This document discusses Amazon EC2 Spot Instance pools and how Auto Scaling groups can leverage Spot Instances. It explains that each EC2 instance family, size, availability zone, and region makes up a separate Spot pool with different prices. It describes how Auto Scaling groups can use either a capacity-optimized or lowest-price Spot allocation strategy to determine which Spot pools to use. The document also discusses how different instance types can be assigned weights to control their proportional contribution to an Auto Scaling group's total capacity.

2. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
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Cobus Bernard
Sr Developer Advocate
AWS
@cobusbernard
cobusbernard
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4. Amazon EC2 Spot Instance pools explained
$0.27 $0.29$0.50
1b 1c1a
8XL
$0.30 $0.16$0.214XL
$0.07 $0.08$0.082XL
$0.05 $0.04$0.04XL
$0.01 $0.04$0.01L
C4
$1.76
On
demand
$0.88
$0.44
$0.22
$0.11
Each instance family
Each instance size
Each availability zone
In every Region
Is a separate Spot pool
R5
M4
M5
I3 C5R4
i3en R5a
R5d

5. ASG capacity-optimized allocation strategy
us-east-1a
Desired capacity: 12
SpotAllocationStrategy: capacity-optimized
OnDemandBaseCapacity: 0 OnDemandPercentageAboveCapacity: 0
r5.large
m4.large
m5.large
R5 R5
R5 R5
us-east-1b us-east-1c
Overrides: [“r5.large”, “m4.large”, ”m5.large”]
$$
$
$$$
r5.large
m4.large
m5.large
$$$
$$
$
r5.large
m4.large
m5.large
$
$$$
$$

6. ASG lowest-price allocation strategy
us-east-1a
Desired capacity: 12
SpotAllocationStrategy: lowest-price
OnDemandBaseCapacity: 0 OnDemandPercentageAboveCapacity: 0
r5.large
m4.large
m5.large
R5 R5
R5 R5
us-east-1b us-east-1c
Overrides: [“r5.large”, “m4.large”, ”m5.large”]
$$
$
$$$
r5.large
m4.large
m5.large
$$$
$$
$
r5.large
m4.large
m5.large
$
$$$
$$

7. m4.xlarge Spot
Weight of 1
m4.2xlarge Spot
Weight of 2
m4.4xlarge On-Demand
Weight of 4
Availability
Zone 1
Availability
Zone 2
Availability
Zone 3
Different
instance types
contribute
differently to
total capacity
Now: Spot, On-Demand, and RIs in a single ASG with weights

8. Amazon EC2 Spot Instance pools explained
$0.27 $0.29$0.50
1b 1c1a
8XL
$0.30 $0.16$0.214XL
$0.07 $0.08$0.082XL
$0.05 $0.04$0.04XL
$0.01 $0.04$0.01L
C4
$1.76
On
demand
$0.88
$0.44
$0.22
$0.11
16
Weight
8
4
2
1
$0.11
Weighted
price
$0.11
$0.11
$0.11
$0.11
$0.017 $0.018$0.032
1b 1c1a
$0.038 $0.02$0.032
$0.016 $0.02$0.021
$0.025 $0.04$0.02
$0.01 $0.04$0.01

9. Thank you!
© 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Cobus Bernard
Sr Developer Advocate
Amazon Web Services
@cobusbernard
cobusbernard
cobusbernard