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IPI-Cluster-Hibernation.md

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IPI Cluster Hibernation

Summary

This document describes the possible design and implementation of a method to hibernate IPI (ocp) clusters.

Context

  • IPI clusters do not have a hibernation support yet

  • An active IPI cluster uses multiple cloud resources in backend

  • Cumulative cost of these cloud resource turns to be the cloud cost to host the IPI cluster

  • Top cloud resource to contribute to the cluster cost is:

    • EC2 instances

Hibernation Design & Implementation

  • Find all the running EC2 instances for a given IPI cluster

  • The corresponding EC2 instances should be stopped (NOT terminated)

  • This would save the cost of EC2 instances for the duration of hibernation

Resume Design & Implementation

  • Find all the stopped EC2 instances for a given IPI cluster

  • The corresponding EC2 instances should be started

  • As soon as the instances are up and running, the cluster will be back to the active running state