Amazon Web Services
docs.aws.amazon.com › amazon ec2 › user guide › ec2 fleet and spot fleet
EC2 Fleet and Spot Fleet - Amazon Elastic Compute Cloud
June 16, 2016 - ... A fleet can launch into multiple Availability Zones, enabling you to reduce costs and improve availability. If your fleet includes Spot Instances, the fleet automatically selects Availability Zones based on your preferences regarding price and interruptions.
Spot.io
spot.io › resources › aws-autoscaling › aws-spot-fleet-the-first-step-to-saving-with-spot-instances
AWS Spot Fleet: The First Step to Saving with Spot Instances
October 12, 2025 - Amazon Web Services (AWS) Spot Fleets are collections of AWS spot instances, virtual servers from Amazon’s pool of spare capacity, offered at discounts of up to 90%. Spot instances need to be carefully managed, because they are terminated ...
amazon web services - What is the advantage of using Spot Fleet Autoscaling instead of AutoScaling Groups with a Spot Price? - Stack Overflow
Recently Amazon AWS released Auto Scaling for Spot Fleets (https://aws.amazon.com/blogs/aws/new-auto-scaling-for-ec2-spot-fleets/). Auto Scaling groups already allowed you to set a Spot Price to get Spot Instances at a discount instead of Reserved Instances. More on stackoverflow.com
Does a spot fleet work better than a single instance type?
It sounds like you don't really want a spot instance at all. You want to have one instance running at all times, and you reference some users who get annoyed when your service is down. This is not what spot instances are designed for. If you always want a single instance up at all times, and this is supporting some user-facing interactive service, don't use a spot instance. Consider an RI if you want to save money, but leave the spot instances for stuff where it really is OK for your instance to be yeeted into the void. More on reddit.com
10
4
September 6, 2020Spot Fleet vs ASG with spot
The auto scaling mixed instances stuff is only a week or two old. From a quick glance it is more limited than spot fleet. For example it doesn’t do weighting, for example if you had c5.large and c5.xlarge in there you can just say “I want 2 instances” whereas with spot fleet you can tell it that if it uses the smaller instance they only count for half (simplifying slightly). More on reddit.com
3
4
August 20, 2018Experience with spot instance fleet stability/availability
Starting from November 27 AWS changed to what they call "smooth price changes" ( see here for details ) which should prevent those spikes in pricing. That's why you see those graphs are no longer jerky after that date. I haven't seen any instance type going over ondemand price since then, but you can't rule out the possibility. As for what happens when it reaches ondemand pricing, it will prevent you from spinning new Spot instances in the AZ (sometimes even ondemand instances), and Spot instances already running may be terminated. You should keep a baseline of ondemand/reserved instances if you can't sustain a complete shutdown of all your machines in the rare event all AZs are over capacity. More on reddit.com
8
13
October 11, 2017Videos
AWS EC2 Spot Instances and Spot Fleet, AWS Certified Solutions ...
38:50
Master EC2 Spot Instances: Ultimate Guide to Massive Savings - ...
15:32
What are spot instances and spot fleet ? | Cloud With Mohsin - YouTube
26:29
Master AWS Spot Instances, Spot Fleet, T2 & T3: Boost Your Cloud ...
38:18
Leveraging Amazon EC2 Spot Best Practices Using the New Capacity ...
07:43
Did You Know That There Is an Amazon EC2 Spot Fleet Plugin for ...
CloudBolt Software
cloudbolt.io › home › eguides › the guide to aws cost optimization › the ultimate guide to ec2 spot instances
The Ultimate Guide to EC2 Spot Instances | CloudBolt Software
June 30, 2025 - The Amazon EC2 Spot Instances launch steps (Source: https://aws.amazon.com/) A Spot fleet is a collection of Spot instances (note that this collection can optionally contain On-Demand instances as well).
TechTarget
techtarget.com › searchaws › definition › AWS-Spot-Fleets-Amazon-Web-Services-Spot-Fleets
What is AWS Spot Fleets (Amazon Web Services ...
AWS also provides Auto Scaling, a tool to dynamically scale capacity to maintain instance health and performance.
AWS
learnaws.org › 2020 › 01 › 01 › aws-spot-fleet-reduce-cost-improve-reliability
How to use AWS Spot Fleet to lower costs and improve reliability
January 1, 2020 - One of the main differences between Spot Instances and Spot Fleets is that for Spot Instances you place a bid for a specific instance type in a specific AZ. This requests gets fulfilled if there is enough spare capacity. However, for a Spot Fleet, you can request a combination of different ...
Amazon Web Services
amazonaws.cn › products › amazon ec2 › amazon ec2 spot
Amazon EC2 Spot Instances FAQs
1 week ago - A Spot capacity pool is a set of ... the same instance type, operating system, Availability Zone, and network platform (EC2-Classic or EC2-VPC). Each spot capacity pool can have a different price based on supply and demand. We highly recommend using multiple Spot capacity pools to maximize the amount of Spot capacity available to you. EC2 provides built-in automation to find the most cost-effective capacity across multiple Spot capacity pools using Spot Fleet...
Jayendra's Cloud Certification Blog
jayendrapatil.com › aws-ec2-spot-instances
AWS EC2 Spot Instances
February 6, 2023 - Spot bid – maximum bid price the bidder is willing to pay for the spot instance. Spot fleet – set of instances launched based on the criteria of the bidder
AWS
aws.amazon.com › blogs › aws › ec2-fleet-manage-thousands-of-on-demand-and-spot-instances-with-one-request
EC2 Fleet – Manage Thousands of On-Demand and Spot Instances with One Request | Amazon Web Services
May 3, 2018 - EC2 Fleet Today we are extending and generalizing the set-it-and-forget-it model that we pioneered in Spot Fleet with EC2 Fleet, a new building block that gives you the ability to create fleets that are composed of a combination of EC2 On-Demand, Reserved, and Spot Instances with a single API call.
Amazon Web Services
docs.aws.amazon.com › amazon ec2 › user guide › amazon ec2 instances › amazon ec2 billing and purchasing options › spot instances
Spot Instances - Amazon Elastic Compute Cloud
A Spot Instance is an instance that uses spare EC2 capacity that is available for less than the On-Demand price. Because Spot Instances enable you to request unused EC2 instances at steep discounts, you can lower your Amazon EC2 costs significantly. The hourly price for a Spot Instance is called ...
Ec2spotworkshops
ec2spotworkshops.com › launching_ec2_spot_instances › ec2_fleet.html
Launching EC2 Spot Instances via EC2 Fleet :: EC2 Spot Workshops
An EC2 Fleet contains the configuration information to launch a fleet or group of instances. Using EC2 Fleet, you can define separate On-Demand and Spot capacity targets, specify the instance types that work best for your applications, and specify how Amazon EC2 should distribute your fleet capacity within each purchasing model.
NextRoll
tech.nextroll.com › blog › dev › ops › 2018 › 10 › 15 › x-marks-the-spot.html
$ marks the spot: saving a ton with EC2 Spot Fleet - NextRoll
October 15, 2018 - This article describes how we substantially reduced our EC2 costs by migrating this application entirely to EC2 Spot Fleet. A focus of the company has always been operational efficiency; money not spent is money earned, and reducing operating costs by $X is equivalent to earning $X / margin in additional revenue (plus the time value of money for avoided outlays). Historically, reducing operating costs for this application has been achieved by purchasing Reserved Instances: for a partial up-front reservation, in exchange for an up-front fee per instance an hourly fee is billed per instance-hour regardless of usage.
Nordcloud
nordcloud.com › home › content hub › everything you needed to know about spot instances
Everything you needed to know about spot instances
December 15, 2022 - You can then set up your bid price globally for around the same price as the m4.large On-demand price. Spot fleet then attempts to launch the specified instances that will result in the lowest cost.
InfoQ
infoq.com › news › 2018 › 05 › aws-ec2-fleet-single-api
AWS EC2 Fleet: Manage Thousands of On-Demand and Spot Instances with One Request - InfoQ
May 12, 2018 - With EC2 Fleet, customers can push their workloads to their instances to process them for the lowest possible price. By creating a template that contains several settings, including InstanceType, WeightedCapacity, and TargetCapacitySpecification containing the TotalTargetCapacity, OnDemandTargetCapacity, SpotTargetCapacity, and DefaultTargetCapacityType values, a customer can describe their fleet, taking advantage of the use of Spot Instances (the unused capacity within AWS, and the cheapest available VM’s within AWS EC2) to fulfills their needs.
CloudZero
cloudzero.com › home › blog › spot instances explained: how they can lower cloud costs
Spot Instances Explained: How They Can Lower Cloud Costs
July 9, 2024 - AWS offers several tools to help manage Spot Instances. Use the Spot Fleet to launch and manage many instance types spread across different Availability Zones.
Boltops
blog.boltops.com › 2018 › 07 › 15 › what-is-the-difference-between-spot-fleet-vs-spot-instances
What is the Difference Between Spot Fleet vs Spot Instances - BoltOps Blog
With spot fleets, you can request a variety of different instance types that meet your requirements. Additionally, you can spread your spot fleet bet across multiple AZs to increase the likelihood of getting your instance fulfilled. It’s like playing rollette and being able to bet a single chip on multiple numbers.
Ec2spotworkshops
ec2spotworkshops.com › launching_ec2_spot_instances › spot_fleet.html
(Optional) - Launching an EC2 Spot Instance via Spot Fleet request :: EC2 Spot Workshops
Spot Fleet allows you to diversify across different AZs and networks. However, unlike Auto Scaling groups, it does re-balance instances across AZs. Therefore, consider using Auto Scaling groups instead if AZ-rebalance is key for your workload.
Pump
pump.co › blog › aws-spot-fleet
AWS Spot Fleet - Optimize EC2 Costs & Performance
Pump uses AI & group buying to automate cloud savings with zero engineering input. #GetPumped
Top answer 1 of 3
3
I might've found a valid reason to keep using Auto Scaling Groups with Spot Instances: you can attach those to a load balancer / target group, while spot fleets can't do that as of now.
Not that it matters too much for my use case any way as my cluster is an ECS cluster and instances will get registered in target groups automatically when launching containers, but it's good to know anyway.
Edit: Apparently Spot Fleets do not support CreationPolicies either, so you're either left to use ASGs or have some fun with WaitConditions if that is needed.
2 of 3
3
The major advantage of Spot Fleet is that it re-balances instances across availability zones if an AZ is experiencing a price spike. In contrast, ASG would leave you with fewer running instances than you requested.
This, along with the ability to balance across instance types and not just availability zones, makes Spot Fleets much more reliable for maintaining a target capacity than ASG. They come at an opportune time, since spot prices are seeing ever greater volatility.
That said, Spot Fleet currently is missing a lot of features afforded by ASG, as Ruben mentioned.
The Cloudericks Blog
cloudericks.com › home › aws cloud › understanding ec2 spot instances, spot blocks, and spot fleets
Understanding EC2 Spot Instances, Spot Blocks, and Spot Fleets - The Cloudericks Blog
December 25, 2024 - PriceCapacityOptimized: Combines capacity optimization with cost-effectiveness, generally the best choice for a wide range of workloads. Automatic Management: The Spot Fleet handles the request and management of Spot Instances, ensuring the lowest price under your constraints.
Quora
quora.com › What-is-the-difference-between-a-normal-instance-and-a-spot-instance-in-AWS-Amazon-EC2-Why-is-one-more-valuable-than-the-other
What is the difference between a normal instance and a spot instance in AWS/Amazon EC2? Why is one more valuable than the other? - Quora
Answer: Regular (“On Demand”) instance is not more valuable, it’s just more expensive, because it’s guaranteed. If you spin it up successfully you “own” it and if it fails, AWS will spin up another one. It’s like a car rental. As far as the car rental contract is valid, you drive ...