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Configure CKB

How CKB Locates Config File

CKB looks for configuration files in <config-dir>, which is the current working directory by default. Different subcommands use different config file names:

  • ckb run: ckb.toml
  • ckb miner: ckb-miner.toml
  • ckb import: ckb.toml
  • ckb export: ckb.toml

Command line argument -C <path> sets the value of <config-dir> to <path>.

Command ckb init initializes a directory by exporting the config files.

Some config file may refer to other files, for example, chain.spec in ckb.toml and system_cells in chain spec file. The file is referred via either absolute path, or a path relative to the directory containing the config file currently being parsed.

Take the following directory hierarchy as an example:

ckb.toml
specs/dev.toml
specs/cells/secp256k1_sighash_all

Then ckb.toml refers dev.toml as specs/dev.toml, while specs/dev.toml refers secp256k1_sighash_all as cells/secp256k1_sighash_all.

How to Change Config

First export the bundled config files into current directory using subcommand init.

ckb init

Then edit the generated config files according to the in-line comments.

Chain Spec

The option chain.spec configures the chain spec, which controls which kind of chain to run. This option is set to Mirana, the mainnet by default.

The subcommand init supports exporting the default options for different chains. The following command lists all supported chains.

ckb init --list-chains

Here is an example to export config files for Pudge, the testnet.

ckb init --chain testnet

Nodes running different chain specs cannot synchronize with each other, so be careful when editing this option.

The dev chain reads the chain spec from file specs/dev.toml, developers can edit to switch between different PoW engines.

CKB now supports the following PoW Engines.

Eaglesong

[pow]
func = "Eaglesong"

Eaglesong with an extra Blake2b Hash

Used for testnet.

[pow]
func = "EaglesongBlake2b"

and the miner workers section in ckb-miner.toml should be:

[[miner.workers]]
worker_type = "EaglesongSimple"
threads     = 1
extra_hash_function = "Blake2b"

Dummy

[pow]
func = "Dummy"

and don't forget to modify ckb-miner.toml miner workers section:

[[miner.workers]]
worker_type = "Dummy"
delay_type  = "Constant"
value       = 5000

How to Run Multiple Nodes

Each node requires its own <config-dir>. Since the default ports will conflict, please export the config files and edit the listen ports in the config files.

The option --genesis-message is required to set to the same message for dev chain, because by default dev chain generates a random genesis message. Nodes with different genesis messages cannot connect to each other.

mkdir node1 node2
ckb -C node1 init --chain dev --genesis-message dev-genesis
ckb -C node2 init --chain dev --genesis-message dev-genesis
# Change listen ports 8114/8115 to 8116/8117 in node2/ckb.toml.
# Change `rpc_url` in node2/ckb.toml to use 8116.
# start node1
ckb -C node1 run
# If you want node2 connects node1, copy the P2P address of node1 in its log.
# Add the address into the section `bootnodes` in `node2/ckb.toml`.
# start node2
ckb -C node2 run