Why is Instance Flexibility needed?
Spot instances are unused EC2 capacity which means the amount of it available in any one specific instance type and size varies over time. So by using more than one instance option you increase the pool of capacity you have access to, achieving greater scale and reducing the impact of any one capacity pool getting interrupted.
As spot instances are often 70 to 90 percent cheaper than on-demand instances. You’ll often be able to find more powerful instances and still save a fortune.
For example, if you needed two vCPUs and four gigs of memory you might choose the c4.large. On the spot that’s a 71 percent discount versus c4.large on-demand.
However, even the m4.large is a 70 percent discount on the spot versus running the c4.large on-demand despite the fact that has two vCPUs and eight gigs of memory.
So hopefully by now, you understand why instance flexibility is so important and agree it is possible to use more than one instance type while saving a fortune.
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?