version: '3.1'
services:
    coredns:
        build: 
          context: .
        container_name: corednsSM
        image: coredns-sm.image  # name of local image
        restart: always # other option: on-failure - if you want persistent through host reboots use always
        expose:
            - '53'
            - '53/udp'
        ports:
            - '53:53'
            - '53:53/udp'
        volumes:
            - './config:/etc/coredns'
        networks:
            - net

networks:
        net: