# Entrypoint and Protocol
source: https://docs.chalk.ai/docs/scaling-groups/entrypoint-and-protocol

## Override a scaling group's container entrypoint, and serve gRPC instead of HTTP.

This page covers the command a scaling group's replicas
run, and the protocol its route forwards.

### Entrypoint override

To override the image's default entrypoint, pass entrypoint from the SDK or
--entrypoint from the CLI. These examples run Python's built-in HTTP server on
the public python:3.12-slim image:

```
import chalkcompute

sg = chalkcompute.ScalingGroup(
    image="python:3.12-slim",
    name="custom-server",
    port=8000,
    entrypoint=["python", "-m", "http.server", "8000"],
).deploy()
```

```
$ chalk scaling-group create \
    --image=python:3.12-slim \
    --name=custom-server \
    --max-replicas=1 \
    --port=8000 \
    --entrypoint="python,-m,http.server,8000"
```

The CLI takes comma-separated arguments; the SDK takes a list.

### gRPC services

To serve gRPC instead of HTTP, set protocol="grpc" from the SDK or pass
--grpc from the CLI. The group's route then forwards gRPC traffic to your
container's port.