create a pure data image in docker

Question

I know that in docker we can run data volume containers like this ``` #create a pure data container based on my data_image docker run -v /data --name data-volume-container data-vol-container-img # here I'm using the data volume in a property container (ubuntu) docker run --volumes-from data-volume-container ubuntu ``` my question is how do we create the data_image? I know that the easiest way is to create a image based on ubuntu, or anything like that ``` From ubuntu Copy data /data CMD["true"] ``` But the thing is , why do I need ubuntu as my base image??? (I know it's not a big deal as ubuntu is going to re-used in other scenarios). I really want to know why can't I use scratch?? ``` FROM scratch COPY data /data #I don't know what to put here CMD ["???"] ``` The image i'm creating here is meant to be a dummy one, it execute absolutely NOTHING and only act a dummy data container, i.e to be used on in `docker run -v /data --name my_dummy_data_container my_dummy_data_image` Any ideas??…

Accepted Answer

Yes, you can do this `FROM scratch`.

A `CMD` is required to create a container, but Docker doesn't validate it - so you can specify a dummy command:

```
FROM scratch
WORKDIR /data
COPY file.txt .
VOLUME /data
CMD ["fake"]
```

Then use `docker create` for your data container rather than `docker run`, so the fake command never gets started:

```
> docker create --name data temp
55b814cf4d0d1b2a21dd4205106e88725304f8f431be2e2637517d14d6298959
```

Now the container is created so the volumes are accessible:

```
> docker run --volumes-from data ubuntu ls /data
file.txt
```

create a pure data image in docker

Solution

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