning, here is what the relevant section of mine is:

  /mnt/cache/cache_only/appdata/unifi-controller/config

=== config.gateway.json ===
<code>
{
  "service":{
    "dns":{
      "forwarding": {
        "options": [
          "no-resolv",
          "strict-order",
          "server=127.0.0.1#5053",
          "server=1.1.1.1",
          "server=1.0.0.1",
          "domain=patatemagique.biz,192.168.1.1/24,local"
        ]
      }
    },
    "nat":{
      "rule":{
        "11":{
          "description":"Force Redirect to PiHole",
          "destination":{
            "port":"53"
          },
          "inbound-interface":"eth1",
          "inside-address":{
            "address":"192.168.1.253"
          },
          "source":{
            "address":"!192.168.1.253"
          },
          "log":"disable",
          "protocol":"tcp_udp",
          "type":"destination"
        },
        "6000":{
          "description":"Translate DNS to Internal",
          "destination":{
            "address":"192.168.1.253",
            "port":"53"
          },
          "log":"disable",
          "outbound-interface":"eth1",
          "protocol":"tcp_udp",
          "type":"masquerade"
        }
      }
    }    
  } 
}
</code>
===============================================================

- make sure the domain name in the file is the same as the one in Settings -> Network -> edit -> Domain Name, and the IP range matches as well.

- force a reprovision of your USG and reboot it to make sure everything starts up correctly

======  Few random notes ====== 

- supposedly everything in /config/scripts survives a firmware upgrade so that's why I picked that location

- scripts in /config/scripts/post-config.d seem to run on boot

- since you're using no-resolv, resolv.conf won't be read at all, so you need to manually set domain name for short names to work

- I added direct connections to cloudflare's DNS servers as 2nd and 3rd, but use strict-order so they will only be used if there is a problem with the DoH proxy

- the log file flag to cloudflared doesn't seem to work when using it for dns-proxy so need to use redirect to capture log info

- haven't done anything about log rotation yet, but cloudflared doesn't seem to chatty