I so desperately want to bash my head into a hard surface. I cannot figure out what is causing this issue. The full error is as follows:

Error: cannot listen on the UDP port: listen udp4 :53: bind: address already in use

This is my compose file:

version: "3"
services:
  pihole:
    container_name: pihole
    image: docker.io/pihole/pihole:latest
    ports:
      - "53:53/tcp"
      - "53:53/udp"
      - "80:80/tcp"
    environment:
      TZ: '<redacted>'
    volumes:
      - './etc-pihole:/etc/pihole'
      - './etc-dnsmasq.d:/etc/dnsmasq.d'
    restart: unless-stopped

and the result of # ss -tulpn:

Netid       State        Recv-Q       Send-Q                             Local Address:Port               Peer Address:Port       Process                                         
udp         UNCONN       0            0                    [fe80::e877:8420:5869:dbd9]:546                           *:*           users:(("NetworkManager",pid=377,fd=28))       
tcp         LISTEN       0            128                                      0.0.0.0:22                      0.0.0.0:*           users:(("sshd",pid=429,fd=3))                  
tcp         LISTEN       0            128                                         [::]:22                         [::]:*           users:(("sshd",pid=429,fd=4))        

I have looked for possible culprit services like systemd-resolved. I have tried disabling Avahi. I have looked for other potential DNS services. I have rebooted the device. I am running the container as sudo (so it has access to all ports). I am quite at a loss.

• Raspberry Pi Model 1 Model B Rev 2
• Raspbian (bookworm)
• Kernel v6.6.20+rpt-rpi-v6
• Podman v4.3.1
• Podman Compose v1.0.3

EDIT (2024-03-14T22:13Z)

For the sake of clarity, # netstat -pna | grep 53 shows nothing on 53, and # lsof -i -P -n | grep LISTEN shows nothing listening to port 53 — the only listening service is SSH on 22, as expected.

Also, as suggested here, I tried manually binding to port 53, and I was able to without issue.