Configuration Reference

GreenKube follows the 12-Factor App methodology — all configuration is driven by environment variables. When deployed via Helm, these are set through values.yaml.

Helm Values Reference

Image

Parameter	Description	Default
image.repository	Docker image repository	greenkube/greenkube
image.tag	Image tag	0.2.0
image.pullPolicy	Image pull policy	IfNotPresent

Database

Parameter	Description	Default
config.db.type	Storage backend: postgres, sqlite, elasticsearch	postgres
config.db.path	SQLite file path (if type is sqlite)	/data/greenkube_data.db
config.db.schema	PostgreSQL schema	public

Carbon & Energy

Parameter	Description	Default
config.cloudProvider	Cloud provider: aws, gcp, azure, ovh, scaleway	aws
config.defaultZone	Fallback carbon zone (ISO country code)	FR
config.defaultIntensity	Default grid intensity (gCO₂e/kWh) when API unavailable	500.0
config.normalizationGranularity	Intensity lookup granularity: hour, day, none	hour
config.defaults.pue	Power Usage Effectiveness factor	1.3
config.defaults.instance.vcores	Default vCPU count for unknown instances	1
config.defaults.instance.minWatts	Default min watts per vCPU	1.0
config.defaults.instance.maxWatts	Default max watts per vCPU	10.0

Prometheus

Parameter	Description	Default
config.prometheus.url	Prometheus URL (empty = auto-discovery)	""
config.prometheus.verifyCerts	Verify TLS certificates	true
config.prometheus.queryRangeStep	Range query step interval	5m
config.prometheus.queryRangeMaxSamples	Max data points per range query	10000
config.prometheus.nodeInstanceLabel	Node label for instance type	label_node_kubernetes_io_instance_type

OpenCost

Parameter	Description	Default
config.opencost.url	OpenCost URL (empty = auto-discovery)	""
config.opencost.verifyCerts	Verify TLS certificates	true

Node Analysis

Parameter	Description	Default
config.nodeAnalysisInterval	Interval for node analysis	5m
config.nodeDataMaxAgeDays	Max age for historical node data	30

API Server

Parameter	Description	Default
config.api.enabled	Enable the API server	true
config.api.host	API listen address	0.0.0.0
config.api.port	API listen port	8000

Recommendations

Parameter	Description	Default
config.recommendations.lookbackDays	Days of data for analysis	7
config.recommendations.rightsizingCpuThreshold	CPU usage ratio triggering rightsizing	0.3
config.recommendations.rightsizingMemoryThreshold	Memory usage ratio triggering rightsizing	0.3
config.recommendations.rightsizingHeadroom	Safety headroom multiplier	1.2
config.recommendations.zombieCostThreshold	Cost threshold for zombie detection ($)	0.01
config.recommendations.zombieEnergyThreshold	Energy threshold for zombie detection (J)	1000
config.recommendations.autoscalingCvThreshold	CV threshold for autoscaling suggestion	0.7
config.recommendations.autoscalingSpikeRatio	Max/avg ratio for spike detection	3.0
config.recommendations.carbonAwareThreshold	Intensity ratio for carbon-aware scheduling	1.5
config.recommendations.nodeUtilizationThreshold	Node utilization threshold	0.2
config.recommendSystemNamespaces	Include system namespaces in recommendations	false

Secrets

Parameter	Description	Default
secrets.electricityMapsToken	Electricity Maps API token	dummy_token
secrets.boaviztaToken	Boavizta API token	""
secrets.dbConnectionString	PostgreSQL connection string	""
secrets.prometheus.username	Prometheus basic auth username	""
secrets.prometheus.password	Prometheus basic auth password	""
secrets.prometheus.bearerToken	Prometheus bearer token	""

PostgreSQL (Bundled)

Parameter	Description	Default
postgres.enabled	Deploy bundled PostgreSQL	true
postgres.image.repository	PostgreSQL image	postgres
postgres.image.tag	PostgreSQL version	17-alpine
postgres.auth.username	Database username	greenkube
postgres.auth.password	Database password	greenkube_password
postgres.auth.database	Database name	greenkube
postgres.persistence.enabled	Enable persistent storage	true
postgres.persistence.size	Storage size	1Gi

Resources

Parameter	Description	Default
resources.requests.cpu	CPU request	100m
resources.requests.memory	Memory request	128Mi
resources.limits.cpu	CPU limit	500m
resources.limits.memory	Memory limit	512Mi

Environment Variables

When running outside Helm (Docker, source), use these environment variables:

Variable	Description	Default
DB_TYPE	postgres, sqlite, elasticsearch	postgres
DB_CONNECTION_STRING	PostgreSQL connection URL	—
DB_PATH	SQLite file path	/data/greenkube_data.db
ELASTICSEARCH_HOSTS	Elasticsearch endpoint(s)	—
PROMETHEUS_URL	Prometheus server URL	Auto-discovery
OPENCOST_URL	OpenCost server URL	Auto-discovery
ELECTRICITY_MAPS_TOKEN	Electricity Maps API token	—
BOAVIZTA_TOKEN	Boavizta API token	—
CLOUD_PROVIDER	aws, gcp, azure, ovh, scaleway	aws
DEFAULT_ZONE	Fallback carbon zone	FR
DEFAULT_INTENSITY	Fallback grid intensity (gCO₂e/kWh)	500.0
LOG_LEVEL	Logging level	INFO
NORMALIZATION_GRANULARITY	hour, day, none	hour
PROMETHEUS_QUERY_RANGE_STEP	Range query step	5m
NODE_ANALYSIS_INTERVAL	Node analysis interval	5m
NODE_DATA_MAX_AGE_DAYS	Max node data age	30
API_HOST	API listen address	0.0.0.0
API_PORT	API listen port	8000
RECOMMENDATION_LOOKBACK_DAYS	Recommendation lookback	7
RIGHTSIZING_CPU_THRESHOLD	CPU rightsizing threshold	0.3
ZOMBIE_COST_THRESHOLD	Zombie detection cost ($)	0.01

Tip

GreenKube works without an Electricity Maps token. When no token is provided, the DEFAULT_INTENSITY value (default: 500 gCO₂e/kWh) is used for all zones. For accurate, zone-specific carbon data, get a free token at electricitymaps.com.