Application resourcesĪll of the applications resources such as deployments, ConfigMaps, routes, and services are located under the org-services directory. The directories are organized as follows. This example GitOps approach utilizes a directory structure that allows for re-use across environments while also providing flexibility for customization. The directory structure provides flexibility Finally, we will deploy the latest image to the cluster with continuous delivery using OpenShift GitOps. We will implement these pipeline stages using common tasks that are available with OpenShift Pipelines. In this demonstration, we will model a simplistic continuous integration pipeline that clones an application source code repository, builds an application container image, pushes the resulting container image to an enterprise container registry (Quay), and updates a deployment manifest located in Git. GitHub, OpenShift Pipelines, Red Hat Quay, Kustomize, and OpenShift GitOps are the tools used in this approach.įigure 1: An overview of high level GitOps architecture, listing the tools used. These namespaces mimic separate clusters from a conceptual perspective. To demonstrate the concepts, the different environments are represented as unique namespaces within a single cluster, not separate clusters. The diagram in Figure 1 illustrates the architecture of the GitOps approach. Use branches and merge requests to enable a testing, review, and approval workflow when propagating changes to various environments. We also recommend using a mainline development approach with a single branch representing the source of truth for all environments. This is accomplished using a single Git repository (monorepo) and organizing environments with a directory structure that supports flexibility and reuse. The primary goal of the GitOps approach is to simplify the deployment of application workloads across multiple environments. Basic knowledge of OpenShift Pipelines (Tekton).Basic knowledge of OpenShift GitOps (Argo CD) applications and application sets.The following prerequisites are required to replicate this demo: Promoting from lower to upper environments.Deploying an application to different environments.Automating continuous delivery with Red Hat OpenShift Pipelines and continuous deployment with OpenShift GitOps.In this article, we will demonstrate the following processes: Follow this semi-guided demo to set up an automated method to deploy your application to Red Hat OpenShift clusters using the GitOps approach. With a specific pattern, you will be able to deploy multiple applications to different environments once the app is committed to a Git repo. This article discusses how to use Red Hat OpenShift GitOps to automate application deployment.
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