Amazon Relational Database Service Construct Library

---

This is a developer preview (public beta) module. Releases might lack important features and might have future breaking changes.

This API is still under active development and subject to non-backward compatible changes or removal in any future version. Use of the API is not recommended in production environments. Experimental APIs are not subject to the Semantic Versioning model.

---

Starting a Clustered Database

To set up a clustered database (like Aurora), define a DatabaseCluster. You must always launch a database in a VPC. Use the vpcSubnets attribute to control whether your instances will be launched privately or publicly:

const cluster = new DatabaseCluster(this, 'Database', {
    engine: DatabaseClusterEngine.AURORA,
    masterUser: {
        username: 'admin'
    },
    instanceProps: {
        instanceType: ec2.InstanceType.of(ec2.InstanceClass.BURSTABLE2, ec2.InstanceSize.SMALL),
        vpcSubnets: {
            subnetType: ec2.SubnetType.PUBLIC,
        },
        vpc
    }
});

By default, the master password will be generated and stored in AWS Secrets Manager.

Your cluster will be empty by default. To add a default database upon construction, specify the defaultDatabaseName attribute.

Starting an Instance Database

To set up a instance database, define a DatabaseInstance. You must always launch a database in a VPC. Use the vpcSubnets attribute to control whether your instances will be launched privately or publicly:

const instance = new DatabaseInstance(stack, 'Instance', {
    engine: rds.DatabaseInstanceEngine.ORACLE_SE1,
    instanceClass: ec2.InstanceType.of(ec2.InstanceClass.BURSTABLE2, ec2.InstanceSize.SMALL),
    masterUsername: 'syscdk',
    vpc
});

By default, the master password will be generated and stored in AWS Secrets Manager.

Use DatabaseInstanceFromSnapshot and DatabaseInstanceReadReplica to create an instance from snapshot or a source database respectively:

new DatabaseInstanceFromSnapshot(stack, 'Instance', {
    snapshotIdentifier: 'my-snapshot',
    engine: rds.DatabaseInstanceEngine.POSTGRES,
    instanceClass: ec2.InstanceType.of(ec2.InstanceClass.BURSTABLE2, ec2.InstanceSize.LARGE),
    vpc
});

new DatabaseInstanceReadReplica(stack, 'ReadReplica', {
    sourceDatabaseInstance: sourceInstance,
    engine: rds.DatabaseInstanceEngine.POSTGRES,
    instanceClass: ec2.InstanceType.of(ec2.InstanceClass.BURSTABLE2, ec2.InstanceSize.LARGE),
    vpc
});

Creating a "production" Oracle database instance with option and parameter groups:

example of setting up a production oracle instance

Instance events

To define Amazon CloudWatch event rules for database instances, use the onEvent method:

const rule = instance.onEvent('InstanceEvent', { target: new targets.LambdaFunction(fn) });

Connecting

To control who can access the cluster or instance, use the .connections attribute. RDS databases have a default port, so you don't need to specify the port:

cluster.connections.allowFromAnyIpv4('Open to the world');

The endpoints to access your database cluster will be available as the .clusterEndpoint and .readerEndpoint attributes:

const writeAddress = cluster.clusterEndpoint.socketAddress;   // "HOSTNAME:PORT"

For an instance database:

const address = instance.instanceEndpoint.socketAddress;   // "HOSTNAME:PORT"

Rotating master password

When the master password is generated and stored in AWS Secrets Manager, it can be rotated automatically:

example of setting up master password rotation for a cluster

Rotation of the master password is also supported for an existing cluster:

new SecretRotation(stack, 'Rotation', {
    secret: importedSecret,
    application: SecretRotationApplication.ORACLE_ROTATION_SINGLE_USER
    target: importedCluster, // or importedInstance
    vpc: importedVpc,
})

The importedSecret must be a JSON string with the following format:

{
  "engine": "<required: database engine>",
  "host": "<required: instance host name>",
  "username": "<required: username>",
  "password": "<required: password>",
  "dbname": "<optional: database name>",
  "port": "<optional: if not specified, default port will be used>"
}

Metrics

Database instances expose metrics (cloudwatch.Metric):

// The number of database connections in use (average over 5 minutes)
const dbConnections = instance.metricDatabaseConnections();

// The average amount of time taken per disk I/O operation (average over 1 minute)
const readLatency = instance.metric('ReadLatency', { statistic: 'Average', periodSec: 60 });