Entrypoint and Protocol

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

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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.

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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.