For orderer6 container

docker-compose-orderer6.yaml

version: '2'

volumes:
  orderer6.example.com:

networks:
  byfn:

services:

  orderer6.example.com:
    extends:
      file: base/peer-base.yaml
      service: orderer-base
    container_name: orderer6.example.com
    networks:
    - byfn
    volumes:
        - ./channel-artifacts/latest_config.block:/var/hyperledger/orderer/orderer.genesis.block
        - ./crypto-config/ordererOrganizations/example.com/orderers/orderer6.example.com/msp:/var/hyperledger/orderer/msp
        - ./crypto-config/ordererOrganizations/example.com/orderers/orderer6.example.com/tls/:/var/hyperledger/orderer/tls
        - orderer6.example.com:/var/hyperledger/production/orderer
    ports:
    - 12050:7050