Getting Started with GCP Vertex AI Gemini

This guide shows how to set up a minimal deployment to use the TensorZero Gateway with GCP Vertex AI Gemini.

Setup

For this minimal setup, you’ll need just two files in your project directory:

Directoryconfig/
- tensorzero.toml
docker-compose.yml

For production deployments, see our Deployment Guide.

Configuration

Create a minimal configuration file that defines a model and a simple chat function:

[models.gemini_1_5_flash_001]
routing = ["gcp_vertex_gemini"]

[models.gemini_1_5_flash_001.providers.gcp_vertex_gemini]
type = "gcp_vertex_gemini"
model_id = "gemini-1.5-flash-001"
location = "us-central1"
project_id = "your-project-id"  # change this

[functions.my_function_name]
type = "chat"

[functions.my_function_name.variants.my_variant_name]
type = "chat_completion"
model = "gemini_1_5_flash_001"

# Disable observability to keep this example minimal (not recommended in production)
[gateway]
disable_observability = true

See the list of models available on GCP Vertex AI Gemini.

Credentials

You must generate a GCP service account key in JWT form (described here) and point to it in the GCP_VERTEX_CREDENTIALS_PATH environment variable.

Deployment (Docker Compose)

Create a minimal Docker Compose configuration:

# This is a simplified example for learning purposes. Do not use this in production.
# For production-ready deployments, see: https://www.tensorzero.com/docs/gateway/deployment

services:
  gateway:
    image: tensorzero/gateway
    volumes:
      - ./config:/app/config:ro
      - ${GCP_VERTEX_CREDENTIALS_PATH:-/dev/null}:/app/gcp-credentials.json:ro
    environment:
      - GCP_VERTEX_CREDENTIALS_PATH=${GCP_VERTEX_CREDENTIALS_PATH:+/app/gcp-credentials.json}
    ports:
      - "3000:3000"

You can start the gateway with docker compose up.

Inference

Make an inference request to the gateway:

curl -X POST http://localhost:3000/inference \
  -H "Content-Type: application/json" \
  -d '{
    "function_name": "my_function_name",
    "input": {
      "messages": [
        {
          "role": "user",
          "content": "What is the capital of Japan?"
        }
      ]
    }
  }'