rules_helm

This repository contains Bazel rules to install and manipulate Helm charts with Bazel.

This allows you to describe Kubernetes applications in a deterministic manner.

Features

Tillerless - rules_helm uses tillerless helm.

Documentation

See Rule and macro defintions for macro documentation.

API

helm_chart - describes a helm chart.
helm_release - describes a helm release.

Getting started

In your Bazel WORKSPACE file add this repository as a dependency:

git_repository(
    name = "com_github_tmc_rules_helm",
    tag = "0.4.0",
    remote = "https://github.com/tmc/rules_helm.git",
)

Then in your BUILD files include the helm_chart and/or helm_release rules:

charts/a-great-chart/zBUILD:

load("@com_github_tmc_rules_helm//:helm.bzl", "helm_chart")

package(default_visibility = ["//visibility:public"])

helm_chart(
    name = "a_great_chart",
    srcs = glob(["**"]),
)

Referencing the chart with helm_release:

BUILD:

load("@com_github_tmc_rules_helm//:helm.bzl", "helm_release")

helm_release(
    name = "a_great_release",
    chart = "//charts/a-great-chart:chart",
    release_name = "a-great-release-1",
    values_yaml = "//:a-great-release-values.yaml",
)

This defines targets you can now use to manage the release:

:a_great_release.test.noclean
:a_great_release.test
:a_great_release.status
:a_great_release.install.wait
:a_great_release.install
:a_great_release.delete

You could now install, test, and clean up the chart via: bazel run :a_great_release.install.wait && bazel run :a_great_release.test && bazel run :a_great_release.delete

See rules_helm_examples for detailed usage examples.

Istio Example

These rules demonstrae describing an installation of Istio. See https://github.com/tmc/rules_helm_example/tree/master/charts/istio for details.

load("@com_github_tmc_rules_helm//:helm.bzl", "helm_release")

package(default_visibility = ["//visibility:public"])

helm_release(
    name = "istio_init",
    chart = "@com_github_istio_istio//:istio_init",
    namespace = "istio-system",
    release_name = "istio-init",
    values_yaml = ":istio_values.yaml",
)

helm_release(
    name = "istio",
    chart = "@com_github_istio_istio//:istio",
    namespace = "istio-system",
    release_name = "istio",
    values_yaml = ":istio_values.yaml",
)

The releases above create the following targets:

:istio_init.test.noclean
:istio_init.test
:istio_init.status
:istio_init.install.wait
:istio_init.install
:istio_init.delete

And:

:istio.test.noclean
:istio.test
:istio.status
:istio.install.wait
:istio.install
:istio.delete

Running bazel run :istio_init.install and a subsequent bazel run :istio.install (waiting for the CRDs to be created) will install Istio. See rules_helm_examples for detailed usage examples.