Using ArgoCD & Terraform to Manage Kubernetes Cluster

ArgoCD and Terraform are tools that can be used together to ensure a seamless process for deploying and managing infrastructure and applications. ArgoCD is a GitOps delivery tool for Kubernetes, while Terraform is an infrastructure-as-code (IaC) tool that works with many cloud providers, databases, VCS systems, and Kubernetes. Combining these tools offers several advantages, including declarative IaC and application management, GitOps workflow, and consistency in deployment across different environments. In this tutorial, we demonstrated how to manage a K8s cluster using ArgoCD and Terraform by creating an automation that covers the following steps: 1. Preparing Terraform code for EKS (Elastic Kubernetes Service) provisioning. 2. Deploying ArgoCD with Terraform. 3. Configuring remote state for Terraform. 4. Running the Terraform code to apply the changes. 5. Preparing Kubernetes manifests to deploy a sample nginx application. 6. Creating an ArgoCD application manifest. 7. Logging in to Argo and seeing the deployed application. We also showed how to leverage GitHub Actions to automate this deployment process, as well as Spacelift for managing both Terraform and Kubernetes resources lifecycle, enabling collaboration, and adding security controls to workflows.