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Remove CAST resources from EKS cluster

Based on the way how CAST was used on a cluster there are two options to remove CAST resources.

Disconnect EKS cluster

In order to disconnect your cluster from CAST AI click Disconnect cluster button in Clusters list and follow the guidance. Alternatively run following command from your terminal used to access the cluster:

kubectl delete deployment castai-agent -n castai-agent

On top of that, also delete following kubernetes objects related to castai-agent agent:

  • namespace
  • serviceaccount and secret
  • clusterrole and clusterrolebinding
  • role and rolebinding
  • resourcequota
  • configmap

Once cluster is disconnected its Status will change to Disconnected and you can choose to remove it from console by pressing Delete cluster button.

Cluster will continue to run as normal, since Delete cluster action only removes it from CAST AI console.

Removing CAST AI credentials and other resources

When CAST was used to to optimize EKS cluster following resources were created:

  • CAST AI agent deployment
  • User
  • Policy
  • Roles
  • Lambda function
  • Instances
  • Security group

To remove them follow the steps outlined below.

Prerequisites

In order to remove these resources first of all:

  • Go to CAST AI console → Autoscaler page → Disable all CAST AI policies
  • Connect to your cluster from the terminal and run command:
kubectl delete deployment castai-agent -n castai-agent

With above mentioned pre-requisites completed please follow next steps in AWS Management Console to remove CAST resources from your running cluster:

Delete user

Go to AWS console → Identity and Access Management (IAM) → Users → find “cast-eks-cluster-name” user. Select the user and click Delete user.

Delete policy

Go to AWS console → Identity and Access Management (IAM) → Customer managed policies → find CastEKSPolicy. Mark it, go to Policy actions → Delete policy.

Delete Lambda role

Go to AWS console → Identity and Access Management (IAM) → Roles → find lambda role CastLambdaRoleForSpot, delete it.

Delete Lambda function

Go to AWS console → Services → Lambda → find Lambda function cast-ai-ec2-events-handler and delete it.

In case you are planning to delete the cluster, complete these additional steps before proceeding with deletion:

Delete CAST role

Go to AWS console → Identity and Access Management (IAM) → Roles → find role "cast-cluster-name-eks-#######", delete it.

Delete instances

Go to EC2 dashboard → Security groups → Instances → find CAST created instance(s) “cluster-name-cast-#####…”. Terminate instance(s).

If you have you used PODs with attached storage go to Volumes and delete Volumes attached to CAST AI created nodes.

Delete security group

Go to EC2 dashboard → Security groups → find “cast-cluster-name-cluster/CastNodeSecurityGroup”. Delete security group.