Atlantis at Scale: How It Works and Where It Breaks

Atlantis is an open-source CNCF sandbox project that automates Terraform plans and applies through Git pull requests, using webhooks, local working directories, locks, and PR comments to keep infrastructure changes in familiar developer workflows. Its simple single-server design is easy to adopt but can become constrained at scale as concurrent clones, provider downloads, plans, and applies compete for the same compute, disk, and network resources, while local plan storage, limited access controls, broad credential exposure, sparse audit history, absent cross-project dependency management, and an alpha drift-detection API create additional operational challenges. Organizations can extend Atlantis with larger instances, tuned concurrency, centralized repository configuration, persistent plugin caching, Redis-based distributed locking, S3-compatible external plan storage, stricter autoplan rules, and separate deployments for security boundaries, but these measures add infrastructure and maintenance responsibilities. The piece presents Spacelift as a managed alternative offering pull-request workflows alongside built-in policy controls, drift detection, dependency graphs, RBAC, scoped credentials, audit trails, worker pools, and self-service capabilities, and recommends gradual migration by mapping Atlantis projects to stacks, transferring state and credentials, translating approval rules into policies, and operating both systems in parallel before retiring Atlantis.

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