Why are all the EC2 Host Permissions needed in an AWS Cluster even when it is configured by Cloudformation template?

Solution Verified - Updated -

Issue

  • Why are the below permissions needed in a RHOCP Cluster deployed on AWS using 'Cloudformation` template.
ec2:DescribeSubnets
ec2:CreateSecurityGroup
ec2:DescribeSecurityGroups
ec2:DeleteSecurityGroup
ec2:DescribeRouteTables
ec2:DescribeVolume*
ec2:CreateVolume
ec2:AttachVolume
ec2:DetachVolume
ec2:DeleteVolume
ec2:CreateVolume
ec2:AttachVolume
  • What is necessity of these permissions when Cloudformation template is created beforehand ?

Environment

  • Red Hat OpenShift Container Platform
    • 3.x on AWS

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