docker - 卷和 docker-compose

Question

我正在尝试创建一个 docker-compose.yml 文件，其中包含 --volumes-from操作说明。有人知道语法吗？

我在网上找了一段时间，似乎是--volumes-from命令仅可用作 docker 命令。我希望我是错的。

Answer 1

2016 年 2 月:
docs/compose-file.md 提到:

Mount all of the volumes from another service or container, optionally specifying read-only access(ro) or read-write(rw).

(如果未指定访问级别，则将使用读写。)

volumes_from:
 - service_name
 - service_name:ro
 - container:container_name
 - container:container_name:rw

例如( from this issue 或 this one )

version: "2"

services:
...
  db:
    image: mongo:3.0.8
    volumes_from:
      - dbdata
    networks:
      - back
    links:
      - dbdata

 dbdata:
    image: busybox
    volumes:
      - /data/db

注意 2017 年 8 月:与 docker-compose version 3, regarding volumes :

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.

例子:

version: "3.2"
services:
  web:
    image: nginx:alpine
    volumes:
      - type: volume
        source: mydata
        target: /data
        volume:
          nocopy: true
      - type: bind
        source: ./static
        target: /opt/app/static

  db:
    image: postgres:latest
    volumes:
      - "/var/run/postgres/postgres.sock:/var/run/postgres/postgres.sock"
      - "dbdata:/var/lib/postgresql/data"

volumes:
  mydata:
  dbdata:

This example shows a named volume (mydata) being used by the web service, and a bind mount defined for a single service (first path under db service volumes).

The db service also uses a named volume called dbdata (second path under db service volumes), but defines it using the old string format for mounting a named volume.

Named volumes must be listed under the top-level volumes key, as shown.