Building dnsmasq docker-compose file with DHCP enabled

Creating Dockerfile

Create Dockerfile as below, the VOLUME /data is pointing to configuration folder

FROM ubuntu:latest

VOLUME /data

RUN apt update
RUN apt install dnsmasq -y
RUN apt install iproute2 -y

CMD dnsmasq -q -d --conf-file=/data/dnsmasq.conf --dhcp-broadcast

Creating docker-compose.yml file

Must add cap_add parameter.

version: '2'

services:
  dnsmasq:
    container_name: dnsmasq
    image: dnsmasq
    build:
      context: .
      dockerfile: Dockerfile.dnsmasq
    restart: unless-stopped
    volumes:
      - /app/dnsmasq/data:/data
    networks:
      - my_macvlan_250
    cap_add:
      - NET_ADMIN

networks:
  my_macvlan_250:
    external: true

This is the same as below command

docker run --cap-add=NET_ADMIN --name dnsmasq -d -it --restart unless-stopped -v /app/dnsmasq/data:/data --network my_macvlan_250 dnsmasq

References