# CDK RDS Scheduler Construct

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This is a CDK construct for creating a schedule to periodically start and stop RDS (Aurora) clusters or instances. 
It can be used to reduce billing outside of operational hours.

![Architecture](./image/architecture.png)

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## Usage

Install it via npm:

```bash
npm install cdk-rds-scheduler
```

Then use it in your CDK stack:

```typescript
import { RdsScheduler, Cron } from 'cdk-rds-scheduler';
import { TimeZone } from 'aws-cdk-lib/core';

// for DatabaseCluster
declare const databaseCluster: rds.DatabaseCluster;

new RdsScheduler(this, 'RdsClusterScheduler', {
  cluster: databaseCluster,
  schedule: [
    // Operate only during daytime on weekdays
    {
          start: new Cron({ minute: '0', hour: '8', day: '?', weekDay: 'MON-FRI' }),
          stop: new Cron({ minute: '0', hour: '18', day: '?', weekDay: 'MON-FRI' }),
      timeZone: TimeZone.ASIA_TOKYO,
    },
  ],
});

// for DatabaseInstance
declare const databaseInstance: rds.DatabaseInstance;

new RdsScheduler(this, 'RdsInstanceScheduler', {
  instance: databaseInstance,
  schedule: [
    // Put the instance into a dormant state.
    // As a measure for automatic start of Aurora, stop it every day.
    {
      stop: new Cron({ minute: '0', hour: '0', day: '?', weekDay: '*' }),
      // timeZone is optional, default is UTC
    },
  ],
});
```