Table of Contents
The Error
Error: DependencyViolation: resource has a dependent object
What Causes This
You’re destroying a resource that other resources depend on. AWS won’t delete VPCs with subnets or SGs attached to ENIs.
How to Fix It
Solution 1: Destroy in Correct Order
terraform destroy -target=aws_instance.web
terraform destroy -target=aws_security_group.web
terraform destroy
Solution 2: Find Dependent Resources
aws ec2 describe-network-interfaces \
--filters "Name=group-id,Values=sg-xxx"
Solution 3: Use create_before_destroy
lifecycle {
create_before_destroy = true
}
Prevention Tips
- Pin provider versions — avoid surprise breaking changes
- Use CI/CD — catch errors before they hit production
- Test with
terraform plan— always review before applying - Keep Terraform updated — newer versions have better error messages
- Use
terraform validate— catches syntax errors early
Hands-On Courses
- Terraform for Beginners on CopyPasteLearn
- Terraform By Example — practical code examples
- Terraform Cheat Sheet — quick reference for all commands
Related Articles
- Terraform Troubleshooting - Common Errors and Solutions
- Terraform Enabling and Using Debugging
- Debugging with TFLint
Conclusion
This error is common and fixable. Follow the solutions above, and check our Terraform course for hands-on training that covers real-world troubleshooting scenarios.
