Sudhirs focus is on building common commerce features and services that power diverse VMware SaaS and hybrid, Using Distributed Tracing and RED Method to Map API Dependency and Monitor Reliability, Modern Infrastructure Refresh Preparing for Cross-Cloud Capabilities in your datacenter and the edge (Part 1 of 5), Owning Your Own Slice of Paradise with VMware Cross-Cloud Services, Replicating Encrypted S3 Objects Across AWS Accounts, Your VMware Cloud on Dell EMC Guide to Key VMworld 2021 Sessions, Why Every IT Admin Should Get Comfortable with Scripts and APIs, Creating VLAN-Backed Port Groups in Oracle Cloud VMware Solution, Oracle Cloud VMware Solution Networking Reference Architecture. At the end of this, the two buckets should be reported to you: There is a known deficiency in the AWS API when configuring S3 replication when SSE is in place: there is no way to specify the KMS key that is being used on the destination. The AWS S3 - Cross-region replication (CRR) allows you to replicate or copy your data in two different regions. Step 2: Create your Bucket Configuration File. All Rights Reserved. The same-account example needs a single profile with a high level of privilege to use IAM, KMS and S3. This assumes we have a bucket created called mybucket. There aren't additional SSE-C permissions beyond what are currently required for replication. To begin with, copy the terraform.tfvars.template to terraform.tfvars and provide the relevant information. How to Create Cross-Account User Roles for AWS with Terraform. Two AWS accounts: We need two AWS accounts with their account IDs. Required source_bucket_name - Name for the source bucket (which will be created by this module) source_region - Region for source bucket dest_bucket_name - Name for the destination bucket (optionally created by this module) This trust policy reduces the risks associated with privilege escalation. Cross-Account replication. . We are also adding a policy to grant the newly created role some permissions in the prod account. terraform-aws-s3-cross-account-replication, feat: make dest bucket policy sid unique (. AWS Terraform. I've been using S3 replication a bit lately for some cross-account backups. This means that there is no way to do this through Terraform either. It serves as one central place for users, S3 buckets, and other shared resources. While you could also just replicate your users across those other accounts, the simplest and cleanest way to access any resources there is to use AWS roles. To run this example you need to execute: $ terraform init $ terraform plan $ terraform apply A user can request access to a role, which will grant that user that roles temporary privileges. This video shows how configure AWS S3 Cross Region Replication using Terraform and CI/CD deployment via Github Actions. 1. User gets temporary credentials, export these as environment variables. https://docs.aws.amazon.com/AmazonS3/latest/dev/replication-config-for-kms-objects.html#replication-kms-cross-acct-scenario. 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For that to be secure, there needs to be a trust established between the account or user and the role. S3 service mustbe allowed permissionsto replicate objects from the source bucket to the destination bucket on your behalf. Create a policy. Licensed under the Apache License, Version 2.0 (the "License"); Overall, it's been working quite well however, I'd like to track that everything is being replicated correctly and I don't . Add cross region / cross account replication to an existing S3 Bucket. On the first step of the edit wizard, choose the correct KMS key from the pick list titled "Choose one or more keys for decrypting source objects"; Select the existing configuration on each of the next steps of the wizard. Data replication in S3 refers to the process of copying data from an S3 bucket of your choice to another bucket in an automatic manner, without affecting any other operation. Create an IAM role in Account A. With multiple AWS accounts, its practical to rely on a so-called bastion account for Identity and Access Management (IAM) users. Alternatively, you can set up rules to replicate objects between buckets in the same AWS Region by using Amazon S3 Same-Region Replication (SRR). I've also done some batch runs to cover pre-existing objects since replication only works with newly added data. AWS S3 Documentation mentions that the CMK owner must grant the source bucket owner permission to use the CMK. Roles enable users and AWS services to access other AWS accounts without having to create a user in those accounts first. In the following code, the user ("random") in trusted (dev) account assumes a role that has a permission for listing S3 bucket in trusting (prod) account. Of course this is a fairly simple example, but roles are also immensely useful for granting temporary access or allowing users to switch between different accounts and permission levels quickly. hbspt.cta._relativeUrls=true;hbspt.cta.load(2252258, 'f2efec44-be9d-48e5-9cdd-ac3183309c4f', {"useNewLoader":"true","region":"na1"}); How to Create Cross-Account User Roles for AWS with Terraform, best practices guide for multi-account setups here. terraform-aws-s3-cross-account-replication Terraform Module for managing s3 bucket cross-account cross-region replication. 2. This is all that needs to be done in code, but don't forget about the second requirement: the policy in the Source account to add to the replication role. This article discusses a method to configure replication for S3 objects from a bucket in one AWS account to a bucket in another AWS account, using server-side encryption using Key Management Service (KMS) and provides policy/terraform snippets. There was a problem preparing your codespace, please try again. These examples assume that you have command-line profiles with a high level of privilege to use IAM, KMS and S3. BogoToBogo Select the source bucket, and then select the. With that you should be good to terraform apply. Try out the role to access the S3 buckets in prod by following the steps in the documentation. In this post, we'll see how a user who has no access can have permission to AWS resource (here, S3) by assuming a role with Trust Relationship. Your options are to either do it manually after you deploy your bucket, or use local-exec to run AWS CLI to do it, or aws_lambda_invocation. With Amazon S3 Replication, you can set up rules to automatically replicate S3 objects across different AWS Regions by using Amazon S3 Cross-Region Replication (CRR). Lastly, the remote AWS account may then delegate access to its IAM users (or roles) by specifying the bucket name in a policy. This should definitely be described in the s3 bucket resource documentation on the Terraform site because it won't work . Please check complete example to see all other features supported by this module. Navigate to IAM console in the 'Data' account; 2. We can now login into our utils account, assume the role, and look at the prod S3 buckets. terraform { backend "s3" { bucket = "mybucket" key = "path/to/my/key" region = "us-east-1" } } Copy. There are many possible scenarios where setting up cross-region replication will prove helpful. What if the objects in the source bucket are encrypted? In the walkthrough above,I have shownhow to configure replication to copy objects across AWS accounts. To begin with , copy the terraform.tfvars.template to terraform.tfvars and provide the relevant information. 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Since were using the same Terraform for two AWS accounts, were defining a second provider, which is then used to make sure the next resources get created in the second account instead of the first. For information on what is . The tokens issued when a principal assumes an IAM role are temporary. Replicating delete markers between buckets. Now apply those Terraform files by running terraform init and then terraform apply. (How to use trust policies with IAM roles): In the following code, the user ("random") in trusted (dev) account assumes a role that has a permission for listing S3 bucket in trusting (prod) account. In this case, were only letting it list a few S3 buckets. Creating three architecture in AWS requires lot of resources like VPC, Subnets, Gateways, Routing tables etc to be created and this has been automated using terraform, for details go here. If it doesn't show up in the destination bucket quickly, you can check file in the console. Copyright 2018 Leap Beyond Emerging Technologies B.V. 3. If these topics excite you and you have a passion for building highly scalable, fault-tolerant, reliable SaaS services, join us in building foundational infrastructure components forCloud Services Engagement Platform. Requirements An existing S3 Bucket with versioning enabled Access to a different AWS account and/or region Architecture Source Bucket can be encrypted Versioning on Source Bucket will always be enabled (requirement for replication) Target Bucket will always be encrypted Terraform Module for managing s3 bucket cross-account cross-region replication. I have started with just provider declaration and one simple resource to create a bucket as shown below-. Their expiration reduces the risks associated with credentials leaking and being reused. 3. You can test by placing a new file in the bucket and seeing if it replicates. Create IAM policy allowing KMS keys to encrypt and decrypt, 3. Usually, data stored in S3 is replicated primarily for reliability, performance, and compliance reasons. An IAM role does not have long term credentials associated with it; rather, This might seem like doing the same thing twice, but youre actually establishing the trust from both sides by setting those two policies. 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Sudhir Kasanavesi is the Staff Engineer for the Cloud Services Engagement Platform team. As with the same-account case, we are caught by the deficiency in the AWS API, and need to do some manual steps on both the source and destination account. Navigate inside the bucket and create your bucket configuration file. Are you sure you want to create this branch? See the License for the specific language governing permissions and Buckets that are configured for ob. Build, The various how-to and walkthroughs around S3 bucket replication don't touch the case where server side encryption is in place, and there are some annnoyances around it. 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