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DEVELOPMENT.md

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Development

This document describes development guidelines for Presto Helm charts.

Running locally

Minikube can be used to deploy the chart and run Presto locally for testing purposes.

The following commands start minikube instance and open Kubernetes cluster dashboard in the default web browser:

minikube start --cpus=4 --memory=8g --addons=ingress --addons=ingress-dns
minikube dashboard

Debugging chart templates

Linting

Use helm lint to examine the chart by running a series of tests for potential issues or errors. The command takes a path to the chart and validates that the chart is well-formed.

For instance, the following command validates Presto Helm chart with enabled Ingress:

helm lint charts/presto --set ingress.enabled=true

Rendering templates

Use helm template --debug to render the chart templates locally.

For example, the command below checks templates correctness with enabled Ingress:

helm template my-presto charts/presto --set ingress.enabled=true --debug

Simulate installation

Use helm install --dry-run --debug to simulate the chart installation and print rendered templates. The command generates manifests and sends them to the Kubernetes API server for verification. It is useful to check if the chart and configuration are valid for a specific Kubernetes cluster.

The following command simulates Presto Helm chart installation with enabled Ingress:

helm install my-presto charts/presto --set ingress.enabled=true --dry-run --debug