use lambda to handle S3 cross region replication on AWS

implement S3 cross region replication with AWS lambda

Introduction

Amazon S3 is a widely used object storage service that provides durability, availability, and scalability. One of the most useful features of S3 is its ability to replicate data across multiple regions. However, setting up and managing cross-region replication can be a complex and time-consuming task. AWS Lambda can help automate this process by triggering replication events based on S3 object lifecycle events. In this blog post, we will discuss how to implement S3 cross-region replication with AWS Lambda.

Setting up S3 Cross-Region Replication

To set up S3 cross-region replication, you first need to create a replication rule that specifies the source bucket, destination bucket, and replication configuration. You can do this using the AWS Management Console or AWS Command Line Interface (CLI). Once you have created the replication rule, S3 will automatically replicate any new or updated objects in the source bucket to the destination bucket.

Triggering S3 Object Replication with AWS Lambda

AWS Lambda can be used to trigger S3 object replication by responding to S3 object lifecycle events. You can create a Lambda function that is triggered by S3 object creation or deletion events in the source bucket. The function can then copy the object to the destination bucket using the S3 API or AWS SDK.

To create a Lambda function, you first need to create an IAM role that grants the function permission to access S3 and any other AWS services that it requires. Next, you can create a new Lambda function using the AWS Management Console or AWS CLI. When creating the function, you can select the S3 trigger and specify the source bucket and event type.

copy when new object arrive

from __future__ import print_function
import json, time
import boto3
from boto3.s3.transfer import TransferConfig

print('Loading function')

def lambda_handler(event, context):
    key = event['Records'][0]['s3']['object']['key']
    source_bucket = "PUT-YOUR-SOURCE-BUCKET-HERE"
    target_bucket = "PUT-YOUR-DEST-BUCKET-HERE"
    config = TransferConfig(max_concurrency=20)
    s3 = boto3.client('s3')
    copy_source = {
        'Bucket': source_bucket,
        'Key': key
    }
    print("start delivering " + key + " from " + source_bucket)
    result = s3.copy(copy_source, target_bucket, key, Config=config)
    print(result)
    return 0

delete target object when source object removed

from __future__ import print_function

import json
import urllib
import boto3

print('Loading function')

s3 = boto3.client('s3')


def lambda_handler(event, context):

    # Get the object from the event and show its content type
    key = event['Records'][0]['s3']['object']['key']

    target_bucket = "PUT-YOUR-DEST-BUCKET-HERE"

    s3 = boto3.client('s3')
    result = s3.delete_object(Bucket=target_bucket, Key=key)
    print("deleting " + key + " from " + target_bucket)
    print(result)
    return 0

AI generated code

import boto3
import os

s3 = boto3.resource('s3')
dest_bucket_name = 'destination-bucket-name'
dest_region = 'destination-region'

def lambda_handler(event, context):
    source_bucket_name = event['Records'][0]['s3']['bucket']['name']
    key = event['Records'][0]['s3']['object']['key']

    try:
        copy_source = {
            'Bucket': source_bucket_name,
            'Key': key
        }

        dest_bucket = s3.Bucket(dest_bucket_name)
        dest_bucket.copy(copy_source, key, ExtraArgs={'ACL': 'public-read'})

        print('Copied object from {} to {}'.format(source_bucket_name, dest_bucket_name))
    except Exception as e:
        print(e)
        raise e

Monitoring S3 Cross-Region Replication with AWS CloudWatch

AWS CloudWatch can be used to monitor S3 cross-region replication and alert you to any errors or delays. You can create CloudWatch alarms that are triggered when replication metrics fall outside of predefined thresholds. This can help you quickly identify and resolve any issues with replication.

To monitor S3 cross-region replication with CloudWatch, you first need to enable replication metrics for the replication rule. You can do this using the AWS Management Console or AWS CLI. Once replication metrics are enabled, you can create CloudWatch alarms that are triggered by replication lag, replication status, or other replication-related metrics.

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