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Version: Next 🚧

beacon CLI Command

Run a beacon chain node

Examples​

Run a beacon chain node and connect to the hoodi testnet

./lodestar beacon --network hoodi

beacon Options​

--dataDir​

Lodestar root data directory

type: string

--network​

Name of the Ethereum Consensus chain network to join

type: string

choices: "mainnet", "gnosis", "sepolia", "hoodi", "chiado", "ephemery", "dev"

default: "mainnet"

--paramsFile​

Network configuration file

type: string

--rcConfig​

RC file to supplement command line args, accepted formats: .yml, .yaml, .json

type: string

--supernode​

Subscribe to and custody all data column sidecar subnets

type: boolean

--semiSupernode​

Subscribe to and custody half of the data column sidecar subnets to support blob reconstruction, enabling more efficient data availability with lower bandwidth and storage requirements compared to a supernode.

type: boolean

--genesisStateFile​

Path or URL to download a genesis state file in ssz-encoded format

type: string

--checkpointSyncUrl​

Server url hosting Beacon Node APIs to fetch weak subjectivity state. Fetch latest finalized by default, else set --wssCheckpoint

type: string

--checkpointState​

File path or url to finalized checkpoint state to start syncing from

type: string

--wssCheckpoint​

Start beacon node off a state at the provided weak subjectivity checkpoint, to be supplied in <blockRoot>:<epoch> format. For example, 0x1234:100 will sync and start off from the weak subjectivity state at checkpoint of epoch 100 with block root 0x1234.

type: string

--forceCheckpointSync​

Force syncing from checkpoint state even if db state is within weak subjectivity period. This helps to avoid long sync times after node has been offline for a while.

type: boolean

--ignoreWeakSubjectivityCheck​

Ignore the checkpoint sync state failing the weak subjectivity check. This is relevant in testnets where the weak subjectivity period is too small for even few epochs of non finalization causing last finalized to be out of range. This flag is not recommended for mainnet use.

type: boolean

--persistNetworkIdentity​

Whether to reuse the same peer-id across restarts. Validator custody requires custody group count to persist relative to a given ENR. Setting to false will reset ENR and validator custody requirements on restarts.

type: boolean

default: true

--private​

Do not send implementation details over p2p identify protocol, and in builder and execution engine requests

type: boolean

--validatorMonitorLogs​

Log validator monitor events as info.

type: boolean

--disableLightClientServer​

Disable light client server.

type: boolean

--logLevel​

Logging verbosity level for emitting logs to terminal

type: string

choices: "error", "warn", "info", "verbose", "debug", "trace"

default: "info"

--logFile​

Path to output all logs to a persistent log file, use 'none' to disable

type: string

--logFileLevel​

Logging verbosity level for emitting logs to file

type: string

choices: "error", "warn", "info", "verbose", "debug", "trace"

default: "debug"

--logFileDailyRotate​

Daily rotate log files, set to an integer to limit the file count, set to 0 (zero) to disable rotation

type: number

default: 5

--rest​

Enable/disable HTTP API

type: boolean

default: true

--rest.namespace​

Pick namespaces to expose for HTTP API. Set to 'all' (or '*') to enable all namespaces

type: string[]

choices: "beacon", "config", "debug", "events", "lightclient", "lodestar", "node", "proof", "validator", "*", "all"

default: ["beacon","config","debug","events","node","validator","lightclient"]

--rest.cors​

Configures the Access-Control-Allow-Origin CORS header for HTTP API. Use 'all' to allow all origins

type: string

default: "*"

--rest.address​

Set host for HTTP API

type: string

default: "127.0.0.1"

--rest.port​

Set port for HTTP API

type: number

default: 9596

--rest.swaggerUI​

Enable Swagger UI for API exploration at http://{address}:{port}/documentation

type: boolean

--suggestedFeeRecipient​

Specify fee recipient default for collecting the EL block fees and rewards (a hex string representing 20 bytes address: ^0x[a-fA-F0-9]{40}$) in case validator fails to update for a validator index before calling produceBlock.

type: string

default: "0x0000000000000000000000000000000000000000"

--emitPayloadAttributes​

Flag to SSE emit execution payloadAttributes before every slot

type: boolean

default: false

--serveHistoricalState​

Enable regenerating finalized state to serve historical data. Fetching this data is expensive and may affect validator performance.

type: boolean

--chain.archiveStateEpochFrequency​

Minimum number of epochs between archived states

type: number

default: 1024

--chain.archiveDataEpochs​

Number of epochs to retain finalized blobs/columns (minimum of MIN_EPOCHS_FOR_BLOB_SIDECARS_REQUESTS/MIN_EPOCHS_FOR_DATA_COLUMN_SIDECARS_REQUESTS)

type: number

--chain.pruneHistory​

Prune historical blocks and state

type: boolean

--execution.urls​

Urls to execution client engine API

type: string[]

default: [ "http://localhost:8551" ]

--execution.timeout​

Timeout in milliseconds for execution engine API HTTP client

type: number

default: 12000

--execution.retries​

Number of retries when calling execution engine API

type: number

default: 2

--execution.retryDelay​

Delay time in milliseconds between retries when retrying calls to the execution engine API

type: number

default: 2000

--execution.engineMock​

Set the execution engine to mock mode (development only)

type: boolean

--jwtSecret​

File path to a shared hex-encoded jwt secret which will be used to generate and bundle HS256 encoded jwt tokens for authentication with the EL client's rpc server hosting engine apis. Secret to be exactly same as the one used by the corresponding EL client.

type: string

--jwtId​

An optional identifier to be set in the id field of the claims included in jwt tokens used for authentication with EL client's rpc server hosting engine apis

type: string

--builder​

Enable external builder

type: boolean

--builder.url​

Url hosting the builder API

type: string

default: "http://localhost:8661"

--builder.timeout​

Timeout in milliseconds for builder API HTTP client

type: number

default: 12000

--builder.faultInspectionWindow​

Window to inspect missed slots for enabling/disabling builder circuit breaker

type: number

--builder.allowedFaults​

Number of missed slots allowed in the faultInspectionWindow for builder circuit

type: number

--metrics​

Enable the Prometheus metrics HTTP server

type: boolean

--metrics.port​

Listen TCP port for the Prometheus metrics HTTP server

type: number

default: 8008

--metrics.address​

Listen address for the Prometheus metrics HTTP server

type: string

default: "127.0.0.1"

--monitoring.endpoint​

Enables monitoring service for sending clients stats to the specified endpoint of a remote service (e.g. beaconcha.in)

type: string

--monitoring.interval​

Interval in milliseconds between sending client stats to the remote service

type: number

default: 60000

--discv5​

Enable discv5

type: boolean

default: true

--listenAddress​

The IPv4 address to listen for p2p UDP and TCP connections

type: string

default: "0.0.0.0"

--port​

The TCP/UDP port to listen on. The UDP port can be modified by the --discoveryPort flag.

type: number

default: 9000

--discoveryPort​

The UDP port that discovery will listen on. Defaults to port

type: number

default: port

--listenAddress6​

The IPv6 address to listen for p2p UDP and TCP connections

type: string

default: "::"

--port6​

The TCP/UDP port to listen on. The UDP port can be modified by the --discoveryPort6 flag.

type: number

default: 9000

--discoveryPort6​

The UDP port that discovery will listen on. Defaults to port6

type: number

default: port6

--bootnodes​

Bootnodes for discv5 discovery

type: string[]

default: [ "[]" ]

--targetPeers​

The target connected peers. Above this number peers will be disconnected

type: number

default: 200

--subscribeAllSubnets​

Subscribe to all subnets regardless of validator count

type: boolean

default: false

--disablePeerScoring​

Disable peer scoring, used for testing on devnets

type: boolean

default: false

--mdns​

Enable mdns local peer discovery

type: boolean

default: false

--directPeers​

Direct peers for GossipSub mesh. These peers maintain permanent connections without GRAFT/PRUNE. Supports multiaddr with peer ID (e.g., /ip4/192.168.1.1/tcp/9000/p2p/16Uiu2HAmKLhW7...) or ENR (e.g., enr:-IS4QHCYrYZbAKWCBRlAy5zzaDZXJBGkcnh4MHcBFZntXNFrdvJjX04jRzjzCBOo...). Both peers must configure each other as direct peers for the feature to work properly.

type: string[]

default: [ "[]" ]

--enr.ip​

Override ENR IP entry

type: string

--enr.tcp​

Override ENR TCP entry

type: number

--enr.udp​

Override ENR UDP entry

type: number

--enr.ip6​

Override ENR IPv6 entry

type: string

--enr.tcp6​

Override ENR (IPv6-specific) TCP entry

type: number

--enr.udp6​

Override ENR (IPv6-specific) UDP entry

type: number

--nat​

Allow configuration of non-local addresses

type: boolean