Terraform Taint, Untaint, Replace – How to Use It (Examples)

In this post, we explore how the CLI commands – taint, untaint, and replace – help address issues with Terraform-managed cloud resources. We create two EC2 instances using Terraform and demonstrate how to use these commands to replace a misconfigured resource with a new instance. The taint command marks a resource as tainted so that it will be replaced in the next apply cycle, while the untaint command removes this mark if it was a mistake. Starting from Terraform version 0.15.2, the taint command is deprecated and it is suggested to use apply command with the -replace flag instead. This approach eliminates the time between marking the resource as tainted and applying those changes, thus avoiding unintentional replacements in a shared development environment.

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