Docker Compose : Which syntax produces a bind mount, 生成卷

Question

在 Docker Compose 文档中，here ，您有以下与 docker-compose.yml 文件的 volumes 部分相关的示例:

volumes:
  # (1) Just specify a path and let the Engine create a volume
  - /var/lib/mysql

  # (2) Specify an absolute path mapping
  - /opt/data:/var/lib/mysql

  # (3) Path on the host, relative to the Compose file
  - ./cache:/tmp/cache

  # (4) User-relative path
  - ~/configs:/etc/configs/:ro

  # (5) Named volume
  - datavolume:/var/lib/mysql

哪些语法会生成绑定(bind)挂载，哪些语法会生成docker 卷？在文档的某些地方，这两个概念是严格区分的，但在这个地方它们混合在一起......所以我不清楚。

Answer 1

每当您在评论中看到“音量”时，就会create a volume :所以(1)和(5)。

如果评论里没有卷的话，这是关于a bind mount .

documentation regarding volumes in docker-compose is here :

Mount host paths or named volumes, specified as sub-options to a service.

You can mount a host path as part of a definition for a single service, and there is no need to define it in the top level volumes key.

But, if you want to reuse a volume across multiple services, then define a named volume in the top-level volumes key.

The top-level volumes key defines a named volume and references it from each service’s volumes list. This replaces volumes_from in earlier versions of the Compose file format. See Use volumes and Volume Plugins for general information on volumes.