Spotter

Production-grade spot instance scheduling for EKS worker nodes

Spotter intelligently manages EC2 spot instances as EKS worker nodes, automatically finding the cheapest ARM64 instances across availability zones while handling interruptions gracefully. Achieves 70-80% cost savings over on-demand instances.

Features

• Real-time Pricing Analysis: Continuous spot price monitoring with automatic instance selection
• Multi-AZ Distribution: Optimal instance placement across availability zones
• Interruption Resilience: Automatic replacement with fallback instance types
• ARM64 Optimization: Targets modern ARM64 families (c7g, c8g, m7g, m8g, r7g, r8g)
• EKS Integration: Native integration via CloudFormation launch templates

Architecture

Core Components

Spotter Lambda

• Analyzes spot pricing every 10 minutes
• Stores top 6 cheapest instances per AZ in SSM parameters
• Filters for ARM64, current-generation, non-burstable instances

InstanceRunner Lambda

• Launches instances based on pricing recommendations
• Handles spot interruption events with same-AZ replacement
• Implements intelligent fallback on Capacity issues

Installation

Prerequisites

• AWS CLI configured with appropriate permissions
• SAM CLI installed
• EKS cluster with kubectl access
• EC2 Spot service-linked role

pip install spotter-cli

Quick Start

# Bootstrap Infrastructure
$ spotter bootstrap --region us-west-2

# Onboard EKS Cluster
$ spotter onboard my-cluster --region us-west-2

# Launch Instances
$ spotter scale my-cluster --count 3 --region us-west-2

Scale to count

--scale-to-count will scale up or down to the count specified

$ spotter scale my-cluster --count 7 --scale-to-count --region us-west-2

Rebalancing

rebalance will make the instance spread across AZ's

$ spotter rebalance my-cluster --region us-west-2

Commands

bootstrap        Deploy Spotter infrastructure
destroy          Destroy Spotter infrastructure
onboard          Onboard an EKS cluster to spotter
list-clusters    List onboarded clusters
offboard         Remove a cluster from Spotter
scale            Scale Spotter instances for a cluster
list-instances   Show current instance status for a cluster
rebalance        Rebalance instances across availability zones
refresh-prices   Refresh spot pricing data
pricing          View spot pricing data  

Data Storage

Pricing data stored in SSM parameters:

• /spotter/prices/{az} - Top 6 instances per availability zone
• /spotter/settings/{cluster} - Cluster configuration

Monitoring & Troubleshooting

CloudWatch Logs

• /aws/lambda/Spotter - Pricing analysis logs
• /aws/lambda/InstanceRunner - Instance launch logs

Troubleshooting

See docs/troubleshooting.md for comprehensive troubleshooting guidance.

Cleanup

Remove all Spotter resources:

spotter destroy --region us-west-2

For cluster-specific cleanup:

spotter offboard my-cluster --region us-west-2

---

Vibe coded with Amazon Q