Commits on Feb 28, 2023

1. Enable using AWS spot instances …

   The patch enables the use of AWS spot instances for workers, infra, and workload nodes, except for the controller nodes, which will be deployed as normal instance types.
   To use this feature, a new environment variable SPOT_INSTANCE_ZONE must be set to the zone where the spot instances would be deployed.
   Example:
       export SPOT_INSTANCE_ZONE=us-east-2a 
   
   The instance type for the nodes will use the existing environment variables OPENSHIFT_WORKER_INSTANCE_TYPE, OPENSHIFT_INFRA_NODE_INSTANCE_TYPE, and OPENSHIFT_NODE_INSTANCE_TYPE.
   
   The spot instance type available for use in a zone can be obtained from the AWS spot request console. 
   Have created a script spotlst.sh(https://gist.github.com/yogananth-subramanian/1e69b11c4ce1564cbbc612f61ea05031), that can be used to pick the spot instance type and zone to use, it provides details about interrupt percentage per instance_type for each zone and their corresponding spot pricing and savings percentage over on-demand price.
   
   Example:
     ./spotlst.sh --mincpu 4 --maxcpu 4 --minmem 16 --maxmem 16 --intr 1 -region us-east-1,us-east-2 --inst m5.xlarge 
      Using minimum price of the on-demand instance as maximum price for spot intance 0.1920000000
      region,zone,instance_type,price,savings,iterrupt
      us-east-2,us-east-2a,m5.xlarge,0.041400,79,0

   

   yogananth-subramanian committed Feb 28, 2023
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