Argo Rollouts vs Terraform

Argo Rollouts is a self-hosted Kubernetes controller for managing how application updates reach users. It supports BlueGreen, Canary and Rolling Update strategies, with weighted traffic shifting through ingress controllers or service meshes. Without a traffic-routing provider, it can adjust ReplicaSet counts instead. Metric integrations let it assess KPIs and automate promotion or rollback, while leaving room for manual judgment. Supported providers include NGINX, AWS ALB, Istio and Traefik for traffic, and Prometheus, Datadog, New Relic, Graphite and InfluxDB for metrics. It can operate independently of Argo CD and respond to Kubernetes manifest changes whether they come from GitOps or traditional CI/CD. Each cluster running Rollout workloads needs its own controller and CRD; a Rollout specification covers one application, not dependencies among applications. Shared-resource or worker-queue applications may be a poor fit, and infrastructure applications are not recommended. Argo Rollouts is free and open source. It runs on Linux, macOS, Windows or self-hosted environments.

Terraform is an infrastructure-as-code tool for defining, provisioning, and managing cloud and on-premises resources through human-readable configuration files. Its core process is to write a configuration, review an execution plan, then apply approved changes. Providers connect Terraform to services through APIs, and the Terraform Registry lists providers for AWS, Azure, Google Cloud, Kubernetes, GitHub, and Splunk. Modules package reusable infrastructure configurations that users can find or publish in the Registry. The free Community Edition is a downloadable command-line tool. HCP Terraform adds remote execution, repository connections to GitHub, GitLab, and Bitbucket that can trigger plans after changes, and an API. It stores state remotely with encryption at rest and offers workspaces, single sign-on, and role-based access controls. HCP Terraform and Terraform Enterprise support Sentinel policies. HashiCorp cautions that policy-as-code is a guardrail, not a security boundary, and trusted providers and modules matter because they can access workspace variables and state. Downloads are available for Windows, macOS, and Linux.