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feat(rds): support rolling instance updates to reduce downtime (aws#2…
…0054) Support defining the instance update behaviour of RDS instances. This allows to switch between bulk (all instances at once) and rolling updates (one instance after another). While bulk updates are faster, they have a higher risk for longer downtimes as all instances might be simultaneously unreachable due to the update. Rolling updates take longer but ensure that all but one instance are not updated and thus downtimes are limited to the (at most two) changes of the primary instance. We keep the current behaviour, namely a bulk update, as default. This implementation follows proposal A by @hixi-hyi in issue aws#10595. Fixes aws#10595
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packages/@aws-cdk/aws-rds/test/integ.rolling-instance-updates.ts
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import * as ec2 from '@aws-cdk/aws-ec2'; | ||
import * as cdk from '@aws-cdk/core'; | ||
import * as integTests from '@aws-cdk/integ-tests'; | ||
import * as constructs from 'constructs'; | ||
import * as rds from '../lib'; | ||
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interface RollingInstanceUpdateTestStackProps extends cdk.StackProps { | ||
instanceUpdateBehaviour: rds.InstanceUpdateBehaviour; | ||
} | ||
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class RollingInstanceUpdateTestStack extends cdk.Stack { | ||
constructor(scope: constructs.Construct, id: string, props: RollingInstanceUpdateTestStackProps) { | ||
super(scope, id, props); | ||
const vpc = new ec2.Vpc(this, 'Vpc', { | ||
maxAzs: 2, | ||
}); | ||
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new rds.DatabaseCluster(this, 'DatabaseCluster', { | ||
engine: rds.DatabaseClusterEngine.AURORA, | ||
instances: 3, | ||
instanceProps: { | ||
instanceType: ec2.InstanceType.of(ec2.InstanceClass.BURSTABLE3, ec2.InstanceSize.SMALL), | ||
vpc, | ||
}, | ||
removalPolicy: cdk.RemovalPolicy.DESTROY, | ||
instanceUpdateBehaviour: props.instanceUpdateBehaviour, | ||
}); | ||
} | ||
} | ||
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// Beginning of the test suite | ||
const app = new cdk.App(); | ||
new integTests.IntegTest(app, 'InstanceUpdateBehaviorTests', { | ||
testCases: [ | ||
new RollingInstanceUpdateTestStack(app, 'BulkUpdate', { | ||
instanceUpdateBehaviour: rds.InstanceUpdateBehaviour.BULK, | ||
}), | ||
new RollingInstanceUpdateTestStack(app, 'RollingUpdate', { | ||
instanceUpdateBehaviour: rds.InstanceUpdateBehaviour.ROLLING, | ||
}), | ||
], | ||
}); | ||
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app.synth(); |
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