---
title: "Guides"
slug: "dev-dataengine-guides"
tags: ["DataEngine"]
updated: 2026-10-28T02:15:22Z
published: 2026-10-28T02:15:22Z
canonical: "docs.vastdata.com/dev-dataengine-guides"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vastdata.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Guides

Step-by-step instructions for building and running pipelines from the command line. Start with Write a function and Build and test locally; then Publish functions, Triggers and Pipelines as code take you to a deployed pipeline, and Observability shows what it's doing.

- **[Write a function](/develop/docs/dev-dataengine-guides-write-a-function)**: Write a DataEngine handler in Python: init and handler, reading each event type, chaining with return values, secrets, environment variables and dependencies.
- **[Build and test locally](/develop/docs/dev-dataengine-guides-build-and-test-locally)**: Build a function image with vastde functions build, run it locally with localrun and send it test events with invoke before deploying.
- **[Publish functions](/develop/docs/dev-dataengine-guides-publish-functions)**: Register a function image, release new versions as revisions, and choose whether a pipeline follows the latest revision or stays pinned.
- **[Triggers](/develop/docs/dev-dataengine-guides-triggers)**: Create element triggers for bucket changes and schedule triggers on a cron schedule, with the filters and syntaxes the cluster accepts.
- **[Pipelines as code](/develop/docs/dev-dataengine-guides-pipelines-as-code)**: Keep a pipeline in a Git-tracked YAML file: create, update and deploy it, chain functions, route events, and set retries.
- **[Observability](/develop/docs/dev-dataengine-guides-observability)**: Read and follow logs, inspect traces, and query built-in and custom metrics for a pipeline with vastde logs, traces and metrics.