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Configure auto image updater

When using the Workload feature in Otomi to deploy Helm charts from the Developer Catalog, then you can also use the Auto image updater feature to to automatically update the container images of Kubernetes workloads.

info

Otomi only supports the image update feature in combination with a Helm chart stored in the Developer Catalog.

Create a Workload with auto image updater​

Before creating a workload from the developer catalog, we'll need the repository and tag of the image we like to deploy. Go to the list of Builds and add the repository of the green build to your clipboard. Remember that the tag is latest.

You can now create a workload from the developer catalog:

  1. Go to Workloads in the left menu and click on Create Workload
  2. Select k8s-deployment from the catalog
  3. Add the Name green for the workload
  4. Set the Auto image updater to Digest and fill in the ImageRepository from the clipboard.

Digest is the update strategy and will update the image to the most recent pushed version of a given tag.

  1. In the workload values, change the following parameters:
image:
  repository: <paste from clipboard>
  tag: latest
  1. Click Submit

Now click on Deploy Changes

In the example above, we used the Digest update strategy. The Semver strategy allows you to track & update images which use tags that follow the semantic versioning scheme.

Expose the service​

Now go to the Expose services lab and expose the green service. When the service is created, go to Services in the left menu and click on the Url of the green service. What do you see?

Make code change to trigger a new build​

In the Trigger Builds lab we already created a Build called green and configured it with a trigger.

Now go to the green repo in Gitea and change the the welcome message:

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>Sample Deployment</title>
    <style>
      body {
        color: #ffffff;
        background-color: green
        font-family: Arial, sans-serif;
        font-size: 14px;
      }

      h1 {
        font-size: 500%;
        font-weight: normal;
        margin-bottom: 0;
      }

      h2 {
        font-size: 200%;
        font-weight: normal;
        margin-bottom: 0;
      }
    </style>
  </head>
  <body>
    <div align="center">
      <h1>Welcome to the improved Green app</h1>
    </div>
  </body>
</html>

And commit changes.

After the change has been committed, go to Services in the left menu and click on the Url of the green service. After a couple of minutes (note that the auto image update checks for changes every 2 minutes) you should see a green page saying Welcome to the improved Green app