---
description: Configure Sandbox SDK deployments with Wrangler, Dockerfiles, environment variables, and transport modes.
title: Configuration
image: https://developers.cloudflare.com/og-docs.png
---

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> Documentation Index  
> Fetch the complete documentation index at: https://developers.cloudflare.com/sandbox/llms.txt  
> Use this file to discover all available pages before exploring further.

# Configuration

Last updated Aug 25, 2026|Copy as Markdown|[View as Markdown](https://66f4ea29.previews.developers.cloudflare.com/sandbox/configuration/index.md)|[Agent setup](https://66f4ea29.previews.developers.cloudflare.com/agent-setup/)

Configure your Sandbox SDK deployment with Wrangler, customize container images, and manage environment variables.

### [Wrangler configuration](https://66f4ea29.previews.developers.cloudflare.com/sandbox/configuration/wrangler/)

Configure Durable Objects bindings, container images, and Worker settings in wrangler.jsonc.

### [Dockerfile reference](https://66f4ea29.previews.developers.cloudflare.com/sandbox/configuration/dockerfile/)

Customize the sandbox container image with your own packages, tools, and configurations.

### [Environment variables](https://66f4ea29.previews.developers.cloudflare.com/sandbox/configuration/environment-variables/)

Pass configuration and secrets to your sandboxes using environment variables.

### [Transport modes](https://66f4ea29.previews.developers.cloudflare.com/sandbox/configuration/transport/)

Configure HTTP or RPC transport to optimize communication and avoid subrequest limits.

### [Sandbox options](https://66f4ea29.previews.developers.cloudflare.com/sandbox/configuration/sandbox-options/)

Configure sandbox behavior with options like `keepAlive` for long-running processes.

## Related resources

* [Get Started guide](https://66f4ea29.previews.developers.cloudflare.com/sandbox/get-started/) \- Initial setup walkthrough
* [Wrangler documentation](https://66f4ea29.previews.developers.cloudflare.com/workers/wrangler/) \- Complete Wrangler reference
* [Docker documentation ↗](https://docs.docker.com/engine/reference/builder/) \- Dockerfile syntax
* [Security model](https://66f4ea29.previews.developers.cloudflare.com/sandbox/concepts/security/) \- Understanding environment isolation

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