Command line options allow you to customize the way your beacon node operates.
You pass options to the beacon node by adding them to the command line.
For example, if you want to launch Nimbus on mainnet with different base ports than the default
To see the full list of command line options available to you, with descriptions, run:
You should see the following output:
Usage: nimbus_beacon_node [OPTIONS]... command The following options are available: --config-file Loads the configuration from a TOML file. --log-level Sets the log level for process and topics (e.g. "DEBUG; TRACE:discv5,libp2p; REQUIRED:none; DISABLED:none") [=INFO]. --log-file Specifies a path for the written JSON log file (deprecated). --network The Eth2 network to join [=mainnet]. -d, --data-dir The directory where nimbus will store all blockchain data. --validators-dir A directory containing validator keystores. --verifying-web3-signer-url Remote Web3Signer URL that will be used as a source of validators. --proven-block-property The field path of a block property that will be sent for verification to the verifying Web3Signer (for example ".execution_payload.fee_recipient"). --web3-signer-url Remote Web3Signer URL that will be used as a source of validators. --web3-signer-update-interval Number of seconds between validator list updates [=3600]. --secrets-dir A directory containing validator keystore passwords. --wallets-dir A directory containing wallet files. --web3-url One or more execution layer Engine API URLs. --el One or more execution layer Engine API URLs. --no-el Don't use an EL. The node will remain optimistically synced and won't be able to perform validator duties [=false]. --non-interactive Do not display interactive prompts. Quit on missing configuration. --netkey-file Source of network (secp256k1) private key file (random|<path>) [=random]. --insecure-netkey-password Use pre-generated INSECURE password for network private key file [=false]. --agent-string Node agent string which is used as identifier in network [=nimbus]. --subscribe-all-subnets Subscribe to all subnet topics when gossiping [=false]. --num-threads Number of worker threads ("0" = use as many threads as there are CPU cores available) [=0]. --jwt-secret A file containing the hex-encoded 256 bit secret key to be used for verifying/generating JWT tokens. -b, --bootstrap-node Specifies one or more bootstrap nodes to use when connecting to the network. --bootstrap-file Specifies a line-delimited file of bootstrap Ethereum network addresses. --listen-address Listening address for the Ethereum LibP2P and Discovery v5 traffic [=0.0.0.0]. --tcp-port Listening TCP port for Ethereum LibP2P traffic [=9000]. --udp-port Listening UDP port for node discovery [=9000]. --max-peers The target number of peers to connect to [=160]. --hard-max-peers The maximum number of peers to connect to. Defaults to maxPeers * 1.5. --nat Specify method to use for determining public address. Must be one of: any, none, upnp, pmp, extip:<IP> [=any]. --enr-auto-update Discovery can automatically update its ENR with the IP address and UDP port as seen by other nodes it communicates with. This option allows to enable/disable this functionality [=false]. --weak-subjectivity-checkpoint Weak subjectivity checkpoint in the format block_root:epoch_number. --external-beacon-api-url External beacon API to use for syncing (on empty database). --sync-light-client Accelerate sync using light client [=true]. --trusted-block-root Recent trusted finalized block root to sync from external beacon API (with `--external-beacon-api-url`). Uses the light client sync protocol to obtain the latest finalized checkpoint (LC is initialized from trusted block root). --trusted-state-root Recent trusted finalized state root to sync from external beacon API (with `--external-beacon-api-url`). --finalized-checkpoint-state SSZ file specifying a recent finalized state. --genesis-state SSZ file specifying the genesis state of the network (for networks without a built-in genesis state). --genesis-state-url URL for obtaining the genesis state of the network (for networks without a built-in genesis state). --finalized-deposit-tree-snapshot SSZ file specifying a recent finalized EIP-4881 deposit tree snapshot. --node-name A name for this node that will appear in the logs. If you set this to 'auto', a persistent automatically generated ID will be selected for each --data-dir folder. --graffiti The graffiti value that will appear in proposed blocks. You can use a 0x-prefixed hex encoded string to specify raw bytes. --metrics Enable the metrics server [=false]. --metrics-address Listening address of the metrics server [=127.0.0.1]. --metrics-port Listening HTTP port of the metrics server [=8008]. --status-bar Display a status bar at the bottom of the terminal screen [=true]. --status-bar-contents Textual template for the contents of the status bar. --rest Enable the REST server [=false]. --rest-port Port for the REST server [=5052]. --rest-address Listening address of the REST server [=127.0.0.1]. --rest-allow-origin Limit the access to the REST API to a particular hostname (for CORS-enabled clients such as browsers). --rest-statecache-size The maximum number of recently accessed states that are kept in memory. Speeds up requests obtaining information for consecutive slots or epochs. [=3]. --rest-statecache-ttl The number of seconds to keep recently accessed states in memory [=60]. --rest-request-timeout The number of seconds to wait until complete REST request will be received [=infinite]. --rest-max-body-size Maximum size of REST request body (kilobytes) [=16384]. --rest-max-headers-size Maximum size of REST request headers (kilobytes) [=128]. --keymanager Enable the REST keymanager API [=false]. --keymanager-port Listening port for the REST keymanager API [=5052]. --keymanager-address Listening port for the REST keymanager API [=127.0.0.1]. --keymanager-allow-origin Limit the access to the Keymanager API to a particular hostname (for CORS-enabled clients such as browsers). --keymanager-token-file A file specifying the authorization token required for accessing the keymanager API. --light-client-data-serve Serve data for enabling light clients to stay in sync with the network [=true]. --light-client-data-import-mode Which classes of light client data to import. Must be one of: none, only-new, full (slow startup), on-demand (may miss validator duties) [=only-new]. --light-client-data-max-periods Maximum number of sync committee periods to retain light client data. --in-process-validators Disable the push model (the beacon node tells a signing process with the private keys of the validators what to sign and when) and load the validators in the beacon node itself [=true]. --discv5 Enable Discovery v5 [=true]. --dump Write SSZ dumps of blocks, attestations and states to data dir [=false]. --direct-peer The list of privileged, secure and known peers to connect and maintain the connection to. This requires a not random netkey-file. In the multiaddress format like: /ip4/<address>/tcp/<port>/p2p/<peerId-public-key>, or enr format (enr:-xx). Peering agreements are established out of band and must be reciprocal. --doppelganger-detection If enabled, the beacon node prudently listens for 2 epochs for attestations from a validator with the same index (a doppelganger), before sending an attestation itself. This protects against slashing (due to double-voting) but means you will miss two attestations when restarting. [=true]. --validator-monitor-auto Monitor validator activity automatically for validators active on this beacon node [=true]. --validator-monitor-pubkey One or more validators to monitor - works best when --subscribe-all-subnets is enabled. --validator-monitor-details Publish detailed metrics for each validator individually - may incur significant overhead with large numbers of validators [=false]. --suggested-fee-recipient Suggested fee recipient. --suggested-gas-limit Suggested gas limit [=defaultGasLimit]. --payload-builder Enable external payload builder [=false]. --payload-builder-url Payload builder URL. --local-block-value-boost Increase execution layer block values for builder bid comparison by a percentage [=0]. --history Retention strategy for historical data (archive/prune) [=HistoryMode.Prune]. ...
debug-prefixed flags are considered ephemeral and subject to removal without notice.
All command line options can also be provided in a TOML
config file specified through the
Within the config file, you need to use the long names of all options.
Please note that certain options
can be supplied more than once on the command line: in the TOML file, you need
to supply them as arrays.
There are also some minor differences in the parsing
of certain option values in the TOML files in order to conform more closely to
existing TOML standards.
For example, you can freely use keywords such as
no on the command-line as synonyms for the canonical values
false which are mandatory to use in TOML. Options affecting Nimbus
sub-commands should appear in a section of the file matching the sub-command name.
Here is an example config file illustrating all of the above:
|1||Generic failure or unspecified error|
|129||Doppelganger detection; one might prefer not to restart automatically|