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How to Replicate an S3 Bucket from One Account to Another

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Rohit Wadhwani
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3 min read

Amazon Simple Storage Service (S3) is a popular cloud storage service offered by Amazon Web Services (AWS). It provides developers with a scalable and reliable way to store and retrieve data. In some scenarios, you may need to replicate an S3 bucket from one AWS account to another, either for backup purposes or to facilitate collaboration between multiple accounts. In this article, we will explore the step-by-step process of replicating an S3 bucket from one AWS account to another, along with code examples.

Prerequisites:

To replicate an S3 bucket from one account to another, you will need the following:

  1. AWS CLI (Command Line Interface) installed and configured with both AWS accounts.

  2. Access credentials (Access Key ID and Secret Access Key) for both AWS accounts.

  3. Sufficient permissions in both AWS accounts to perform S3 bucket operations and cross-account access.

Step 1: Create a New S3 Bucket in the Destination Account:

In the destination AWS account, create a new S3 bucket to which you want to replicate the data. You can create the bucket using the AWS Management Console or programmatically using the AWS CLI or SDKs.

Step 2: Configure Cross-Account Access:

To replicate the S3 bucket, you need to grant access from the source account to the destination account. This involves creating an IAM role in the destination account and allowing the source account to assume that role.

  1. In the destination AWS account, navigate to the IAM (Identity and Access Management) console.

  2. Create a new IAM role with the necessary permissions for S3 bucket operations.

  3. Attach a policy that allows the source AWS account to assume this IAM role.

  4. Note down the Amazon Resource Name (ARN) of the IAM role.

Step 3: Enable Bucket Replication in the Source Account:

In the source AWS account, enable bucket replication to start replicating the data to the destination bucket.

  1. Open the AWS Management Console and navigate to the S3 service.

  2. Select the source bucket you want to replicate.

  3. In the bucket properties, find the "Replication" section and click on "Add rule".

  4. Configure the replication rule with the following details:

    • Destination bucket: Specify the ARN of the destination bucket created in the destination account.

    • IAM role: Enter the ARN of the IAM role created in the destination account.

    • Replication options: Choose the replication settings that suit your requirements.

  5. Save the replication rule.

Step 4: Verify and Monitor the Replication:

Once the replication is configured, AWS S3 will automatically start replicating the objects from the source bucket to the destination bucket. You can monitor the replication progress and verify that the data is being replicated successfully.

  1. Open the AWS Management Console and navigate to the S3 service in the destination account.

  2. Select the destination bucket and check the "Replication" tab.

  3. Monitor the replication status, replication progress, and any errors or warnings.

  4. Validate the replicated objects in the destination bucket to ensure data integrity.

Code Example (AWS CLI):

  1. Create a new S3 bucket in the destination account:
bashCopy codeaws s3api create-bucket --bucket destination-bucket-name --region us-east-1
  1. Configure Cross-Account Access:
bashCopy codeaws iam create-role --role-name replication-role --assume-role-policy-document file://trust-policy.json
aws iam put-role-policy --role-name replication-role --policy-name replication-policy --policy-document file://permission-policy.json
  1. Enable Bucket Replication in the Source Account:
bashCopy codeaws s3api put-bucket-replication --bucket
s3 batch operations