aws-cdk.aws-rds 1.16.3

CDK Constructs for AWS RDS

Amazon Relational Database Service Construct Library

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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.

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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:

# Example may have issues. See https://github.com/aws/jsii/issues/826
cluster = DatabaseCluster(self, "Database",
    engine=DatabaseClusterEngine.AURORA,
    master_user={
        "username": "admin"
    },
    instance_props={
        "instance_type": ec2.InstanceType.of(ec2.InstanceClass.BURSTABLE2, ec2.InstanceSize.SMALL),
        "vpc_subnets": {
            "subnet_type": ec2.SubnetType.PUBLIC
        },
        "vpc": 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:

# Example may have issues. See https://github.com/aws/jsii/issues/826
instance = DatabaseInstance(stack, "Instance",
    engine=rds.DatabaseInstanceEngine.ORACLE_SE1,
    instance_class=ec2.InstanceType.of(ec2.InstanceClass.BURSTABLE2, ec2.InstanceSize.SMALL),
    master_username="syscdk",
    vpc=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:

# Example may have issues. See https://github.com/aws/jsii/issues/826
DatabaseInstanceFromSnapshot(stack, "Instance",
    snapshot_identifier="my-snapshot",
    engine=rds.DatabaseInstanceEngine.POSTGRES,
    instance_class=ec2.InstanceType.of(ec2.InstanceClass.BURSTABLE2, ec2.InstanceSize.LARGE),
    vpc=vpc
)

DatabaseInstanceReadReplica(stack, "ReadReplica",
    source_database_instance=source_instance,
    engine=rds.DatabaseInstanceEngine.POSTGRES,
    instance_class=ec2.InstanceType.of(ec2.InstanceClass.BURSTABLE2, ec2.InstanceSize.LARGE),
    vpc=vpc
)

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

# Example may have issues. See https://github.com/aws/jsii/issues/826
# Set open cursors with parameter group
parameter_group = rds.ParameterGroup(self, "ParameterGroup",
    family="oracle-se1-11.2",
    parameters={
        "open_cursors": "2500"
    }
)

Add XMLDB and OEM with option group

# Example may have issues. See https://github.com/aws/jsii/issues/826
option_group = rds.OptionGroup(self, "OptionGroup",
    engine=rds.DatabaseInstanceEngine.ORACLE_SE1,
    major_engine_version="11.2",
    configurations=[{
        "name": "XMLDB"
    }, {
        "name": "OEM",
        "port": 1158,
        "vpc": vpc
    }
    ]
)

# Allow connections to OEM
option_group.option_connections.OEM.connections.allow_default_port_from_any_ipv4()

# Database instance with production values
instance = rds.DatabaseInstance(self, "Instance",
    engine=rds.DatabaseInstanceEngine.ORACLE_SE1,
    license_model=rds.LicenseModel.BRING_YOUR_OWN_LICENSE,
    instance_class=ec2.InstanceType.of(ec2.InstanceClass.BURSTABLE2, ec2.InstanceSize.MEDIUM),
    multi_az=True,
    storage_type=rds.StorageType.IO1,
    master_username="syscdk",
    vpc=vpc,
    database_name="ORCL",
    storage_encrypted=True,
    backup_retention=cdk.Duration.days(7),
    monitoring_interval=cdk.Duration.seconds(60),
    enable_performance_insights=True,
    cloudwatch_logs_exports=["trace", "audit", "alert", "listener"
    ],
    cloudwatch_logs_retention=logs.RetentionDays.ONE_MONTH,
    auto_minor_version_upgrade=False,
    option_group=option_group,
    parameter_group=parameter_group
)

# Allow connections on default port from any IPV4
instance.connections.allow_default_port_from_any_ipv4()

# Rotate the master user password every 30 days
instance.add_rotation_single_user("Rotation")

# Add alarm for high CPU
cloudwatch.Alarm(self, "HighCPU",
    metric=instance.metric_cPUUtilization(),
    threshold=90,
    evaluation_periods=1
)

# Trigger Lambda function on instance availability events
fn = lambda.Function(self, "Function",
    code=lambda.Code.from_inline("exports.handler = (event) => console.log(event);"),
    handler="index.handler",
    runtime=lambda.Runtime.NODEJS_8_10
)

availability_rule = instance.on_event("Availability", target=targets.LambdaFunction(fn))
availability_rule.add_event_pattern(
    detail={
        "EventCategories": ["availability"
        ]
    }
)

Instance events

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

# Example may have issues. See https://github.com/aws/jsii/issues/826
rule = instance.on_event("InstanceEvent", target=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:

# Example may have issues. See https://github.com/aws/jsii/issues/826
cluster.connections.allow_from_any_ipv4("Open to the world")

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

# Example may have issues. See https://github.com/aws/jsii/issues/826
write_address = cluster.cluster_endpoint.socket_address

For an instance database:

# Example may have issues. See https://github.com/aws/jsii/issues/826
address = instance.instance_endpoint.socket_address

Rotating master password

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

# Example may have issues. See https://github.com/aws/jsii/issues/826
cluster = rds.DatabaseCluster(stack, "Database",
    engine=rds.DatabaseClusterEngine.AURORA,
    master_user={
        "username": "admin"
    },
    instance_props={
        "instance_type": ec2.InstanceType.of(ec2.InstanceClass.BURSTABLE2, ec2.InstanceSize.SMALL),
        "vpc": vpc
    }
)

cluster.add_rotation_single_user("Rotation")

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

# Example may have issues. See https://github.com/aws/jsii/issues/826
SecretRotation(stack, "Rotation",
    secret=imported_secret,
    application=SecretRotationApplication.ORACLE_ROTATION_SINGLE_USER,
    target=imported_cluster, # or importedInstance
    vpc=imported_vpc
)

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):

# Example may have issues. See https://github.com/aws/jsii/issues/826
# The number of database connections in use (average over 5 minutes)
db_connections = instance.metric_database_connections()

# The average amount of time taken per disk I/O operation (average over 1 minute)
read_latency = instance.metric("ReadLatency", statistic="Average", period_sec=60)