Can you provide a detailed introduction on how to use Overlaybd independently

[MingWangSong]

What is the version of your Overlaybd

No response

What would you like to be added?

Detailed introduction to how to use Overlaybd independently

Why is this needed for Overlaybd?

Vegetable chicken for help

Are you willing to submit PRs to contribute to this feature?

• Yes, I am willing to implement it.

[BigVan]

https://github.com/containerd/overlaybd#standalone-usage

We have a description about using overlaybd standalone.
I think use this config.json will create an empty read-only ext4 device:

{
      "repoBlobUrl": "",
      "lowers" : [
          {
              "file" : "/opt/overlaybd/layer0"
          }
      ],
      "resultFile": "/home/overlaybd/1/result"
}

[MingWangSong]

https://github.com/containerd/overlaybd#standalone-usage

We have a description about using overlaybd standalone. I think use this config.json will create an empty read-only ext4 device:

{
      "repoBlobUrl": "",
      "lowers" : [
          {
              "file" : "/opt/overlaybd/layer0"
          }
      ],
      "resultFile": "/home/overlaybd/1/result"
}

Thank you for your answer. I have seen these configurations before, but I am curious about how to use this service after configuring and starting it?