What is Binds for? Whats the difference with mounting a shared folder?

Upon inspect my docker container info shows:

"HostConfig": {
    "Binds": [
        "/opt/myconfig:/run/db_config:rw"
    ],

I suspect this works as a mounting volumes with:

-v mysql-data:/var/lib/mysql

But, I need to understand the difference between -v and whatever cmd created the Binds. Which cmd as -v could create the Binds entry?

The -v option on docker run can map both a docker volume or a host directory.

If the thing you're mapping is a directory or a file, docker creates a bind mount. If it's not, then docker creates a volume mapping.

For example,

docker run -v ./data:/data myimage

creates a bind mount, whereas

docker run -v data:/data myimage

creates a volume mount.

You can also be more explicit by using the --mount option instead. Using --mount is recommended, but as it's more verbose, most people use the -v option.

In your example, what created the bind mount would be an option like this

-v /opt/myconfig:/run/db_config

Mounts are read/write per default, so there's no reason to specify that.

You can read more here.