Terraform — Notes

Key takeaways, tips, and important points to remember

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Written by senior engineers. Reviewed for technical accuracy.· Updated 2025 · SynfraCore Terraform Team

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Terraform Key Notes

•Use tfenv for version switching: tfenv install 1.6.6, tfenv use 1.6.6

•Pin provider versions in versions.tf — prevents surprise breaking changes

•OpenTofu is the open-source fork (after HashiCorp BSL license change Aug 2023) — same syntax

1.Remote state is mandatory for teams — never local state in shared repos

2.State locking prevents concurrent applies

3.Never manually edit state file — use terraform state mv/rm

4.State contains secrets in plaintext — encrypt at rest (S3 server-side encryption, Azure Blob encryption)

1.Write the HCL configuration for the resource

2.terraform import azurerm_resource_group.main /subscriptions/.../resourceGroups/my-rg

3.terraform plan — verify no unexpected changes

4.terraform apply if plan shows no changes

	Terraform	OpenTofu

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