This walkthrough deploys a full end-to-end pipeline demonstrating how OCM and Flux can be employed to deploy applications in air-gapped environments.
The demo environment consists of Gitea, Tekton, Flux and the OCM controller. Two Gitea organizations are created:
The provider organization contains a repository which models the podinfo application. When a new release is created a Tekton pipeline will be triggered that builds the component and pushes it to the software provider's OCI registry.
The software consumer organization models an air-gapped scenario where applications are deployed from a secure OCI registry rather than directly from an arbitrary upstream source.
The software consumer organization contains a repository named ocm-applications. During the setup of the demo a PR is created which contains the Kubernetes manifests required to deploy the component published by the software provider.
Once this pull request is merged the Flux machinery will deploy the dependency weave-gitops and subsequently the podinfo component. The weave-gitops dashboard can be used to understand the state of the cluster.
Instructions are provided to guide you through the process of deploying the demo environment, cutting a release for "podinfo," verifying the release automation, installing the component, viewing the Weave GitOps dashboard, accessing the deployed application, applying configuration changes, monitoring the application update, and cutting a new release with updated features.
To deploy the demo environment execute the following:
make run
Once the environment has been created, login to Gitea using the following credentials:
username: ocm-admin
password: password
Next navigate to: https://gitea.ocm.dev/software-provider/podinfo-component/releases and click "New Release".
Enter "v1.0.0" for both the tag name and release name, and then click "Publish Release".
Once the release is published, navigate to https://ci.ocm.dev/#/namespaces/tekton-pipelines/pipelineruns and follow the progress of the release automation.
When the release pipeline has been completed we can install the component. Navigate to https://gitea.ocm.dev/software-consumer/ocm-applications/pulls/1 and merge the pull request.
With a minute or so Flux will reconcile the Weave GitOps component and the dashboard will be accessible at https://weave-gitops.ocm.dev. You can login with username: admin and password password.
We can view the podinfo Helm release that's been deployed in the default namespace: https://weave-gitops.ocm.dev/helm_release/graph?clusterName=Default&name=podinfo&namespace=default
We can also view the running application at https://podinfo.ocm.dev
The application can be configured using the parameters exposed in values.yaml. Now that podinfo is deployed we can tweak a few parameters, navigate to
https://gitea.ocm.dev/software-consumer/ocm-applications/_edit/main/values.yaml
and add the following:
podinfo:
replicas: 2
message: "Hello Open Component Model!"
serviceAccountName: ocm-ops
weave-gitops:
serviceAccountName: ocm-ops
The changes will soon be reconciled by Flux and visible at https://podinfo.ocm.dev. Note how the pod id changes now that we have 2 replicas of our application running.
Let's jump back to the provider repository and cut another release. This release will contain a new feature that changes the image displayed by the podinfo application. Follow the same process as before to create a release, bumping the version to v1.1.0.
Once the release is published, navigate to https://ci.ocm.dev/#/namespaces/tekton-pipelines/pipelineruns and follow the progress of the release automation.
Jump back to https://weave-gitops.ocm.dev to view the rollout of the new release.
Finally, navigate to https://podinfo.ocm.dev which now displays the OCM logo in place of the cuttlefish and the updated application version of 6.3.6
By leveraging the capabilities of Gitea, Tekton, Flux, and the OCM controller, this demo showcases the seamless deployment of components and dependencies in a secure manner. The use of secure OCI registries and automated release pipelines ensures the integrity and reliability of the deployment process.
Users can easily set up the demo environment, cut releases, monitor release automation, view the Weave GitOps dashboard and observe the deployment and update of applications. We have presented a practical illustration of how OCM and Flux can be employed to facilitate the deployment and management of applications in air-gapped environments, offering a robust and efficient solution for secure software delivery.
Code contributions, feature requests, bug reports, and help requests are very welcome. Please refer to the Contributing Guide in the Community repository for more information on how to contribute to OCM.
OCM follows the CNCF Code of Conduct.
Copyright 2022-2023 SAP SE or an SAP affiliate company and Open Component Model contributors. Please see our LICENSE for copyright and license information. Detailed information including third-party components and their licensing/copyright information is available via the REUSE tool.
