Quick and easy script to create an S3 bucket and dynamodb for the Terraform S3 backend. Run the script without parameters to create everything (e.g. ./init-terraform-backend.sh) or call each function individually if you want to do step-by-step (e.g ./init-terraform-backend create_terraform_s3_bucket).

init-terraform-backend.sh

#!/bin/bash

# Edit these variables:
# Make sure that the PROJECT is something unique,
# since the s3 bucket name needs to be globally unique
export PROJECT="YOUR_PROJECT"
export AWS_REGION="YOUR_REGION"
export BUCKET="${PROJECT}-terraform-state-files"
export LOCK_TABLE="${PROJECT}-terraform-locks"

create_terraform_s3_bucket() {
  aws s3api create-bucket \
  	--region "${AWS_REGION}" \
  	--bucket "${BUCKET}" \
  	--create-bucket-configuration LocationConstraint="${AWS_REGION}"

  aws s3api put-bucket-versioning \
    --bucket "${BUCKET}" \
    --versioning-configuration MFADelete=Disabled,Status=Enabled

  aws s3api put-bucket-encryption \
  	--region "${AWS_REGION}" \
  	--bucket "${BUCKET}" \
  	--server-side-encryption-configuration \
  	'{"Rules": [{"BucketKeyEnabled": true}]}'
}

create_terraform_dynamodb_locks_table() {
  aws dynamodb create-table \
  	--region "${AWS_REGION}" \
  	--table-name "${LOCK_TABLE}" \
  	--attribute-definitions AttributeName=LockID,AttributeType=S \
  	--key-schema AttributeName=LockID,KeyType=HASH \
  	--billing-mode PAY_PER_REQUEST
}

create_terraform_backend_tf() {
  cat > backend.tf <<EOF
terraform {
  backend "s3" {
    bucket         = "${BUCKET}"
    key            = "${PROJECT}.tfstate"
    region         = "${AWS_REGION}"
    dynamodb_table = "${LOCK_TABLE}"
  }
}
EOF
}

create_terraform_provider_tf() {
  cat > provider.tf <<EOF
provider "aws" {
  region  = "${AWS_REGION}"
}
EOF
}

# Check if a function name is provided as a command line argument
if [ $# -eq 1 ]; then
  case "$1" in
    create_terraform_s3_bucket)
      create_terraform_s3_bucket
      ;;
    create_terraform_dynamodb_locks_table)
      create_terraform_dynamodb_locks_table
      ;;
    create_terraform_backend_tf)
      create_terraform_backend_tf
      ;;
    create_terraform_provider_tf)
      create_terraform_provider_tf
      ;;
    *)
      echo "Invalid function name provided"
      ;;
  esac
else
  create_terraform_s3_bucket
  create_terraform_dynamodb_locks_table
  create_terraform_backend_tf
  create_terraform_provider_tf
fi