How to import existing resources in Terraform?

Question

Accepted Answer

**terraform import** — including existing resources in Terraform management.

```bash
# Import EC2
terraform import aws_instance.web i-1234567890abcdef0

# Import S3
terraform import aws_s3_bucket.mybucket my-bucket-name

# Import IAM user
terraform import aws_iam_user.admin alice
```

**After import, HCL code is needed:**
```hcl
resource "aws_instance" "web" {
  ami           = "ami-xxx"
  instance_type = "t3.micro"
}
terraform plan  # Should show "No changes"
```

**Import blocks (Terraform 1.5+):**
```hcl
import {
  to = aws_instance.web
  id = "i-1234567890abcdef0"
}

terraform plan -generate-config-out=generated.tf
```

**State commands:**
```bash
terraform state list
terraform state mv aws_instance.old aws_instance.new
terraform state rm aws_instance.web
```

DevOps: How to import existing resources in Terraform?