Configuration

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.

CN Configuration File location

• kcnd.conf for configuring the 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/kcn-linux-amd64/conf/.

• For the package distribution, the config directory defaults to /etc/kcnd/conf/.

PN Configuration File location

• kpnd.conf for configuring the Proxy 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/kpn-linux-amd64/conf/.

• For the package distribution, the config directory defaults to /etc/kpnd/conf/.

EN Configuration File location

• kend.conf for configuring the Endpoint 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/ken-linux-amd64/conf/.

• For the package distribution, the config directory defaults to /etc/kend/conf/.

Configuration File Format

CN and PN have the same configuration file format and the properties.

Below is a sample configuration file for the CN that participates in the cypress network and stores the blockchain data in the default location, which is ~/kcnd_home with the archive distribution, /var/kcnd/data with the package distribution.

# Configuration file for the kcnd

# cypress, baobab is only available if you don't specify NETWORK_ID.
NETWORK="cypress"
# 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 CN are as follows.

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

The recommended txpool sizes for PN are as follows.

TXPOOL_EXEC_SLOTS_ALL=8192
TXPOOL_NONEXEC_SLOTS_ALL=8192
TXPOOL_EXEC_SLOTS_ACCOUNT=8192
TXPOOL_NONEXEC_SLOTS_ACCOUNT=8192

The recommended txpool sizes for EN are as follows.

TXPOOL_EXEC_SLOTS_ALL=4096
TXPOOL_NONEXEC_SLOTS_ALL=4096
TXPOOL_EXEC_SLOTS_ACCOUNT=4096
TXPOOL_NONEXEC_SLOTS_ACCOUNT=4096

Properties

The configuration file has the following configurable properties. CN and PN configuration files have the same properties except REWARDBASE.

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 : 5m)
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")
AUTO_RESTART	Restart the process when the current block has not been updated for autorestart.timeout (e.g., 60s, 10m and 1h) 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.