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June 14, 2026

Terraform Apply Timeouts: IAM Role Batching at Scale

22 minutes

When terraform apply times out creating 100+ IAM roles, the culprit is usually AWS API throttling combined with Terraform's default parallelism — here's how to fix it.

You'll learn:

Why the default parallelism=10 isn't always safe and when raising it to -parallelism=50 helps vs. hurts

How AWS IAM's eventual-consistency model causes race conditions during bulk role creation

Batching strategies: splitting large role sets across multiple terraform apply runs or using for_each with targeted applies

Reading AWS API throttle errors in Terraform debug output (TF_LOG=DEBUG) to confirm the real bottleneck

Exponential backoff and retry tuning via the AWS provider's max_retries setting

Keywords: terraform apply timeout, AWS IAM role throttling, terraform parallelism, terraform at scale, IAM API rate limits

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