It’s a link in the place. So instead of making it readonly, you shall do this:

# ls -lh /etc/resolv.conf

lrwxrwxrwx 1 root root /etc/resolv.conf -> ../run/resolvconf/resolv.conf

Stop the systemd dns daemon running on port 53

$ sudo systemctl disable systemd-resolved
$ sudo systemctl stop systemd-resolved

Replace it with dnsmasq running on port 53.

$ sudo apt update
$ sudo apt purge dns-root-data -y
$ sudo apt install dnsmasq --no-install-recommends -y

Take back control of /etc/resolv.conf from //.

$ sudo unlink /etc/resolv.conf

Unlink to get back control of the resolv.conf from ”, then overwrite.

$ echo 'nameserver 127.0.0.1' | sudo tee /etc/resolv.conf
$ echo 'search localdomain' | sudo tee -a /etc/resolv.conf

How is the flow work:

System → resolv.conf (been controlled by other daemons **if not unlink**).
dnsmasq → hard-coded results /odoo.com/127.0.0.1 with wildcard match,**break;**
/etc/hosts with an exact match, **break;**
upstream DNS server, **break or timeout then continue
Other ns in resolv.conf if dnsmasq timeout, which would be several seconds.

Might need to edit`/etc/network/interfaces for persistent configuration, or the file `/etc/netplan/` on Ubuntu servers.

I would think you would have to configure your iPhone’s network settings to use the local DNS server.

DNS resolves hostnames to IP’s or the other way around it has nothing to do with URI’s i.e address=/example1.com/127.0.0.1 resolves example1.com to ip address 127.0.0.1 nothing more.

If you want some kind of redirect to configure it inside of your web server DNS can’t do this

any idea?

Also, how to add a default search domain on dnsmasq?