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Learn how to dramatically reduce Terraform pipeline execution times by implementing OverlayFS to solve concurrent caching limitations in this 15-minute conference talk from SREcon25 Europe/Middle East/Africa. Discover the challenges posed by Terraform's plugin cache system, which doesn't support concurrent initialization processes, forcing teams to choose between disabling caching entirely or serializing operations—both approaches that significantly slow down infrastructure automation pipelines. Explore how Cisco's engineering team leveraged OverlayFS, a specialized filesystem tool typically used in niche applications, to overcome these constraints and achieve a remarkable 90% reduction in plan execution times. Gain insights into optimizing Terraform workflows for large-scale infrastructure management where hundreds of plans must be executed within minutes, and understand how creative application of filesystem technologies can solve complex DevOps challenges.
