'How to run only delta changes in Terraform for new workspace
I'm using terraform in a CI/CD pipeline.
- When I open a pull request, I create a workspace named after the feature branch.
- Terraform creates all the resources with the workspace name attached to them so as to be unique.
- Once this is deployed to prod there is a cleanup step that destroys everything created by that workspace.
This works fine but recreating all the resources for every pull request soon will be unfeasible. Is there a way in Terraform to defer to the prod tfstate file so to plan only for the delta from this and their dependencies?
A simple example:
my prod tfstate has these resources
- 1 database(dbA)
- 2 schemas(dbA.schemaA,dbA.schemaB)
- 1 table (dbA.schemaA.tableA).
If I add one table(dbA.schemaB.tableB) in dbA.schemaB, I'd want terraform to plan for
- dbA
- dbA.schemaB
- dbA.schemaB.tableB
and not for
- dbA.schemaA
- dbA.schemaA.tableA
Sources
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Source: Stack Overflow
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