如何使用卷将数据保存在 dockerized postgres 数据库中 [英] How to persist data in a dockerized postgres database using volumes

问题描述

我的 docker compose 文件有三个容器，web、nginx 和 postgres.Postgres 看起来像这样:

My docker compose file has three containers, web, nginx, and postgres. Postgres looks like this:

postgres:
  container_name: postgres
  restart: always
  image: postgres:latest
  volumes:
    - ./database:/var/lib/postgresql
  ports:
    - 5432:5432

我的目标是在 postgres 容器内挂载一个与名为 ./database 的本地文件夹相对应的卷，作为 /var/lib/postgres.当我启动这些容器并将数据插入 postgres 时，我验证 /var/lib/postgres/data/base/ 是否充满了我添加的数据(在 postgres 容器中)，但在我的本地系统，./database 只在其中获取一个data 文件夹，即创建了./database/data，但它是空的.为什么?

My goal is to mount a volume which corresponds to a local folder called ./database inside the postgres container as /var/lib/postgres. When I start these containers and insert data into postgres, I verify that /var/lib/postgres/data/base/ is full of the data I'm adding (in the postgres container), but in my local system, ./database only gets a data folder in it, i.e. ./database/data is created, but it's empty. Why?

注意事项:

• 这表明我上面的文件应该可以工作.
• 这个人正在使用 docker 服务，很有趣

根据 Nick 的建议，我做了一个 docker inspect 并发现:

Per Nick's suggestion, I did a docker inspect and found:

    "Mounts": [
        {
            "Source": "/Users/alex/Documents/MyApp/database",
            "Destination": "/var/lib/postgresql",
            "Mode": "rw",
            "RW": true,
            "Propagation": "rprivate"
        },
        {
            "Name": "e5bf22471215db058127109053e72e0a423d97b05a2afb4824b411322efd2c35",
            "Source": "/var/lib/docker/volumes/e5bf22471215db058127109053e72e0a423d97b05a2afb4824b411322efd2c35/_data",
            "Destination": "/var/lib/postgresql/data",
            "Driver": "local",
            "Mode": "",
            "RW": true,
            "Propagation": ""
        }
    ],

这使得数据看起来像是被另一个我没有编写代码的卷窃取了.不知道为什么会这样.postgres 图像是否为我创建了该卷?如果是这样，是否有某种方法可以使用 那个卷 而不是我在重新启动时安装的卷?否则，是否有禁用其他卷并使用我自己的 ./database 的好方法?

Which makes it seem like the data is being stolen by another volume I didn't code myself. Not sure why that is. Is the postgres image creating that volume for me? If so, is there some way to use that volume instead of the volume I'm mounting when I restart? Otherwise, is there a good way of disabling that other volume and using my own, ./database?

我找到了解决方案，感谢尼克！(和另一个朋友)在下面回答.

I found the solution, thanks to Nick! (and another friend) Answer below.

推荐答案

奇怪的是，解决方案最终是改变

Strangely enough, the solution ended up being to change

volumes:
  - ./postgres-data:/var/lib/postgresql

到

volumes:
  - ./postgres-data:/var/lib/postgresql/data

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