Configuration Files

This document explains the configurable properties of the node. Klaytn node package ships with good defaults and requires very little configuration. If you changed any settings of a running node, you must restart the node to reflect the changes.

SCN Configuration File location

kscnd.conf for configuring the Service Chain Consensus Node

The configuration file is located in the conf directory, whose default location depends on whether or not the installation is from an archive distribution (tar.gz) or a package distribution (RPM).

For the archive distribution, the config directory location defaults to $INSTALL_PATH/kscn-linux-amd64/conf/.
For the package distribution, the config directory defaults to /etc/kscnd/conf/.

Configuration File Format

Below is a sample configuration file for the SCN that stores the blockchain data in the default location, which is ~/kscnd_home with the archive distribution, /var/kscnd/data with the package distribution.

# Configuration file for the kcnd

NETWORK=
# if you specify NETWORK_ID, a private network is created.
NETWORK_ID=
PORT=32323
SERVER_TYPE="fasthttp"
SYNCMODE="full"
VERBOSITY=3
MAXCONNECTIONS=100
# LDBCACHESIZE=10240
REWARDBASE="0x0"

...

DATA_DIR=
LOG_DIR=$DATA_DIR/logs

The recommended txpool sizes for SCN are as follows.

TXPOOL_EXEC_SLOTS_ALL=16384
TXPOOL_NONEXEC_SLOTS_ALL=16384
TXPOOL_EXEC_SLOTS_ACCOUNT=16384
TXPOOL_NONEXEC_SLOTS_ACCOUNT=16384

Properties

The configuration file has the following configurable properties. SCN, SPN and SEN configuration files have the same properties.

Name	Description
NETWORK	Network name that this node will join. This value is used when NETWORK_ID is not defined. ("cypress", "baobab")
NETWORK_ID	Klaytn network ID. If you create a local private network, you will define the network ID for your own. Following IDs are reserved for pre-configured networks. 8217 : Cypress (Main network) 1000 : Aspen test network 1001 : Baobab test network
PORT	P2P port. (Default: "32323")
SERVER_TYPE	JSON RPC server type. ("http", "fasthttp")
SYNCMODE	Blockchain sync mode. ("fast", "full")
VERBOSITY	Logging verbosity. (0=silent, 1=error, 2=warn, 3=info, 4=debug, 5=detail)
MAXCONNECTIONS	Maximum number of physical connections. All single-channel peers can have up to MAXCONNECTIONS peers. All multi-channel peers can have up to MAXCONNECTIONS/2 peers. Network connection is disabled if it is set to 0. (Default: 10)
LDBCACHESIZE	Size of in-memory cache in LevelDB (MiB). (Default : 768)
REWARDBASE	Account address that will receive block consensus rewards. This property only applies to CN.
TXPOOL_EXEC_SLOTS_ALL	Maximum number of executable transaction slots for all accounts. (Default: 4096)
TXPOOL_NONEXEC_SLOTS_ALL	Maximum number of non-executable transaction slots for all accounts. (Default: 1024)
TXPOOL_EXEC_SLOTS_ACCOUNT	Number of executable transaction slots guaranteed per account. (Default: 16)
TXPOOL_NONEXEC_SLOTS_ACCOUNT	Maximum number of non-executable transaction slots guaranteed per account. (Default: 64)
TXPOOL_LIFE_TIME	Maximum amount of time non-executable transactions is queued. (Default : 30m for SEN, 5m for SCN/SPN)
RPC_ENABLE	Enable the HTTP-RPC server if it is set to 1.
RPC_API	Comma-separated list of APIs offered over the HTTP-RPC interface. (admin, debug, klay, miner, net, personal, rpc, txpool, web3)
RPC_PORT	HTTP-RPC server listening port. (Default: "8551")
RPC_ADDR	HTTP-RPC server listening interface. (Default: "localhost")
RPC_CORSDOMAIN	Comma-separated list of domains from which to accept cross-origin requests (browser enforced)
RPC_VHOSTS	Comma-separated list of virtual hostnames from which to accept requests (server enforced). Accepts '*' wildcard. (Default: {"localhost"})
WS_ENABLE	Enable the WS-RPC server if it is set to 1.
WS_API	APIs offered over the WS-RPC interface. (admin, debug, klay, miner, net, personal, rpc, txpool, web3)
WS_ADDR	WS-RPC server listening interface.
WS_PORT	WS-RPC server listening port. (Default : "8552")
WS_ORIGINS	Origins from which to accept websockets requests. (Default: "localhost")
SC_MAIN_BRIDGE	Enable main bridge service if it is set to 1. Used for service chain configuration.
SC_MAIN_BRIDGE_PORT	Main bridge listens on this port. (Default : "50505")
SC_MAIN_BRIDGE_INDEXING	Enable storing transaction hash of child chain transactions for fast access to child chain data if it is set to 1.
METRICS	Enable metrics collection and reporting if it is set to 1.
PROMETHEUS	Enable prometheus exporter if it is set to 1.
DB_NO_PARALLEL_WRITE	Disable parallel writes of block data to persistent database if it is set to 1.
MULTICHANNEL	Create a dedicated channel for block propagation if it is set to 1.
SUBPORT	Listening sub port number if multichannel option is enabled. (Default : "32324")
NO_DISCOVER	Turn off the discovery option if it is set to 1.
BOOTNODES	Comma-separated kni addresses of bootstrap nodes.
ADDITIONAL	For additional command-line options. e.g) --txpool.nolocals
DATA_DIR	Klaytn blockchain data folder path.
LOG_DIR	Log folder path.

Name

Description

NETWORK

Network name that this node will join. This value is used when NETWORK_ID is not defined. ("cypress", "baobab")

NETWORK_ID

Klaytn network ID. If you create a local private network, you will define the network ID for your own. Following IDs are reserved for pre-configured networks. 8217 : Cypress (Main network) 1000 : Aspen test network 1001 : Baobab test network

PORT

P2P port. (Default: "32323")

SERVER_TYPE

JSON RPC server type. ("http", "fasthttp")

SYNCMODE

Blockchain sync mode. ("fast", "full")

VERBOSITY

Logging verbosity. (0=silent, 1=error, 2=warn, 3=info, 4=debug, 5=detail)

MAXCONNECTIONS

Maximum number of physical connections. All single-channel peers can have up to MAXCONNECTIONS peers. All multi-channel peers can have up to MAXCONNECTIONS/2 peers. Network connection is disabled if it is set to 0. (Default: 10)

LDBCACHESIZE

Size of in-memory cache in LevelDB (MiB). (Default : 768)

REWARDBASE

Account address that will receive block consensus rewards. This property only applies to CN.

TXPOOL_EXEC_SLOTS_ALL

Maximum number of executable transaction slots for all accounts. (Default: 4096)

TXPOOL_NONEXEC_SLOTS_ALL

Maximum number of non-executable transaction slots for all accounts. (Default: 1024)

TXPOOL_EXEC_SLOTS_ACCOUNT

Number of executable transaction slots guaranteed per account. (Default: 16)

TXPOOL_NONEXEC_SLOTS_ACCOUNT

Maximum number of non-executable transaction slots guaranteed per account. (Default: 64)

TXPOOL_LIFE_TIME

Maximum amount of time non-executable transactions is queued. (Default : 30m for SEN, 5m for SCN/SPN)

RPC_ENABLE

Enable the HTTP-RPC server if it is set to 1.

RPC_API

Comma-separated list of APIs offered over the HTTP-RPC interface. (admin, debug, klay, miner, net, personal, rpc, txpool, web3)

RPC_PORT

HTTP-RPC server listening port. (Default: "8551")

RPC_ADDR

HTTP-RPC server listening interface. (Default: "localhost")

RPC_CORSDOMAIN

Comma-separated list of domains from which to accept cross-origin requests (browser enforced)

RPC_VHOSTS

Comma-separated list of virtual hostnames from which to accept requests (server enforced). Accepts '*' wildcard. (Default: {"localhost"})

WS_ENABLE

Enable the WS-RPC server if it is set to 1.

WS_API

APIs offered over the WS-RPC interface. (admin, debug, klay, miner, net, personal, rpc, txpool, web3)

WS_ADDR

WS-RPC server listening interface.

WS_PORT

WS-RPC server listening port. (Default : "8552")

WS_ORIGINS

Origins from which to accept websockets requests. (Default: "localhost")

SC_MAIN_BRIDGE

Enable main bridge service if it is set to 1. Used for service chain configuration.

SC_MAIN_BRIDGE_PORT

Main bridge listens on this port. (Default : "50505")

SC_MAIN_BRIDGE_INDEXING

Enable storing transaction hash of child chain transactions for fast access to child chain data if it is set to 1.

METRICS

Enable metrics collection and reporting if it is set to 1.

PROMETHEUS

Enable prometheus exporter if it is set to 1.

DB_NO_PARALLEL_WRITE

Disable parallel writes of block data to persistent database if it is set to 1.

MULTICHANNEL

Create a dedicated channel for block propagation if it is set to 1.

SUBPORT

Listening sub port number if multichannel option is enabled. (Default : "32324")

NO_DISCOVER

Turn off the discovery option if it is set to 1.

BOOTNODES

Comma-separated kni addresses of bootstrap nodes.

ADDITIONAL

For additional command-line options. e.g) --txpool.nolocals

DATA_DIR

Klaytn blockchain data folder path.

LOG_DIR

Log folder path.

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