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Docker – 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?

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2

Answers


  1. 0

    -v or –volume: This option is used by users in the docker run command to set up a bind mount at the time of the container run, mapping a host path to a container path.

    Binds in HostConfig: This only visible when you inspect a container, shows the actual bind mounts applied to the container as configured by -v or –mount or –volume. It’s not a command but a record of the mount configuration. it is recorded as part of the docker image build

    If we summerise, -v will create the mount, and Binds will reflect it in Docker’s internal configuration.

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  2. 0

    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.

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