[Question] Sandbox deployment fails with "AggregateError: All promises were rejected" - Scalebox template and setup inquiry

[lixingjia77]

Hi team,

I'm trying to deploy Refly using Docker Compose, but I'm encountering issues with the sandbox service when executing code.

Problem Description

When I try to use the code execution feature, the sandbox service returns an error:

AggregateError: All promises were rejected

What I've tried:
Deployment setup: Successfully started all containers using docker compose up -d

Scalebox API key configuration: Added PROVIDERS_SCALEBOX_API_KEY=sk-xxx to the .env file and restarted the refly-sandbox container

Error persists: After restarting, I still see the following errors in the logs:

{"level":"warn","error":{"name":"ScaleboxError"},"msg":"Race failed"}
{"level":"warn","error":{"name":"AuthenticationError"},"msg":"Race failed"}
{"level":"error","msg":"AggregateError: All promises were rejected"}
The logs show:

Scalebox pool fails with ScaleboxError
E2B pool fails with AuthenticationError (expected, as I don't have an E2B key)
The system is using "race mode" and both providers fail

Questions

1. Missing Configuration

Did I miss any required configuration steps? Are there any other environment variables or settings needed besides the API key?

2. Scalebox Template Availability

The docker-compose configuration uses slim-v2 as the default template name:

• PROVIDERS_SCALEBOX_TEMPLATE_NAME=${PROVIDERS_SCALEBOX_TEMPLATE_NAME:-slim-v2}

Questions:

Is the slim-v2 template publicly available on Scalebox?
Is the sandbox environment open-source?
Where can I find the template configuration or how do I create my own?

3. File Synchronization Approach

I'm curious about how file synchronization works between the sandbox and the storage (S3/MinIO):

Does the implementation use:

• Mount S3/MinIO directly as a filesystem (e.g., via s3fs/geesefs)?
• or, Sync files to/from a working directory using s3Config + s3DrivePath, then upload only the diff/changed files after execution?
  This information would help me understand the architecture better and potentially debug the issue.

Logs

Full sandbox logs

{"level":"info","context":"ScaleboxPool","apiKeySet":true,"msg":"ScaleboxPool initialized - verify template name"}
{"level":"info","context":"ProviderService","msg":"Use race mode"}
{"level":"info","context":"ScaleboxPool","templateName":"slim-v2","msg":"Creating new sandbox"}
{"level":"warn","context":"ProviderService","error":{"name":"ScaleboxError"},"msg":"Race failed"}
{"level":"error","context":"SubscriberService","error":"AggregateError: All promises were rejected","msg":"Request failed"}

Any guidance or documentation links would be greatly appreciated. Thank you!

[scalebox-dev]

Hi there. The slim-v2 template currently is NOT publicly available on Scalebox. But scalebox supports publishing a private template.