Duplicate resource configuration / variable declaration Terraform Origin: Platform & cloud OSI layer 7 · Application Last updated 5 Nov 2026

Terraform: Error: Duplicate resource "aws_s3_bucket" configuration — A aws_s3_bucket resource named "logs" was already declared at main.tf:1

The same resource, variable, output or provider is declared twice in the module.

Exact message you may see Error: Duplicate resource "aws_s3_bucket" configurationA aws_s3_bucket resource named "logs" was already declared at main.tf:1Error: Duplicate variable declarationA variable named "region" was already declared at variables.tf:1,1-18Error: Duplicate provider configuration
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Seen on: Terraform

Meaning

Terraform loads every .tf file in the directory as one module. A copied file (main copy.tf, .tf.bak named .tf), duplicated blocks, or moving code between files without removing the original causes this. Rename/remove duplicates; keep backups outside the folder or with non-.tf extension.

Common causes

  • Backup/copy files ending in .tf
  • Same block in two files
  • Variable declared in variables.tf and main.tf
  • Duplicate provider without alias
  • Merge conflicts leaving both sides

⚡ Quick fix

  1. grep -R 'resource "aws_s3_bucket" "logs"' *.tf and remove the duplicate
  2. Move backups out of the directory
  3. Give providers aliases when using several configs

Detailed fix by platform

Linux

  1. ls *.tf && grep -n 'variable "region"' *.tf

How to diagnose

  1. Files — Which declare it?
  2. Backups — .tf copies?
  3. Alias — Needed?

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: Platform & cloud. Errors that are often confused with or caused by this one (click to open):

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