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Scheduled EC2 Instance Type Modification using Lambda and CloudWatch Events
// Demonstration video can be found at:
// ModifyEC2InstanceType
const AWS = require('aws-sdk');
exports.handler = (event, context, callback) => {
const { instanceId, instanceRegion, instanceType } = event;
const ec2 = new AWS.EC2({ region: instanceRegion });
.then(() => ec2.stopInstances({ InstanceIds: [instanceId] }).promise())
.then(() => ec2.waitFor('instanceStopped', { InstanceIds: [instanceId] }).promise())
.then(() => ec2.modifyInstanceAttribute({InstanceId: instanceId, InstanceType: { Value: instanceType } }).promise())
.then(() => ec2.startInstances({ InstanceIds: [instanceId] }).promise())
.then(() => callback(null, `Successfully modified ${event.instanceId} to ${event.instanceType}`))
.catch(err => callback(err));
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