dms certficate issue

Question

ssl_mode="verify-ca",
            certificate_arn=

dms task needs ssl to be used
i am using above in cdk code

i have downlaoded its pem but dont want to commit in cdk repo physically
so want to upload it in ssm/secrets

# RDS CA certificate bundle - region-specific
def get_rds_ca_bundle():
    """Download region-specific RDS CA certificate bundle if not present"""
    # Get current region from Lambda environment
    region = os.environ.get('AWS_REGION', 'us-east-1')

bundle_path = f'/tmp/rds-ca-{region}.pem'
    bundle_url = f'https://truststore.pki.rds.amazonaws.com/{region}/{region}-bundle.pem'

if not os.path.exists(bundle_path):
        try:
            print(f"Downloading RDS CA bundle for {region} from {bundle_url}")
            urllib.request.urlretrieve(bundle_url, bundle_path)
            print(f"RDS CA bundle downloaded to {bundle_path}")
        except Exception as e:
            print(f"Error downloading region-specific bundle: {e}")
            # Try global bundle as fallback
            try:
                global_url = 'https://truststore.pki.rds.amazonaws.com/global/global-bundle.pem'
                print(f"Trying global bundle from {global_url}")
                urllib.request.urlretrieve(global_url, bundle_path)
                print(f"Global RDS CA bundle downloaded to {bundle_path}")
            except Exception as e2:
                print(f"Error downloading global bundle: {e2}")
                return None

return bundle_path

will this lambda work and if gets stored in secerts/ssm how to use in dms task

re:Post Agent · Answer

To use SSL with AWS Database Migration Service (DMS), you need to provide a certificate to establish a secure connection. Your approach of downloading the RDS CA certificate bundle and storing it in SSM or Secrets Manager is a good practice to avoid committing certificates to your code repository.

Your Lambda function for downloading the region-specific RDS CA certificate bundle looks correct. It attempts to download the region-specific bundle first, and if that fails, it falls back to the global bundle.

After downloading the certificate, you'll need to import it into AWS DMS using the `aws dms import-certificate` command. This can be done within your Lambda function after downloading the certificate:

```python
import boto3

# After downloading the certificate
with open(bundle_path, 'r') as cert_file:
cert_content = cert_file.read()

# Import certificate to DMS
dms_client = boto3.client('dms')
response = dms_client.import-certificate(
CertificateIdentifier='rds-ca-cert',
CertificatePem=cert_content
)

# Get the certificate ARN
certificate_arn = response['Certificate']['CertificateArn']

# Store the ARN in SSM Parameter Store or Secrets Manager
ssm_client = boto3.client('ssm')
ssm_client.put_parameter(
Name='/dms/certificate/arn',
Value=certificate_arn,
Type='String',
Overwrite=True
)
```

Then in your CDK code, you can retrieve the certificate ARN from SSM:

```typescript
// In your CDK code
const certificateArn = ssm.StringParameter.valueForStringParameter(
this, '/dms/certificate/arn'
);

// Use the certificate ARN in your DMS task
const dmsTask = new dms.CfnReplicationTask(this, 'DmsTask', {
// other properties
replicationTaskSettings: JSON.stringify({
// other settings
TargetMetadata: {
SslMode: 'verify-full',
CertificateArn: certificateArn
}
})
});
```

When configuring your DMS endpoint, you would reference this certificate ARN and set the SSL mode to "verify-full" to ensure secure connections. This approach allows you to use SSL with your DMS task without committing the certificate file to your repository.  
**Sources**  
[Using Amazon DocumentDB as a target for AWS Database Migration Service - AWS Database Migration Service](https://docs.aws.amazon.com/dms/latest/userguide/CHAP_Target.DocumentDB.html)  
[Using SSL with AWS Database Migration Service - AWS Database Migration Service](https://docs.aws.amazon.com/dms/latest/userguide/CHAP_Security.SSL.html)

dms certficate issue

RDS CA certificate bundle - region-specific

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