Copy folder content to a named volume in Docker

Question

I have a named volume:

{
    "CreatedAt": "2019-11-18T07:36:02Z",
    "Driver": "local",
    "Labels": null,
    "Mountpoint": "/var/lib/docker/volumes/example_uploads/_data",
    "Name": "example_uploads",
    "Options": null,
    "Scope": "local"
}

It's mounted to my container:

"Mounts": [
        {
            "Type": "volume",
            "Name": "example_uploads",
            "Source": "/var/lib/docker/volumes/example_uploads/_data",
            "Destination": "/var/www/html/wp-content/uploads",
            "Driver": "local",
            "Mode": "rw",
            "RW": true,
            "Propagation": ""
        }
    ]

I would like to copy the content (including sub folders) from a local folder to the volume. I have tried this:

docker cp folder-with-sub-folders container_name:/example_uploads

This doesn't return any errors but it's not working. The files are not being copied. I have used this answer as a guide: https://github.com/moby/moby/issues/25245#issuecomment-365980572

I would be very thankful if anyone could point me in the right direction to get this working.

Answer 1

You need to copy to the destination your volume is mounted to. In your case to /var/www/html/wp-content/uploads not example_uploads

docker cp folder-with-sub-folders container_name:/var/www/html/wp-content/uploads