Tutorial de Amazon EC2 Spot Instance

Tiene una tarea de procesamiento por lotes que tardará en ejecutarse una cantidad determinada de horas o días. Sin embargo, es flexible con respecto a cuándo comienza y finaliza. Desea ver si puede completarla por menos del valor del costo de las instancias bajo demanda.

Para examinar el historial de precios al contado, por ejemplo, puede utilizar la EC2 consola de Amazon o Amazon EC2API. Una vez que haya analizado el historial de precios para su tipo de instancia deseado en una zona de disponibilidad especificada, tendrá dos enfoques alternativos para su solicitud:

Tiene una tarea de procesamiento de datos para ejecutar. Conoce las ventajas de los resultados de la tarea lo suficientemente bien como para saber lo valiosos que son en términos de costos de computación.

Una vez que analizado el historial de precios de instancias de spot del tipo de instancia, elige un precio en el que el costo del tiempo de computación no es superior al valor de los resultados de la tarea. Crea una solicitud persistente y deja que se ejecute intermitentemente a medida que el precio de instancia de spot fluctúa en torno a su solicitud o por debajo de esta.

Tiene una necesidad a corto plazo no anticipada de capacidad adicional que no está disponible a través de las instancias bajo demanda. Una vez analizado el historial de precios de instancia de spot del tipo de instancia, elige un precio por encima del precio histórico para mejorar significativamente la probabilidad de que la solicitud se atienda con rapidez y continúe computándose hasta completarse.

NuGet paquetes:

Elementos de programación:

using System;
using System.Threading;
using System.Threading.Tasks;
using System.Collections.Generic;
using Amazon.EC2;
using Amazon.EC2.Model;

namespace EC2SpotInstanceRequests
{
  class Program
  {
    static async Task Main(string[] args)
    {
      // Some default values.
      // These could be made into command-line arguments instead.
      var instanceType = InstanceType.T1Micro;
      string securityGroupName = "default";
      string spotPrice = "0.003";
      int instanceCount = 1;

      // Parse the command line arguments
      if((args.Length != 1) || (!args[0].StartsWith("ami-")))
      {
        Console.WriteLine("\nUsage: EC2SpotInstanceRequests ami");
        Console.WriteLine("  ami: the Amazon Machine Image to use for the Spot Instances.");
        return;
      }

      // Create the Amazon EC2 client.
      var ec2Client = new AmazonEC2Client();

      // Create the Spot Instance request and record its ID
      Console.WriteLine("\nCreating spot instance request...");
      var req = await CreateSpotInstanceRequest(
        ec2Client, args[0], securityGroupName, instanceType, spotPrice, instanceCount);
      string requestId = req.SpotInstanceRequestId;

      // Wait for an EC2 Spot Instance to become active
      Console.WriteLine(
        $"Waiting for Spot Instance request with ID {requestId} to become active...");
      int wait = 1;
      var start = DateTime.Now;
      while(true)
      {
        Console.Write(".");

        // Get and check the status to see if the request has been fulfilled.
        var requestInfo = await GetSpotInstanceRequestInfo(ec2Client, requestId);
        if(requestInfo.Status.Code == "fulfilled")
        {
          Console.WriteLine($"\nSpot Instance request {requestId} " +
            $"has been fulfilled by instance {requestInfo.InstanceId}.\n");
          break;
        }

        // Wait a bit and try again, longer each time (1, 2, 4, ...)
        Thread.Sleep(wait);
        wait = wait * 2;
      }

      // Show the user how long it took to fulfill the Spot Instance request.
      TimeSpan span = DateTime.Now.Subtract(start);
      Console.WriteLine($"That took {span.TotalMilliseconds} milliseconds");

      // Perform actions here as needed.
      // For this example, simply wait for the user to hit a key.
      // That gives them a chance to look at the EC2 console to see
      // the running instance if they want to.
      Console.WriteLine("Press any key to start the cleanup...");
      Console.ReadKey(true);

      // Cancel the request.
      // Do this first to make sure that the request can't be re-fulfilled
      // once the Spot Instance has been terminated.
      Console.WriteLine("Canceling Spot Instance request...");
      await CancelSpotInstanceRequest(ec2Client, requestId);

      // Terminate the Spot Instance that's running.
      Console.WriteLine("Terminating the running Spot Instance...");
      await TerminateSpotInstance(ec2Client, requestId);

      Console.WriteLine("Done. Press any key to exit...");
      Console.ReadKey(true);
    }


    //
    // Method to create a Spot Instance request
    private static async Task<SpotInstanceRequest> CreateSpotInstanceRequest(
      IAmazonEC2 ec2Client, string amiId, string securityGroupName,
      InstanceType instanceType, string spotPrice, int instanceCount)
    {
      var launchSpecification = new LaunchSpecification{
        ImageId = amiId,
        InstanceType = instanceType
      };
      launchSpecification.SecurityGroups.Add(securityGroupName);
      var request = new RequestSpotInstancesRequest{
        SpotPrice = spotPrice,
        InstanceCount = instanceCount,
        LaunchSpecification = launchSpecification
      };

      RequestSpotInstancesResponse result =
        await ec2Client.RequestSpotInstancesAsync(request);
      return result.SpotInstanceRequests[0];
    }


    //
    // Method to get information about a Spot Instance request, including the status,
    // instance ID, etc.
    // It gets the information for a specific request (as opposed to all requests).
    private static async Task<SpotInstanceRequest> GetSpotInstanceRequestInfo(
      IAmazonEC2 ec2Client, string requestId)
    {
      var describeRequest = new DescribeSpotInstanceRequestsRequest();
      describeRequest.SpotInstanceRequestIds.Add(requestId);

      DescribeSpotInstanceRequestsResponse describeResponse =
        await ec2Client.DescribeSpotInstanceRequestsAsync(describeRequest);
      return describeResponse.SpotInstanceRequests[0];
    }


    //
    // Method to cancel a Spot Instance request
    private static async Task CancelSpotInstanceRequest(
      IAmazonEC2 ec2Client, string requestId)
    {
      var cancelRequest = new CancelSpotInstanceRequestsRequest();
      cancelRequest.SpotInstanceRequestIds.Add(requestId);

      await ec2Client.CancelSpotInstanceRequestsAsync(cancelRequest);
    }


    //
    // Method to terminate a Spot Instance
    private static async Task TerminateSpotInstance(
      IAmazonEC2 ec2Client, string requestId)
    {
      var describeRequest = new DescribeSpotInstanceRequestsRequest();
      describeRequest.SpotInstanceRequestIds.Add(requestId);

      // Retrieve the Spot Instance request to check for running instances.
      DescribeSpotInstanceRequestsResponse describeResponse =
        await ec2Client.DescribeSpotInstanceRequestsAsync(describeRequest);

      // If there are any running instances, terminate them
      if(   (describeResponse.SpotInstanceRequests[0].Status.Code
              == "request-canceled-and-instance-running")
         || (describeResponse.SpotInstanceRequests[0].State == SpotInstanceState.Active))
      {
        TerminateInstancesResponse response =
          await ec2Client.TerminateInstancesAsync(new TerminateInstancesRequest{
            InstanceIds = new List<string>(){
              describeResponse.SpotInstanceRequests[0].InstanceId } });
        foreach (InstanceStateChange item in response.TerminatingInstances)
        {
          Console.WriteLine($"\n  Terminated instance: {item.InstanceId}");
          Console.WriteLine($"  Instance state: {item.CurrentState.Name}\n");
        }
      }
    }
  }
}

using System;
using System.Threading;
using System.Threading.Tasks;
using System.Collections.Generic;
using Amazon.EC2;
using Amazon.EC2.Model;

namespace EC2SpotInstanceRequests
{
  class Program
  {
    static async Task Main(string[] args)
    {
      // Some default values.
      // These could be made into command-line arguments instead.
      var instanceType = InstanceType.T1Micro;
      string securityGroupName = "default";
      string spotPrice = "0.003";
      int instanceCount = 1;

      // Parse the command line arguments
      if((args.Length != 1) || (!args[0].StartsWith("ami-")))
      {
        Console.WriteLine("\nUsage: EC2SpotInstanceRequests ami");
        Console.WriteLine("  ami: the Amazon Machine Image to use for the Spot Instances.");
        return;
      }

      // Create the Amazon EC2 client.
      var ec2Client = new AmazonEC2Client();

      // Create the Spot Instance request and record its ID
      Console.WriteLine("\nCreating spot instance request...");
      var req = await CreateSpotInstanceRequest(
        ec2Client, args[0], securityGroupName, instanceType, spotPrice, instanceCount);
      string requestId = req.SpotInstanceRequestId;

      // Wait for an EC2 Spot Instance to become active
      Console.WriteLine(
        $"Waiting for Spot Instance request with ID {requestId} to become active...");
      int wait = 1;
      var start = DateTime.Now;
      while(true)
      {
        Console.Write(".");

        // Get and check the status to see if the request has been fulfilled.
        var requestInfo = await GetSpotInstanceRequestInfo(ec2Client, requestId);
        if(requestInfo.Status.Code == "fulfilled")
        {
          Console.WriteLine($"\nSpot Instance request {requestId} " +
            $"has been fulfilled by instance {requestInfo.InstanceId}.\n");
          break;
        }

        // Wait a bit and try again, longer each time (1, 2, 4, ...)
        Thread.Sleep(wait);
        wait = wait * 2;
      }

      // Show the user how long it took to fulfill the Spot Instance request.
      TimeSpan span = DateTime.Now.Subtract(start);
      Console.WriteLine($"That took {span.TotalMilliseconds} milliseconds");

      // Perform actions here as needed.
      // For this example, simply wait for the user to hit a key.
      // That gives them a chance to look at the EC2 console to see
      // the running instance if they want to.
      Console.WriteLine("Press any key to start the cleanup...");
      Console.ReadKey(true);

      // Cancel the request.
      // Do this first to make sure that the request can't be re-fulfilled
      // once the Spot Instance has been terminated.
      Console.WriteLine("Canceling Spot Instance request...");
      await CancelSpotInstanceRequest(ec2Client, requestId);

      // Terminate the Spot Instance that's running.
      Console.WriteLine("Terminating the running Spot Instance...");
      await TerminateSpotInstance(ec2Client, requestId);

      Console.WriteLine("Done. Press any key to exit...");
      Console.ReadKey(true);
    }


    //
    // Method to create a Spot Instance request
    private static async Task<SpotInstanceRequest> CreateSpotInstanceRequest(
      IAmazonEC2 ec2Client, string amiId, string securityGroupName,
      InstanceType instanceType, string spotPrice, int instanceCount)
    {
      var launchSpecification = new LaunchSpecification{
        ImageId = amiId,
        InstanceType = instanceType
      };
      launchSpecification.SecurityGroups.Add(securityGroupName);
      var request = new RequestSpotInstancesRequest{
        SpotPrice = spotPrice,
        InstanceCount = instanceCount,
        LaunchSpecification = launchSpecification
      };

      RequestSpotInstancesResponse result =
        await ec2Client.RequestSpotInstancesAsync(request);
      return result.SpotInstanceRequests[0];
    }


    //
    // Method to get information about a Spot Instance request, including the status,
    // instance ID, etc.
    // It gets the information for a specific request (as opposed to all requests).
    private static async Task<SpotInstanceRequest> GetSpotInstanceRequestInfo(
      IAmazonEC2 ec2Client, string requestId)
    {
      var describeRequest = new DescribeSpotInstanceRequestsRequest();
      describeRequest.SpotInstanceRequestIds.Add(requestId);

      DescribeSpotInstanceRequestsResponse describeResponse =
        await ec2Client.DescribeSpotInstanceRequestsAsync(describeRequest);
      return describeResponse.SpotInstanceRequests[0];
    }


    //
    // Method to cancel a Spot Instance request
    private static async Task CancelSpotInstanceRequest(
      IAmazonEC2 ec2Client, string requestId)
    {
      var cancelRequest = new CancelSpotInstanceRequestsRequest();
      cancelRequest.SpotInstanceRequestIds.Add(requestId);

      await ec2Client.CancelSpotInstanceRequestsAsync(cancelRequest);
    }


    //
    // Method to terminate a Spot Instance
    private static async Task TerminateSpotInstance(
      IAmazonEC2 ec2Client, string requestId)
    {
      var describeRequest = new DescribeSpotInstanceRequestsRequest();
      describeRequest.SpotInstanceRequestIds.Add(requestId);

      // Retrieve the Spot Instance request to check for running instances.
      DescribeSpotInstanceRequestsResponse describeResponse =
        await ec2Client.DescribeSpotInstanceRequestsAsync(describeRequest);

      // If there are any running instances, terminate them
      if(   (describeResponse.SpotInstanceRequests[0].Status.Code
              == "request-canceled-and-instance-running")
         || (describeResponse.SpotInstanceRequests[0].State == SpotInstanceState.Active))
      {
        TerminateInstancesResponse response =
          await ec2Client.TerminateInstancesAsync(new TerminateInstancesRequest{
            InstanceIds = new List<string>(){
              describeResponse.SpotInstanceRequests[0].InstanceId } });
        foreach (InstanceStateChange item in response.TerminatingInstances)
        {
          Console.WriteLine($"\n  Terminated instance: {item.InstanceId}");
          Console.WriteLine($"  Instance state: {item.CurrentState.Name}\n");
        }
      }
    }
  }
}