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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.

  • 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/.

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

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.
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SCN Configuration File location
Configuration File Format
Properties