DNS service not running on Raspberry Pi 4B

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This issue is solved by adding the environment variable "DNSMASQ_USER" with the value of "root".

Here is my working docker-compose.yml file as an example:

version: "3"
services:
  pihole:
    container_name: pihole
    image: pihole/pihole:latest
    hostname: pihole1
    cap_add:
      - NET_ADMIN
    ports:
      - "53:53/tcp"
      - "53:53/udp"
      - "67:67/udp"
      - "8080:80/tcp"
    environment:
      - TZ=${TZ}
      - WEBPASSWORD=${WEBPASSWORD}
      - DNSMASQ_USER=root
    volumes:
      - ${DIRECTORY_PIHOLE}:/etc/pihole/
      - ${DIRECTORY_DNSMASQ}:/etc/dnsmasq.d/
    restart: unless-stopped

I will follow up this post with details of what I did to set up the docker container.