Configure ArgoCD image updater

In the previous part, you have seen how to use ArgoCD to automatically deploy applications by adding the Kubernetes manifests in to the gitops repo in Gitea. You can also use ArgoCD to deploy Helm charts and automatically update the version of the deployed image.

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ArgoCD currently only supports the image update feature in combination with a Helm chart.

Upload a Helm chart to Harbor

You can do this in the Harbor UI, or directly with the helm CLI:

• Login to the team's OCI registry first, by using the push credentials for your team provided by the platform administrator.

helm registry login -u 'otomi-team-demo-push' -p $token harbor.<your-domain>

• Upload the chart:

helm push <chart-name>.tgz oci://harbor.<your-domain>/library/<chart-name>

Connect the repo in ArgoCD

• In the apps section in Otomi console, click on the ArgoCD app
• Open Settings > Repositories
• Choose Connect Repo using https
• Fill in the following:
  • Type: Helm
  • Name: Harbor
  • Project: <team-name>
  • Repository URL: https://harbor.<your-domain>/chartrepo/library
• Click Connect

Create a new ArgoCD application

• Select Applications, and click on Create
• Fill in the following:
  • Application Name: <your-app-name>
  • Project: <team-name>
  • Sync Policy: Automatic
  • Repository URL: harbor.<your-domain>/chartrepo/library
  • Chart: <chart-name>
  • Version: <version>
  • Cluster URL: https://kubernetes.default.svc
  • Namespace: <team-name>
• Click on Create

You'll see that the chart is now automatically deployed.

Configure ArgoCD Image Updater

• In ArgoCD, go to applications and click on the new created application
• Click on App Details and then edit
• Under Annotations, add the following annotation (example):

argocd-image-updater.argoproj.io/image-list: "otomi/nodejs-helloworld:~1.2"

• Now click Save

In the example above, we used the semver update strategy. Read more about the supported update strategies here