Installing Argo CD on Kubernetes: A Terraform and Helm Approach

Argo CD, a leading GitOps tool, is designed to keep Kubernetes clusters synchronized with a desired state defined in a Git repository. While a direct `helm install` command suffices for local testing, a recent article emphasizes the benefits of integrating Terraform for more robust and scalable deployments in shared environments. The guide outlines a comprehensive approach where Terraform manages the installation process, leveraging the Helm provider to deploy the official Argo CD chart. This method brings several key advantages, including the ability to version-control the entire installation, making all changes visible and auditable through `terraform plan` outputs. Furthermore, using Terraform allows for the easy reuse of the same Argo CD configuration across different Kubernetes clusters, promoting standardization and reducing configuration drift. It also enables CI/CD systems to apply configurations reliably without relying on a local `kubeconfig` file. The article details how to manage Helm values alongside other infrastructure definitions, providing a unified approach to infrastructure as code. The proposed Terraform module connects to an existing Kubernetes cluster, creates the necessary `argocd` namespace, and then installs Argo CD. It also covers optional configurations such as exposing Argo CD through ingress and passing custom Helm values via a generic map, which are then merged with base values for flexible customization. This ensures that while common settings are easily configurable, advanced options remain accessible directly through the Helm chart.