> For the complete documentation index, see [llms.txt](https://docs.orbs.network/v3/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.orbs.network/v3/orbs-vm/step-by-step-overview/docker-image-implementation/entry-point.md).

# Entry Point

The executable inside your container that is launched by the orchestrator is `/opt/orbs/service` - this file must exist and must be executable. Failing to provide this file will prevent your container from starting.

## Shell script example

This example will use the shell script `entrypoint.sh` to run the primary process of your service. Let's assume the service is implemented with Node.js and starts with the command `npm start`. 

Create the file `entrypoint.sh` in the root of the image with the following content:

```shell
#!/bin/sh
npm start
```

Then, in your Dockerfile, copy this script over the required name:

```docker
# install entry point executable
COPY ./entrypoint.sh /opt/orbs/service
```