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Add systemd-resolved note for Fedora 

Fedora 33+ enables [systemd-resolved by default](https://fedoraproject.org/wiki/Changes/systemd-resolved), so the "Installing on Ubuntu" section becomes relevant for Fedora users as well.

This small change makes it possible to search the Readme for "Fedora" and find the solution instantly.

Signed-off-by: Frédérick Morin <freddydumont@users.noreply.github.com>
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Frédérick Morin 2022-08-15 16:46:25 -04:00 committed by GitHub
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@ -194,8 +194,8 @@ Here is a rundown of other arguments for your docker-compose / docker run.
* [Here is an example of running with nginxproxy/nginx-proxy](https://github.com/pi-hole/docker-pi-hole/blob/master/docker-compose-nginx-proxy.yml) (an nginx auto-configuring docker reverse proxy for docker) on my port 80 with Pi-hole on another port. Pi-hole needs to be `DEFAULT_HOST` env in nginxproxy/nginx-proxy and you need to set the matching `VIRTUAL_HOST` for the Pi-hole's container. Please read nginxproxy/nginx-proxy readme for more info if you have trouble.
* Docker's default network mode `bridge` isolates the container from the host's network. This is a more secure setting, but requires setting the Pi-hole DNS option for *Interface listening behavior* to "Listen on all interfaces, permit all origins".
### Installing on Ubuntu
Modern releases of Ubuntu (17.10+) include [`systemd-resolved`](http://manpages.ubuntu.com/manpages/bionic/man8/systemd-resolved.service.8.html) which is configured by default to implement a caching DNS stub resolver. This will prevent pi-hole from listening on port 53.
### Installing on Ubuntu or Fedora
Modern releases of Ubuntu (17.10+) and Fedora (33+) include [`systemd-resolved`](http://manpages.ubuntu.com/manpages/bionic/man8/systemd-resolved.service.8.html) which is configured by default to implement a caching DNS stub resolver. This will prevent pi-hole from listening on port 53.
The stub resolver should be disabled with: `sudo sed -r -i.orig 's/#?DNSStubListener=yes/DNSStubListener=no/g' /etc/systemd/resolved.conf`
This will not change the nameserver settings, which point to the stub resolver thus preventing DNS resolution. Change the `/etc/resolv.conf` symlink to point to `/run/systemd/resolve/resolv.conf`, which is automatically updated to follow the system's [`netplan`](https://netplan.io/):