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README.md

Hello Helm

This is a simple demo of an ACR webhook to automatically upgrade a Helm chart. The brigade.js is configured to upgrade a Helm release every time the specified Docker image is upgraded in an Azure Container Registry (ACR).

This is not production quailty. It is a demo.

To use this demo, you will need to point it to your own ACR repository. To do this, you will need to edit the registry in the following places:

  • Makefile
  • charts/values.yaml

Then you will need to configure your ACR to trigger a webhook on each push event.

Note: With a little bit of modification to the brigade.js, you can also use this for DockerHub webhooks.

Prerequisites

  • Helm and Brigade must be installed on your cluster
  • Your cluster must have a routable IP attached to the brigade-gw service
  • You must have an ACR created with type Managed
  • You need a clone of this repository
  • You need to configure a Slack incomming webhook. See Slack-Notify

Configuring ACR

You can either use the az acr webhook tool or use the webhooks panel in the Container Registry section of the Azure portal. You must configure the webhook to point to the Brigade gateway.

To get the external IP of the gateway, do:

$ kubectl get svc | brigade-gw

Set up your webhook to use http://<IP>:7744/events/dockerhub/<Project Name>/<Commit>.

  • The IP is the gateway IP from the command above (or a DNS address, if you set one up)
  • Project name is the name of your Brigade project (foo/bar)
  • Commit is the commit/branch/repo in the repo you want to use to fetch the brigade.js from, usually master

So if project name is technosophos/hello-helm, and the host is example.com, then the URL would be something like:

http://example.com:7744/events/dockerhub/technosophos/hello-helm/master

Configuring your Brigade project

If this is the first time you have used the Slack Notifier webhook, you need to add the Slack incomming webhook URL to your project.

Typically, you will want to edit the project's values.yaml overrides. But here's how to do it from the Helm commandline:

$ helm upgrade myproject brigade/brigade-project --set secrets.SLACK_WEBHOOK=https://rest/of/url

How it works

  • make docker-build docker-push pushes a new image
  • ACR responds to the push by calling the webhook
  • The webhook triggers a brigade event
  • The brigade event handler causes Helm to upgrade the chart with the new label

You can update the new build by running:

$ VERSION=0.1.2 make docker-build docker-push

The above will create a new tag for the image (0.1.2), which will trigger a new helm upgrade.

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