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Fix docs regarding custom Docker setup for sandboxes #28602

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Muhammad-Bin-Ali merged 1 commit into from
Feb 27, 2026
Merged

Fix docs regarding custom Docker setup for sandboxes #28602

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5 changes: 3 additions & 2 deletions src/content/docs/sandbox/configuration/dockerfile.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -137,10 +137,11 @@ COPY my-app.js /workspace/my-app.js
COPY startup.sh /workspace/startup.sh
RUN chmod +x /workspace/startup.sh

ENTRYPOINT ["/sandbox"]
CMD ["/workspace/startup.sh"]
```

The base image already sets the correct `ENTRYPOINT`, so you only need to provide a `CMD`. The sandbox binary starts the HTTP API server, then spawns your `CMD` as a child process with proper signal forwarding.

```bash title="startup.sh"
#!/bin/bash

Expand All @@ -156,7 +157,7 @@ wait
```

:::note[Legacy startup scripts]
If you have existing startup scripts that end with `exec bun /container-server/dist/index.js`, they will continue to work for backwards compatibility. However, we recommend migrating to the new approach using `ENTRYPOINT ["/sandbox"]` with `CMD` for your startup script.
If you have existing startup scripts that end with `exec bun /container-server/dist/index.js`, they will continue to work for backwards compatibility. However, we recommend migrating to the new approach using `CMD` for your startup script. Do not override `ENTRYPOINT` when extending the base image.
:::

## Related resources
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