Spot instance

 AWS EC2 spot instances  are using the spare capacity in AWS cloud and provide you EC2 instance at individual requested price.

 At any point of time,AWS can reclaim(terminate ) your instance to the highest bidder with 2 minutes of notification.

you can use AWS EC2 spot instance for machine critical appications.

Do not run critical jobs on EC2 if you can't tolerate failure!.

Hands on:

from the EC2 instance launch page, Navigate to instances --> Spot Requests from the left menu.

Click on Request spot instances.                                                                                                                     

Then the screen prompts to screen where we need to provide all the inputs for spot instance. provide all your inputs based on your requirements.

Finally click on launch.  

Spot instances and Spot Fleets

Amazon EC2 Spot instances: let you take advantage of unused EC2 capacity in the AWS cloud. Spot instances are available at up to a 90% discount compared to On- Demand prices. You can use Spot instances for various stateless, fault-tolerant, or flexible applications, such as big data, containerized workloads, CI/CD, web servers, high -performance computing (HPC), and other test and development workloads.

Usually Spot Instances will be used to systems where continuation  system is not required. termination notification of system will be notified with in 2 mins of time only.

Spot Blocks: To stop your spot instances from being terminated even if the spot price goes over your max spot price. You can set spot blocks for between one to six hours currently.

Spot Fleets:

Spot Fleets will try and match the target capacity with your price restraints.