Welcome to Day 44 of 100 Days of DevOps, Focus for today is S3 Cross Region Replication
What is Cross-Region Replication
Cross-region replication (CRR) enables automatic, asynchronous copying of objects across buckets in different AWS Regions. Buckets configured for cross-region replication can be owned by the same AWS account or by different accounts.
Features and Limitations
- It only replicates the object at the point of enabling replication, all the object before that can’t be replicated.
- Cross region replication by default only replicates un-encrypted objects or objects which encrypted using SSE-S3(Server-Side Encryption with Amazon S3-Managed Keys)
- SSE-C(Server-Side Encryption with Customer-Provided Keys) are not supported and SSE-KMS requires some extra configuration.
- By default ownership and ACL are replicated and maintained but we can always customize it.
- The storage class is maintained by default.
- Lifecycle events are not replicated
- When the bucket owner has no permissions, objects are not replicated.
- Cross region replication is uni-directional i.e from source to destination, not the other way i.e if I delete the file at the destination it will not be deleted at Source.
Create a source and destination bucket in two different regions under the same account
- Versioning must be enabled in both the bucket to configure Cross Region Replication
- Any object that resides in the bucket before versioning is enabled will not be replicated
Step1: Create Source Bucket
Go to AWS Console --> https://console.aws.amazon.com/s3 --> Create bucket
* Give your bucket some name
* Choose Region as US East(N. Virginia)
- Once the bucket is created
Step2: Enable versioning
Click on the bucket --> Properties --> Versioning --> Enable versioning
Step3: Create a destination bucket
* Everything will be same, except Bucket name will be my-destination-s3-bucket-to-test-crr
* Region: US West(Oregon)
* Enabled Versioning
Step4: Enabled Cross Region Replication
* Go to your Source Bucket --> Management --> Replication --> Get started
* Select Entire bucket
* Select the destination Bucket
* Select new IAM role
* Give your Role name
* Review your settings and save it
Step5 : Test
- Go back to your Source S3 bucket(my-source-s3-bucket-to-test-crr) and try to upload some files
- Wait for a few mins, you will see the same file replicated to the destination bucket
- Terraform code to automate the above setup
- The above example shows how to perform cross region replication between the same account but what would be the case if both source and the destination account is different, in that case, you need to add a bucket policy
- Add the following bucket policy on the
destinationbucket to allow the owner of the
sourcebucket to replicate objects. Be sure to edit the policy by providing the AWS account ID of the
sourcebucket owner and the
Example 2: Configure CRR When Source and Destination Buckets Are Owned by Different AWS Accounts …
Example of configuring Amazon S3 cross-region replication (CRR) when source and destination buckets are owned by a…
- Few more things you can change on the destination end
- To replicate your data into a specific storage class in the destination bucket, select Change the storage class for the replicated object(s). Then choose the storage class that you want to use for the replicated objects in the destination bucket. If you don’t select this option, the storage class for replicated objects is the same class as the original objects.
- To change the object ownership of the replica objects to the destination bucket owner, select Change object ownership to destination owner. This option enables you to separate object ownership of the replicated data from the source. If asked, type the account ID of the destination bucket.
- When you select this option, regardless of who owns the source bucket or the source object, the AWS account that owns the destination bucket is granted full permission to replica objects.
How Do I Add a Cross-Region Replication (CRR) Rule to an S3 Bucket? - Amazon Simple Storage Service
How to create a cross-region replication rule for an S3 bucket.
- GitHub Link
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