How to Automate Release Promotion Across AWS EKS Environments Using Argo CD and Kargo

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Platform teams using Argo CD for GitOps often still rely on manual steps to move releases between dev, staging, and production environments — a gap the open-source tool Kargo is designed to fill. Kargo watches artifact sources like AWS ECR, models each environment as a stage, and automates promotion by committing version changes directly to the GitOps repository, while Argo CD continues to reconcile clusters against Git state. The architecture recommends separate EKS clusters per environment — ideally in isolated AWS accounts — to prevent blast-radius failures from affecting multiple environments simultaneously. A shared services account hosts Argo CD and Kargo, with ECR storing images that are promoted by immutable digest rather than rebuilt per environment, ensuring byte-identical artifacts reach production. GitHub Actions workflows authenticate to AWS via OIDC federation using short-lived tokens instead of static credentials, reducing the risk of credential leaks in CI pipelines.

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