Setting Up AWS DMS Service for Data Ingestion from On-Premises DB to AWS with CDC Approach
AWS Database Migration Service (DMS) is a fully managed service that makes it easy to migrate databases to AWS quickly, securely, and seamlessly.
In this blog post, I will guide you through the setup of AWS DMS service for data ingestion from on-premises databases to AWS using a Change Data Capture (CDC) approach.
What is Change Data Capture (CDC)?
Change Data Capture is a technique used to identify and capture data changes that have occurred in a database since the last replication process. CDC is a critical component in data migration, as it enables the efficient replication of changes in real-time, without having to transfer the entire database every time a change is made.
Example Scenario:
Let’s assume that you have a Microsoft SQL Server database running on an on-premises server, and you want to ingest the data to an Amazon S3 bucket in AWS using the CDC approach.
Setup Guide:
- Set up an Amazon S3 bucket: Before you can start ingesting data, you need to create an Amazon S3 bucket to serve as the target for your database ingestion.
Follow these steps to create an Amazon S3 bucket:
a. Log in to your AWS Management Console.
b. Navigate to the Amazon S3 console.
c. Click on the “Create Bucket” button.
d. Enter a unique bucket name, choose the region, and configure the bucket settings.
2. Set up an IAM role: To allow DMS to access your Amazon S3 bucket, you need to set up an IAM role with the necessary permissions.
Follow these steps to create an IAM role:
a. Navigate to the AWS Identity and Access Management (IAM) console.
b. Click on the “Roles” option in the sidebar.
c. Click on the “Create Role” button.
d. Select “DMS” as the service that will use this role.
e. Choose “DMS” as the use case for the role.
f. Select “AmazonS3FullAccess” as the policy.
3. Create a replication instance: The replication instance is a server that AWS DMS uses to ingest data from the source database to the target Amazon S3 bucket.
Follow these steps to create a replication instance:
a. Navigate to the AWS DMS console.
b. Click on the “Create replication instance” button.
c. Specify the replication instances settings, such as instance type, VPC, and security group.
d. Provide the username and password for your replication instance.
4. Create a source endpoint: The source endpoint is the on-premises database you want to ingest to AWS.
Follow these steps to create a source endpoint:
a. Navigate to the AWS DMS console.
b. Click on the “Create endpoint” button.
c. Select the database engine (in this case, Microsoft SQL Server) and provide the necessary connection details, such as hostname, port number, username, and password.
d. Test the connection to ensure that AWS DMS can connect to your on-premises database.
5. Create a target endpoint: The target endpoint is the Amazon S3 bucket you created earlier.
Follow these steps to create a target endpoint:
a. Navigate to the AWS DMS console.
b. Click on the “Create endpoint” button.
c. Select the Amazon S3 bucket as the target and provide the necessary connection details, such as the endpoint address, port number, username, and password.
d. Test the connection to ensure that AWS DMS can connect to your Amazon S3 bucket.
6. Create a replication task: The replication task is the process of ingesting data from the on-premises database to the Amazon S3 bucket using CDC.
Follow these steps to create a replication task:
a. Navigate to the AWS DMS console.
b. Click on the “Create task” button.
c. Specify the task settings, such as task name, source endpoint, target endpoint, replication instance, and CDC mode.
d. Configure the mapping rules to ensure that data is ingested into the correct location in the Amazon S3 bucket.
e. Start the replication task and monitor its progress in the AWS DMS console.
Disaster Recovery Mechanism:
In the event of a failure or interruption during the data ingestion process, AWS DMS provides a robust disaster recovery mechanism. AWS DMS automatically creates and maintains standby replication instances that can take over in the event of a failure of the primary replication instance. This ensures that your data ingestion process is always available and that any interruptions are quickly resolved.
Conclusion:
AWS DMS is a powerful service that simplifies the process of ingesting data from on-premises databases to AWS. Using a CDC approach ensures that only changed data is ingested, minimizing the time and resources required for the data ingestion process. By following the steps outlined in this blog post, you can easily set up AWS DMS for data ingestion from on-premises databases to AWS with CDC and ensure a robust disaster recovery mechanism is in place.