Create Autoscaling Group with more instance types and purchase options

create-asg.sh

#!/bin/bash
# make sure your awscli version is >= 1.16.56
#
# 1. create a launch template and copy the LaunchTemplateId
# 2. create mix-policy.json
# 3. run create-asg.sh
#
# by pahudnet@gmail.com

asgname=demo

aws autoscaling create-auto-scaling-group \
--auto-scaling-group-name=$asgname \
--min-size=2 \
--desired-capacity=8 \
--max-size=10 \
--vpc-zone-identifier=subnet-01afddf2fa02affaf,subnet-052e393860f11bde9,subnet-0be531a55836fef9c \
--mixed-instances-policy=file://mix-policy.json

mix-policy.json

{
  "LaunchTemplate": {
    "LaunchTemplateSpecification": {
      "LaunchTemplateId": "lt-0bc5d3f873b573e3c"
    },
    "Overrides": [
      {
        "InstanceType": "t3.small"      
      },
      {
        "InstanceType": "t3.medium"      
      },
      {
        "InstanceType": "t3.large"      
      },
      {
        "InstanceType": "t3.xlarge"      
      }
    ]
  },
  "InstancesDistribution": {
    "OnDemandAllocationStrategy": "prioritized",
    "OnDemandBaseCapacity": 2,
    "OnDemandPercentageAboveBaseCapacity": 0,
    "SpotAllocationStrategy": "lowest-price",
    "SpotInstancePools": 10  
  }
}

Thanks! You have saved me from figuring that out myself.