Harness Cluster Orchestrator Installation Guide

This guide covers the installation and setup of Harness Cluster Orchestrator for AWS EKS clusters using the enablement script.

Prerequisites

Required Tools

Tool	Minimum Version	Purpose
AWS CLI	2.15.10	AWS service interaction and IAM configuration
Helm	v3.x	Kubernetes package management (recommended)
kubectl	1.20+	Kubernetes cluster management

AWS Permissions

Your AWS credentials must have permissions for:

• EKS: Describe clusters, update cluster configuration
• IAM: Create/update roles, policies, and instance profiles
• EC2: Create/modify tags, describe instances and security groups
• STS: Assume roles for OIDC provider integration

Kubernetes Permissions

Your kubectl context must have cluster-admin permissions or equivalent to:

• Create namespaces, deployments, and services
• Create and modify CRDs (Custom Resource Definitions)
• Create service accounts and RBAC resources
• Install Helm charts

Harness Prerequisites

1. Active Harness Account with CCM module enabled
2. Kubernetes Connector configured for your cluster
3. API Token with CCM permissions

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Environment Variables

Required Variables

Variable	Description	Example
CLUSTER_NAME	EKS cluster name as it appears in AWS	production-eks-cluster
REGION	AWS region where your cluster is deployed	us-west-2
CCM_K8S_CONNECTOR_ID	Harness CCM Kubernetes connector ID	prod_eks_connector
TOKEN	Harness API token for authentication	sat.myaccount.abc123...

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Installation Methods

Helm Installation

Helm provides:

• Lifecycle Management - Easy upgrades, rollbacks, and uninstallation
• Configuration Management - Centralized values.yaml for all settings
• Version Control - Track installed versions and changes
• Atomic Operations - All-or-nothing deployments with automatic rollback

To see detailed instructions for Helm installation, refer to the Helm Installation Guide.

kubectl Installation

Direct kubectl installation using YAML manifests is supported for backward compatibility.

To see detailed instructions for kubectl installation, refer to the kubectl Installation Guide.

Migration from kubectl to Helm

If you have an existing kubectl-based installation, the script provides automated migration:

1. Run the enablement script as you normally would
2. Script detects existing kubectl-managed deployments
3. Prompt appears:

   Legacy kubectl deployment detected.
   Migrate to Helm? (upgrades, rollbacks, history - ~1-2 min downtime)
   Migrate to Helm? (y/n):

4. Enter y to proceed with migration

The script will:

• Scale down existing deployments to 0 replicas
• Delete old kubectl-managed resources
• Label existing CRDs for Helm adoption
• Install fresh via Helm with same configuration

Expected Downtime: 1-2 minutes during migration

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Autoscaler Management

Cluster Orchestrator replaces traditional Kubernetes autoscalers. The script automatically detects and manages existing autoscalers.

Automatic Detection

The script checks for existing autoscalers in:

• Karpenter: karpenter-system and kube-system namespaces
• Cluster Autoscaler: kube-system namespace
• Custom locations: Interactive mode allows specifying custom namespaces

Scale-Down Process

Interactive Mode:

1. Script displays detected autoscaler details
2. Prompts for confirmation to scale down
3. Scales deployment to 0 replicas (does not delete)
4. Continues with installation

Non-Interactive Mode (AUTO_APPROVE=true):

• Automatically scales down detected autoscalers
• No user confirmation required
• All actions logged for audit trail

Legacy Karpenter Detection

If legacy Karpenter v1alpha5 provisioners are detected, the script will:

1. Display a warning message
2. Exit with instructions to upgrade Karpenter first
3. Provide a link to the Karpenter upgrade guide

Note: You must upgrade to Karpenter v1beta1 or later before enabling Cluster Orchestrator.

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Installation Steps

Step 1: Set Environment Variables

# Required
export CLUSTER_NAME="your-cluster-name"
export REGION="us-west-2"
export CCM_K8S_CONNECTOR_ID="your_connector_id"
export TOKEN="your-harness-api-token"

# Optional
export INSTALL_NAMESPACE="kube-system"
export VPA_ENABLED=false
export CLUSTER_ORCH_CHANNEL="stable"

Step 2: Configure kubectl Context

# Update kubeconfig for your EKS cluster
aws eks update-kubeconfig --name $CLUSTER_NAME --region $REGION

# Verify connection
kubectl cluster-info
kubectl get nodes

Step 3: Run the Enablement Script

Get the enablement script from the Harness UI:

1. Navigate to Cloud Costs > Cluster Orchestrator
2. Click Enable Cluster Orchestrator
3. Select your cluster and click Generate Script
4. Run the generated command

curl -fsSL https://app.harness.io/gateway/ccm/api/cluster-orchestrator/enable-script?accountIdentifier=YOUR_ACCOUNT_ID | bash

Step 4: Verify Installation

# Check Cluster Orchestrator pods
kubectl get pods -n $INSTALL_NAMESPACE | grep -E "cluster-orch|harness"

# Check Helm release (if installed via Helm)
helm list -n $INSTALL_NAMESPACE

# Verify in Harness UI
# Navigate to Cloud Costs > Cluster Orchestrator
# Your cluster should show "Connected" status

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