Configuration Reference

Complete reference for Engine, Control, and Ledger configuration.

Engine Configuration

Precedence (highest first): environment variables (INFERADB__ENGINE__*) > YAML config (--config) > CLI flags.

Engine Settings

Key	Env Var	Default	Description
threads	INFERADB__ENGINE__THREADS	CPU count	Worker thread count
logging	INFERADB__ENGINE__LOGGING	info	Log level (trace, debug, info, warn, error)
listen.http	INFERADB__ENGINE__LISTEN__HTTP	0.0.0.0:8080	HTTP listen address
listen.grpc	INFERADB__ENGINE__LISTEN__GRPC	0.0.0.0:8081	gRPC listen address
listen.mesh	INFERADB__ENGINE__LISTEN__MESH	0.0.0.0:8082	Mesh/internal listen address
storage	INFERADB__ENGINE__STORAGE	memory	Storage backend (memory or ledger)
ledger.endpoint	INFERADB__ENGINE__LEDGER__ENDPOINT	—	Ledger gRPC endpoint
ledger.client_id	INFERADB__ENGINE__LEDGER__CLIENT_ID	—	Client ID for Ledger authentication
ledger.namespace_id	INFERADB__ENGINE__LEDGER__NAMESPACE_ID	—	Namespace ID for multi-tenant Ledger
cache.enabled	INFERADB__ENGINE__CACHE__ENABLED	true	Enable evaluation and relationship cache
cache.capacity	INFERADB__ENGINE__CACHE__CAPACITY	100000	Maximum cache entries
cache.ttl	INFERADB__ENGINE__CACHE__TTL	300	Cache TTL in seconds
token.cache_ttl	INFERADB__ENGINE__TOKEN__CACHE_TTL	300	Token validation cache TTL in seconds
token.clock_skew	INFERADB__ENGINE__TOKEN__CLOCK_SKEW	30	Allowed clock skew for token validation (seconds)
token.max_age	INFERADB__ENGINE__TOKEN__MAX_AGE	3600	Maximum token age in seconds
pem	INFERADB__ENGINE__PEM	—	Path to PEM file for token signing/verification
discovery.mode	INFERADB__ENGINE__DISCOVERY__MODE	none	Peer discovery mode (none, kubernetes, tailscale)
mesh.url	INFERADB__ENGINE__MESH__URL	—	Mesh endpoint URL for peer communication
mesh.timeout	INFERADB__ENGINE__MESH__TIMEOUT	5000	Mesh request timeout in milliseconds
mesh.cache_ttl	INFERADB__ENGINE__MESH__CACHE_TTL	60	Mesh peer list cache TTL in seconds
auth.enabled	INFERADB__ENGINE__AUTH__ENABLED	true	Enable request authentication
auth.replay_protection	INFERADB__ENGINE__AUTH__REPLAY_PROTECTION	true	Enable JTI-based replay protection

Example YAML Configuration

threads: 4
logging: info

listen:
  http: "0.0.0.0:8080"
  grpc: "0.0.0.0:8081"
  mesh: "0.0.0.0:8082"

storage: ledger
ledger:
  endpoint: "http://ledger:50051"
  client_id: "engine-01"

cache:
  enabled: true
  capacity: 100000
  ttl: 300

token:
  cache_ttl: 300
  clock_skew: 30
  max_age: 3600

pem: "/etc/inferadb/signing.pem"

discovery:
  mode: kubernetes

auth:
  enabled: true
  replay_protection: true

Validate Configuration

inferadb-engine --config config.yaml --validate

Control Configuration

The Control service is configured via CLI flags:

Flag	Default	Description
--listen	0.0.0.0:9090	HTTP listen address
--storage	memory	Storage backend (memory or ledger)
--dev-mode	false	Enable development mode (relaxed security)
--key-file	—	Path to Ed25519 signing key
--ledger-endpoint	—	Ledger gRPC endpoint
--frontend-url	http://localhost:3000	Dashboard URL (for CORS and redirects)
--log-level	info	Log level

Example

inferadb-control \
  --listen 0.0.0.0:9090 \
  --storage ledger \
  --ledger-endpoint http://ledger:50051 \
  --key-file /etc/inferadb/control.key \
  --frontend-url https://dashboard.example.com \
  --log-level info

Ledger Configuration

The Ledger is configured via CLI flags:

Flag	Default	Description
--listen	0.0.0.0:50051	gRPC listen address
--data	./data	Data directory for B+ tree storage
--single	—	Run as a single-node cluster (no quorum)
--join	—	Join an existing cluster at the given address
--cluster N	—	Bootstrap a new cluster with N initial nodes
--peers	—	Comma-separated list of peer addresses
--region	—	Region identifier for data residency
--metrics	—	Metrics listen address (Prometheus)

Single-Node (Development)

inferadb-ledger --single --data /var/lib/inferadb

Three-Node Cluster

# Node 1 (bootstrap)
inferadb-ledger --cluster 3 --data /data --listen 0.0.0.0:50051 \
  --peers node2:50051,node3:50051

# Node 2
inferadb-ledger --join node1:50051 --data /data --listen 0.0.0.0:50051

# Node 3
inferadb-ledger --join node1:50051 --data /data --listen 0.0.0.0:50051

Multi-Region

# US East node
inferadb-ledger --region us-east-1 --cluster 3 --data /data \
  --peers node2:50051,node3:50051

# EU West node
inferadb-ledger --region eu-west-1 --cluster 3 --data /data \
  --peers eu-node2:50051,eu-node3:50051

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