Agent skill
castai-install-auth
Install and configure CAST AI agent on a Kubernetes cluster with API key authentication. Use when onboarding a cluster to CAST AI, setting up Helm charts, or configuring Terraform provider authentication. Trigger with phrases like "install cast ai", "connect cluster to cast ai", "cast ai setup", "cast ai api key", "cast ai helm install".
Install this agent skill to your Project
npx add-skill https://github.com/jeremylongshore/claude-code-plugins-plus-skills/tree/main/plugins/saas-packs/castai-pack/skills/castai-install-auth
SKILL.md
CAST AI Install & Auth
Overview
Connect a Kubernetes cluster (EKS, GKE, AKS, or KOPS) to CAST AI for cost optimization, autoscaling, and security scanning. Covers API key generation, Helm chart installation of the CAST AI agent, and Terraform provider setup.
Prerequisites
- A running Kubernetes cluster (EKS, GKE, AKS, or KOPS)
kubectlconfigured with cluster admin accesshelmv3 installed- A CAST AI account at https://console.cast.ai
Instructions
Step 1: Generate an API Key
Log in to https://console.cast.ai and navigate to API > API Access Keys. Create a Full Access key for Terraform-managed clusters, or Read-Only for monitoring-only.
export CASTAI_API_KEY="your-api-key-here"
# Verify the key works
curl -s -H "X-API-Key: ${CASTAI_API_KEY}" \
https://api.cast.ai/v1/kubernetes/external-clusters | jq '.items | length'
Step 2: Install the CAST AI Agent via Helm
# Add the CAST AI Helm repository
helm repo add castai-helm https://castai.github.io/helm-charts
helm repo update
# Install the read-only monitoring agent (Phase 1)
helm upgrade --install castai-agent castai-helm/castai-agent \
-n castai-agent --create-namespace \
--set apiKey="${CASTAI_API_KEY}" \
--set provider="eks" # eks | gke | aks
kubectl get pods -n castai-agent
Step 3: Enable Full Automation (Phase 2)
export CASTAI_CLUSTER_ID="your-cluster-id"
# Cluster controller -- manages node lifecycle
helm upgrade --install cluster-controller castai-helm/castai-cluster-controller \
-n castai-agent \
--set castai.apiKey="${CASTAI_API_KEY}" \
--set castai.clusterID="${CASTAI_CLUSTER_ID}"
# Evictor -- consolidates underutilized nodes
helm upgrade --install castai-evictor castai-helm/castai-evictor \
-n castai-agent \
--set castai.apiKey="${CASTAI_API_KEY}" \
--set castai.clusterID="${CASTAI_CLUSTER_ID}"
# Spot handler -- graceful spot instance interruption
helm upgrade --install castai-spot-handler castai-helm/castai-spot-handler \
-n castai-agent \
--set castai.provider="eks" \
--set castai.clusterID="${CASTAI_CLUSTER_ID}"
Step 4: Terraform Provider (Alternative)
terraform {
required_providers {
castai = {
source = "castai/castai"
version = "~> 7.0"
}
}
}
provider "castai" {
api_token = var.castai_api_token
}
variable "castai_api_token" {
type = string
sensitive = true
}
resource "castai_eks_cluster" "this" {
account_id = data.aws_caller_identity.current.account_id
region = var.aws_region
name = var.cluster_name
}
Step 5: Verify Connection
curl -s -H "X-API-Key: ${CASTAI_API_KEY}" \
"https://api.cast.ai/v1/kubernetes/external-clusters/${CASTAI_CLUSTER_ID}" \
| jq '{name: .name, status: .status, agentStatus: .agentStatus}'
# => { "name": "my-cluster", "status": "ready", "agentStatus": "online" }
Error Handling
| Error | Cause | Solution |
|---|---|---|
401 Unauthorized |
Invalid or expired API key | Regenerate at console.cast.ai > API |
403 Forbidden |
Key lacks permissions | Use Full Access key for write operations |
Agent CrashLoopBackOff |
RBAC misconfiguration | Check kubectl logs -n castai-agent |
cluster not found |
Wrong cluster ID | Verify ID at console.cast.ai > Clusters |
| Helm chart not found | Repo not added | Run helm repo add castai-helm ... |
Resources
Next Steps
Proceed to castai-hello-world to query cluster savings and node status.
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