Automating S3 Cross-Region Replication with Pulumi

Question

Pulumi · Accepted Answer

To automate S3 cross-region replication with Pulumi, you would typically define two S3 buckets: one for the source region and one for the destination region. Then, you would configure the replication policy on the source bucket to replicate objects to the destination bucket. Below is a Pulumi program that sets up cross-region replication between two AWS S3 buckets.

```typescript
import * as aws from "@pulumi/aws";

// Replace these with the appropriate AWS region identifiers for your use case
const sourceRegion = "us-west-1";
const destinationRegion = "us-east-1";

// Create an S3 bucket in the source region
const sourceBucket = new aws.s3.Bucket("sourceBucket", {
    region: sourceRegion,
    // Additional configuration here if needed
});

// Create an S3 bucket in the destination region
const destinationBucket = new aws.s3.Bucket("destinationBucket", {
    region: destinationRegion,
    // Additional configuration here if needed
});

// Create an IAM role for S3 bucket replication
const replicationRole = new aws.iam.Role("replicationRole", {
    assumeRolePolicy: JSON.stringify({
        Version: "2012-10-17",
        Statement: [{
            Action: "sts:AssumeRole",
            Effect: "Allow",
            Principal: {
                Service: "s3.amazonaws.com",
            },
        }],
    }),
});

// Attach the S3 replication policy to the role
new aws.iam.RolePolicy("replicationRolePolicy", {
    role: replicationRole.id,
    policy: sourceBucket.arn.apply(sourceBucketArn => JSON.stringify({
        Version: "2012-10-17",
        Statement: [{
            Action: [
                "s3:GetReplicationConfiguration",
                "s3:ListBucket",
            ],
            Effect: "Allow",
            Resource: [
                sourceBucketArn,
            ],
        }, {
            Action: [
                "s3:GetObjectVersion",
                "s3:GetObjectVersionAcl",
                "s3:GetObjectVersionTagging",
            ],
            Effect: "Allow",
            Resource: [
                `${sourceBucketArn}/*`,
            ],
        }, {
            Action: [
                "s3:ReplicateObject",
                "s3:ReplicateDelete",
                "s3:ReplicateTags",
                "s3:GetObjectVersionForReplication",
            ],
            Effect: "Allow",
            Resource: [
                `${destinationBucket.arn}/*`,
            ],
        }],
    })),
});

// Enable versioning on both the source and destination buckets
const sourceBucketVersioning = new aws.s3.BucketVersioning("sourceBucketVersioning", {
    bucket: sourceBucket.id,
    versioningConfiguration: {
        status: "Enabled",
    },
});

const destinationBucketVersioning = new aws.s3.BucketVersioning("destinationBucketVersioning", {
    bucket: destinationBucket.id,
    versioningConfiguration: {
        status: "Enabled",
    },
});

// Set up the replication configuration on the source bucket
new aws.s3.BucketReplicationConfiguration("replicationConfig", {
    bucket: sourceBucket.id,
    role: replicationRole.arn,
    rules: [{
        status: "Enabled",
        priority: 1,
        destination: {
            bucket: destinationBucket.arn,
            // You can specify a storage class here if needed
        },
        filter: {
            // You can specify a prefix or tags here if needed
        },
    }],
});

// Export the names and URLs of the buckets
export const sourceBucketName = sourceBucket.id;
export const destinationBucketName = destinationBucket.id;
export const sourceBucketEndpoint = sourceBucket.websiteEndpoint;
export const destinationBucketEndpoint = destinationBucket.websiteEndpoint;
```

This program sets up two S3 buckets in different regions, enables versioning on both, creates an IAM role with the necessary permissions for replication, and configures the replication policy on the source bucket. Replace the placeholder regions with your desired AWS regions. You can also add additional configuration to the buckets and replication rules as needed.