Open In App

Amazon Web Services – Spot Rules in EC2 Spot Instances

Last Updated : 08 May, 2023
Improve
Improve
Like Article
Like
Save
Share
Report

In this article, we are going to walk through a few simple rules to follow when launching Amazon EC2 spot instances. Spot instances enable you to optimize costs on an AWS cloud and scale the throughput of your application up to 10 times for the same budget.

To help users manage their Spot Instances, AWS provides Spot Rules. These are settings that allow users to define when their Spot Instances should start, stop, or terminate based on certain conditions

  1. Interruption Behavior: This rule defines the action to take when the Spot Instance is interrupted by AWS due to spot market fluctuations or other reasons. Users can choose to either stop, terminate, or hibernate the instance.
  2. Start Time: Users can specify the earliest time the Spot Instance should start. This allows users to launch instances during off-peak hours when Spot prices are lower.
  3. End Time: Users can specify the latest time the Spot Instance should run. This can help users avoid incurring unexpected charges if the Spot price spikes above their budget.
  4. Instance Types: Users can specify the type of instances they want to launch. This can help users optimize their workloads for specific use cases.
  5. Maximum Price: Users can specify the maximum price they are willing to pay for the Spot Instance. If the Spot price exceeds this value, the instance will be terminated.

In this article, we will discuss two simple rules to follow when thinking about launching spot instances:

Rule 1: 

Spot pools have separate prices and change less frequently. Each instance type, size, and availability zone in every region is a separate spot pool. 

For example, take a look at the below image where c3.2xlarge in us-east-1c has a separate price and for c4.8xlarge in us-east-1d has a separate price for c3.2xlarge  is $10.9 right now. But it could be $0.9 tomorrow and it adjusts based on long-term supply and demand.

c3.2xlarge on US east 1c

c4.8xlarge on US east 1d

Rule 2:

Amazon EC2 will give you a two-minute warning when AWS needs the capacity back. 

You can request spot capacity similar to on-demand and always pay the current spot price. When AWS needs the capacity back, you will get a two-minute warning. AWS sends you the notification about the spot instant status. There are two reasons your spot instance could be marked for termination:

  1. The current spot price has risen above your maximum willingness to pay.
  2. The capacity is no longer available to serve your instance.

The bit status of your spot instance request is set to marked for termination and spot termination time metadata is set to a time precisely two minutes in the future.

Example 1: Response you will get when you call describe-spot-instance-requests API for the instance that got marked for termination.

"Status": {
            "Update Time" : "2022-03-02T18:16:21.000z",
            "Code" : "marked-for-termination",
            "Message" : "The Spot Instance is marked for termination",
        },

Example 2: Response you will get when you call describe-spot-instance-requests API for the instance that got terminated.

"Status": {
            "Update Time" : "2022-03-02T18:16:21.000z",
            "Code" : "instance-terminated-capacity-oversubscribed",
            "Message" : "Your Spot Instance was terminated as there
                            is no more unused capacity available
                            in this pool.",
        },

AWS EC2 Spot Instances Termination:

When using Amazon EC2 Spot Instances, it is important to be aware that AWS may need the capacity back and will give a two-minute warning before terminating the spot instance. There are two reasons your spot instance may be marked for termination:

  1. The current spot price has risen above your maximum willingness to pay.
  2. The capacity is no longer available to serve your instance.

When AWS needs the capacity back, the status of your spot instance request will be set to “marked for termination” and the spot termination time metadata will be set to a time exactly two minutes in the future. If the instance is actually terminated, the status will be updated to “instance-terminated” with a specific message indicating the reason for the termination.


Similar Reads

Amazon Web Services - Flexibility in EC2 Spot Instances
In this article, we are going to look into the key points to keep in mind while using an Amazon EC2 Spot Instances effectively with instance flexibility. Here we will try to answer the three key questions: Why is Instance Flexibility needed?How to manage Spot instance using EC2 Fleet for your environment?Why is Instance Flexibility needed? Spot ins
4 min read
Amazon Web Services - Introduction to EC2 Spot Instances
In this article, we will look into the process of profiling your applications and workloads to confirm if they can take advantage of Amazon EC2 spot instances. Spot instances are spare compute capacity available to you at steep discounts (often as much as 90% cheaper) compared to on-demand prices. The reason you need to qualify for the spot is that
8 min read
AWS EC2 On Demand and Spot Instances
In this article, we are going to understand difference between EC2 On demand and Spot instances. We are going to learn their usage and working. it is important to understand the difference between AWS EC2 On Demand and Spot Instances so that you can choose right instances for your business requirement. AWS EC2 (Elastic Compute Cloud) is a cloud com
6 min read
How To Scanning Amazon EC2 Instances With Amazon Inspector
Amazon Inspector is a vulnerability management service that continuously scans your running Amazon EC2 instances, container images in Amazon Elastic Container Registry (Amazon ECR), and AWS Lambda functions. Now here we see how to scan Amazon ec2 instances with Amazon Inspector. Amazon Inspector EC2 scanning extracts metadata from your EC2 instance
3 min read
Amazon Web Services - Auto Scaling Amazon EC2
Scalability refers to the capacity of a software solution to manage rising workloads. In simple terms, it is the ability of a system to readily add extra processing resources to handle the increased loads. Scaling Amazon EC2 means you start with the resources you require at the time of starting your service and build your architecture to automatica
13 min read
How To See All Running Amazon EC2 Instances Across All Regions At Once?
EC2, or Elastic Compute Cloud, is a core service provided by Amazon Web Services (AWS) that is used to create virtual servers on the AWS cloud platform. The one that we create using the EC2 service is called an EC2 instance. We can use this EC2 instance to deploy and run a wide variety of applications, ranging from simple websites to complex enterp
4 min read
Amazon Web Services - Denying Access using IAM policy for EC2 and EBS Instance
In this article, we will look into how to use AWS identity and access management policy conditions to create an IAM policy that denies access to create amazon elastic compute cloud instances and amazon elastic block store volumes when the required tags are not passed along with the creation request. We will also look into how you can use the IAM po
4 min read
Amazon Web Services - Replacing Unhealthy EC2 Instance in Elastic Beanstalk Environment
In this article, we will look into how to automate the replacement of EC2 instances in an AWS Elastic Beanstalk environment that are failing Elastic Load Balancer health checks. By default, the Elastic Beanstalk environment's Auto Scaling group health check configuration is set to the EC2 type which simply performs a status check of EC2 instances.
2 min read
How To Create Spot Instance In Aws-Ec2 In Aws Latest Wizards?
Spot instances are available at up to 90% discount because when instances are not used then the instance available in spot instance at a cheaper rate so that people can utilize. it. When the demand increases then amazon sent a notification your spot instance will disappear after two minutes. We can use it for temporary work if our data losses it wi
6 min read
How To Create EC2 Instances Using SDK For JAVA ?
The AWS SDK for Java provides various functionalities to use AWS services using APIs. It provides support for building Java applications easily with the help of the SDK. Using the SDK makes it easier to procure AWS services directly from Java code. Creating and provisioning EC2 instances from Java is possible through the SDK. Let's see how to perfo
5 min read