Mapping error in Docker Compose

Question

I'm still a newbie in the Docker area. I'm just getting confused about this from this Docker-run command:

docker run -d --name fritzbox_smarthome_exporter -p 9103:9103 \
  -v $(pwd)/boxcert.cer:/fritzbox.pem:ro \
  -e PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin \
  -e PASSWORD=ChefsPassWord \
  -e USERNAME=chef \
  jaymedh/fritzbox_smarthome_exporter '-noverify=false' '-url=http://fritz.box' '-cert=/fritzbox.pem'

to create a corresponding docker-compose.yml file.

Can someone enlighten a blind person? Thanks.

This is my design:

version: '3.8'
services:
  fritzbox_smarthome_exporter:
    image: 'jaymedh/fritzbox_smarthome_exporter:latest'
    restart: unless-stopped
    ports:
      - '9103:9103'
environment:
      USERNAME=Chef
      PASSWORD=cHefsPw
      PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
volumes: 
      - $(pwd)/boxcert.cer:/fritzbox.pem:ro
command: noverify=false url=http://192.168.0.2 cert=/fritzbox.pem

But Portainer throws the following error message:

failed to deploy a stack: validating /data/compose/25/docker-compose.yml: services.fritzbox_smarthome_exporter1.environment must be a mapping

Even if I replace the variable with the regular path on the system ( - /opt/fritz_smarthome_exporter/boxcert.cer:/fritzbox.pem:ro ), I get an error.

version: '3.8'
services:
  fritzbox_smarthome_exporter:
    image: 'jaymedh/fritzbox_smarthome_exporter:latest'
    restart: unless-stopped
    ports:
      - '9103:9103'
environment:
      USERNAME=Chef
      PASSWORD=cHefsPw
      PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
volumes: 
      - /opt/fritbox_smarthome_exporter/boxcert.cer /fritzbox.pem:ro
command: noverify=false url=http://192.168.0.2 cert=/fritzbox.pem

the Error: failed to deploy a stack: validating /data/compose/38/docker-compose.yml: volumes must be a mapping

can anyone help me ?

Answer 1

Indentation looks incorrect...Docker Composerize can help you: https://www.composerize.com

version: '3.3'
services:
    fritzbox_smarthome_exporter:
        container_name: fritzbox_smarthome_exporter
        ports:
            - '9103:9103'
        volumes:
            - ${PWD}/boxcert.cer:/fritzbox.pem:ro
        environment:
            PATH: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
            PASSWORD: ChefsPassWord
            USERNAME: chef
        labels:
            - 'http://fritz.box'
        image: jaymedh/fritzbox_smarthome_exporter
        restart: unless-stopped

Answer 2

The format of your environment variables is incorrect. Additionally, using bash expansion for the volume path won't work, but you can use a relative path:

version: '3.8'
services:
  fritzbox_smarthome_exporter:
    image: 'jaymedh/fritzbox_smarthome_exporter:latest'
    restart: unless-stopped
    ports:
      - '9103:9103'
    environment:
      USERNAME: Chef
      PASSWORD: cHefsPw
      PATH: "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
    volumes: 
      - ./boxcert.cer:/fritzbox.pem:ro
    command: "noverify=false url=http://192.168.0.2 cert=/fritzbox.pem"

You can read more about the docker compose file syntax in the official docs