aws-s3-bucket-terraform

AWS S3 Bucket Creation and Management with Terraform.

Day 67 of #90DaysOfDevOps

AWS S3 Bucket

Amazon S3 (Simple Storage Service) is an object storage service that offers industry-leading scalability, data availability, security, and performance. It can be used for a variety of use cases, such as storing and retrieving data, hosting static websites, and more.

In this task, we will learn how to create and manage S3 buckets in AWS using Terraform.

Task

• Create an S3 bucket using Terraform.

• Configure the bucket to allow public read access.

• Create an S3 bucket policy that allows read-only access to a specific IAM user or role.

• Enable versioning on the S3 bucket.

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Enter the terraform and provider block:

terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 4.16"
    }
  }
  required_version = ">= 1.2.0"
}

provider "aws" {
  region = var.awsRegion
}

1: Create an S3 bucket using Terraform.

resource "aws_s3_bucket" "myBucket" {
  bucket = "day67-bucket"
  tags = {
    Name = "Day 67 Bucket"
  }
}

Here, resource block aws_s3_bucket will create s3 bucket with the name from bucket

So, a S3 bucket with the name day67-bucket will be created.

2: Configure the bucket to allow public read access.

resource "aws_s3_bucket_ownership_controls" "myBucket" {
  bucket = aws_s3_bucket.myBucket.id
  rule {
    object_ownership = "BucketOwnerPreferred"
  }
}

resource "aws_s3_bucket_public_access_block" "myBucket" {
  bucket                  = aws_s3_bucket.myBucket.id
  block_public_acls       = false
  block_public_policy     = false
  ignore_public_acls      = false
  restrict_public_buckets = false
}

resource "aws_s3_bucket_acl" "myBucket" {
  bucket     = aws_s3_bucket.myBucket.id
  acl        = "public-read"
  depends_on = [aws_s3_bucket_ownership_controls.myBucket, aws_s3_bucket_public_access_block.myBucket]
}

To set the ownership, the aws_s3_bucket_ownership_controls block is used and in the rule block the ownership is defined as bucketownerpreferred

As I don’t want to provide many permissions, it has been controlled by the aws_s3_bucket_public_access_block block.

In the aws_s3_bucket_acl block, the acl public-read will grant the access of publicly readable access to the bucket (myBucket). This block will get the required data from the aws_s3_bucket_ownership_controls and aws_s3_bucket_public_access_block block, and hence, it is defined in the depends_on attribute.

3: Create an S3 bucket policy that allows read-only access to a specific IAM user or role.

resource "aws_s3_bucket_policy" "Allow_access_from_another_account" {
  bucket = aws_s3_bucket.myBucket.id
  policy = data.aws_iam_policy_document.allow_access_from_another_account.
}

aws_s3_bucket_policy block used for attaching policy to the bucket. The policy is defined in the next data block:

data "aws_iam_policy_document" "allow_access_from_another_account" {
  statement {
    principals {
      type        = "AWS"
      identifiers = [680579562058]
    }
    actions = [
      "s3:GetObject",
      "s3:ListBucket",
    ]
    resources = [
      aws_s3_bucket.myBucket.arn,
      "${aws_s3_bucket.myBucket.arn}/*",
    ]
  }
}

In aws_iam_policy_document data block, the policy is defined for granting the access of certain policies (actions) to the user(identifier)

4: Enable versioning on the S3 bucket

resource "aws_s3_bucket_versioning" "myBucket_versioning" {
  bucket = aws_s3_bucket.myBucket.id
  versioning_configuration {
    status = "Enabled"
  }
}

In this block the versioning_configuration status is used to enable and disable the versioning of the s3 bucket.

After writing this code, init the terraform with terraform init and then apply.

AWS Console S3 bucket:

Bucket Versioning = Enabled

Public access:

Bucket Policy

Ownership:

Access Control List:

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Thank you for reading!

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