How do I prepare Docker for a task?

Docker must be installed, running and able to access OfficeCubs’s data directory. The first preparation downloads and builds the shared sandbox image before tasks can use it.

Before you begin

A workspace determines where a teammate executes work and saves files. The environment is captured with a task, so changing a teammate later does not rewrite an earlier task. Local execution and Docker isolation have different permissions; read the selected mode before submitting real project data.

Steps

1. Start your Docker engine.
2. Choose Prepare sandbox in OfficeCubs.
3. Wait for image preparation to finish.
4. Try a small task with one attachment.

Example

On Docker Desktop or Colima, a data directory outside shared locations may need an explicit file-sharing setting before a workspace can mount.

Check the result

Read the preparation result and the task’s container-start events. Confirm that a real output file is created.

Limits and troubleshooting

OfficeCubs does not silently fall back to host execution when Docker is unavailable. Fix the sandbox error or deliberately choose another mode.