User guide

10 System.exit(-1);

}

// Create the AmazonEC2Client object so we can call various APIs.

AmazonEC2 ec2 = new AmazonEC2Client(credentials);

// Initializes a Spot Instance Request

RequestSpotInstancesRequest requestRequest = new RequestSpotInstances

Request();

// Request 1 x t1.micro instance with a bid price of $0.03.

20 requestRequest.setSpotPrice("0.03");

requestRequest.setInstanceCount(Integer.valueOf(1));

// Set up the specifications of the launch. This includes the instance

// type (e.g. t1.micro) and the latest Amazon Linux AMI id available.

25 // Note, you should always use the latest Amazon Linux AMI id or another

// of your choosing.

LaunchSpecification launchSpecification = new LaunchSpecification();

launchSpecification.setImageId("ami-8c1fece5");

launchSpecification.setInstanceType("t1.micro");

// Add the security group to the request.

ArrayList<String> securityGroups = new ArrayList<String>();

securityGroups.add("GettingStartedGroup");

launchSpecification.setSecurityGroups(securityGroups);

// Set up the placement group to use with whatever name you desire.

// For this demo we will just use "ADVANCED-DEMO-PLACEMENT-GROUP".

SpotPlacement placement = new SpotPlacement();

placement.setGroupName("ADVANCED-DEMO-PLACEMENT-GROUP");

40 launchSpecification.setPlacement(placement);

// Add the launch specification.

requestRequest.setLaunchSpecification(launchSpecification);

45 // Call the RequestSpotInstance API.

RequestSpotInstancesResult requestResult = ec2.requestSpotInstances(re

questRequest);

All of the parameters shown in this section are optional. It is also important to realize that most of these

parameters—with the exception of whether your bid is one-time or persistent—can reduce the likelihood

of bid fulfillment. So, it is important to leverage these options only if you need them. All of the preceding

code examples are combined into one long code sample, which can be found in the

com.amazonaws.codesamples.advanced.InlineGettingStartedCodeSampleApp.java class.

How to Persist a Root Partition After Interruption or

Termination

One of the easiest ways to manage interruption of your Spot instances is to ensure that your data is

checkpointed to an Amazon Elastic Block Store (Amazon EBS) volume on a regular cadence. By

checkpointing periodically, if there is an interruption you will lose only the data created since the last

checkpoint (assuming no other non-idempotent actions are performed in between).To make this process

easier, you can configure your Spot Request to ensure that your root partition will not be deleted on

Version v1.0.0

AWS SDK for Java Developer Guide

Tutorial: Advanced Amazon EC2 Spot Request

Management