AdGuard Home (or other DSN-based ADBlocker)

Hi all!

Just a quick question - I am looking to deploy a DNS AdBlocker like AdGuard Home or PiHole but I'm having some struggles as port 53 TCP and UDP are in use.

As such the container fails to deploy and, I don't want to map 53 to another port, as otherwise the clients would not be able to connect.

From netstat I can see that the port for both UDP and TCP is allocated to systemd-resolved.

user@server:~# netstat -tulpn | grep ":53 "
tcp        0      0 127.0.0.53:53           0.0.0.0:*               LISTEN      794/systemd-resolve
udp        0      0 127.0.0.53:53           0.0.0.0:*                           794/systemd-resolve

I'm not hosting any other DNS-serving container on Docker and, on OMV itself, I only have enabled SMB/CIFS, SSH and RSync Server.

Could anyone help me in understanding why that port is in use and how I could free it so to map it to the container?

Thank you!

Thank you gderf ,

In Portainer I had mapped 0.0.0.0:53 to port 53 in the container.

I guess that takes any address, including 127.0.0.1.

Would you suggest me to just bind that one of the IPs of the server instead?

Makes sense - thanks!