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cdk-sqlserver-seeder Mentioned in Awesome CDK

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A simple CDK seeder for SQL Server RDS databases.

When you create an RDS SQL Server instance using CloudFormation template, there is no way to provide initial schema definition as part of CloudFormation stack deployment. Custom schema deployment scripts can be executed only after the database deployment is complete.

cdk-sqlserver-seeder library is a AWS CDK construct that provides a way to automate this process and eliminate manual steps involved in the process of preparing new RDS SQL Server environment by executing custom SQL scripts on RDS SQL Server instance creation/deletion.

The construct relies on Invoke-SqlCmd cmdlet to run the scripts and provides a way to handle transient errors during stack provisioning.

Usage

import * as cdk from '@aws-cdk/core';
import * as ec2 from '@aws-cdk/aws-ec2';
import * as rds from '@aws-cdk/aws-rds';
import { SqlServerSeeder } from 'cdk-sqlserver-seeder';

export class DatabaseStack extends cdk.Stack {
    constructor(scope: cdk.Construct, id: string, props?: cdk.StackProps) {
        super(scope, id, props);

        const sqlServer = new rds.DatabaseInstance(this, 'Instance', {
            engine: rds.DatabaseInstanceEngine.SQL_SERVER_WEB,
            // all other properties removed for clarity
        });

        const seeder = new SqlServerSeeder(this, "SqlSeeder", { 
            database: sqlServer,
            port: 1433,
            vpc: vpc,
            createScriptPath: "./SQL/v1.0.0.sql", // script to be executed on resource creation
            deleteScriptPath: "./SQL/cleanup.sql" // script to be executed on resource deletion
        });
    }
}

Configuration properties

SqlServerSeeder construct accepts the following configuration properties:

ParameterRequiredDefaultDescription
vpcyesVPC for Lambda function deployment
databaseyesRDS SQL Server database instance
createScriptPathyesSQL scripts to run on resource creation
deleteScriptPathnoSQL script to run on resource deletion
portno1433RSD SQL Server database port
memorySizeno512Lambda function memory size
ignoreSqlErrorsnofalseWhether to ignore SQL error or not

Architecture

Architecture

cdk-sqlserver-seeder deploys a custom resource backed by PowerShell lambda to connect to SQL Server instance. Lambda function is deployed in private subnets of your VPC where RDS instance resides.

Lambda function retrieves database credentials from AWS Secrets Manager and uses them to construct connection string to the database.

SQL scripts are uploaded into S3 bucket during CDK application deployment. Lambda function downloads these scripts during execution.

Security considerations

Lambda function has the following permissions:

Acknowledgements

The whole project inspired by aws-cdk-dynamodb-seeder. I though it would be very helpful to have a similar way to seed initial schema to more traditional SQL Server databases.