为什么从容器内部复制到已安装文件夹的文件没有出现在主机文件夹中？

Question

When I mount a host folder to my neo4j container the files from in that folder appear inside the containers directory and things work. However files that are inside the containers directory do not appear in the corresponding host folder - like the config file inside the container, located in the mounted conf folder.

version: "3"
services:
  cneo4j:
    image: neo4j:3.3.5
    container_name: cneo
    ports:
      - "7474:7474"
      - "7687:7687"
    environment:
      - VIRTUAL_PORT=80
      - VIRTUAL_HOST=db.localhost.vm
      - VIRUAL_ENABLE_SSL=True
      - LETSENCRYPT_HOST=db.localhost.vm
      - LETSENCRYPT_EMAIL=email@example.com
      - CERT_NAME=db.localhost.vm
    volumes:
      - /c/Users/moeter/cmcr/data/graph_main/neo4j/data:/data:rw
      - /c/Users/moeter/cmcr/data/graph_main/neo4j/logs:/logs:rw
      - /c/Users/moeter/cmcr/data/graph_main/neo4j/conf:/conf:rw
    restart: always

I am using Docker Toolbox for Windows.

Answer 1

A host volume will always map to the contents of the host directory, there is no merging of contents from the image or initialization of the host directory from the image. The process of populating the host directory has to be done by your container entrypoint or command. If there's initial data you want to load, that will need to be saved elsewhere in the image since you cannot access the image folder contents of they are hidden under a volume mount.