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LIGHTNINGD(8) LIGHTNINGD(8) NAME lightningd -- Daemon for running a Lightning Network node SYNOPSIS lightningd [--conf=<config-file>] [OPTIONS] DESCRIPTION lightningd starts the Core Lightning daemon, which implements a stan- dards-compliant Lightning Network node. CONFIGURATION OPTIONS • --conf=FILE Specify configuration file. If not an absolute path, will be relative from the lightning-dir location. Defaults to con- fig. • --lightning-dir=DIR Set the directory for the Core Lightning daemon. Defaults to $HOME/.lightning. MORE OPTIONS Command line options are mirrored as configuration options in the con- figuration file, so foo in the configuration file simply becomes --foo on the command line, and foo=bar becomes --foo=bar. See lightningd-config(5) for a comprehensive list of all available op- tions. LOGGING AND COMMANDING CORE LIGHTNING By default, Core Lightning will log to the standard output. To log to a specific file, use --log-file=PATH. Sending SIGHUP will cause Core Lightning to reopen this file, for example to do log rotation. Core Lightning will set up a Unix domain socket for receiving commands. By default this will be the file lightning-rpc in your specified light- ning-dir. You can use $ lightning-cli(1) to send commands to Core Lightning once lightningd has started; you need to match the --light- ning-dir and --rpc-file options between them. Commands for Core Lightning are described in various manpages in sec- tion 7, with the common prefix lightning-. QUICK START First, decide on and create a directory for lightning-dir, or just use the default $HOME/.lightning. Then create a config file in this direc- tory containing your configuration. Your other main preparation would be to set up a mainnet Bitcoin fulln- ode, i.e. run a bitcoind(1) instance. The rest of this quick start guide will assume you are reckless and want to spend real funds on Lightning: otherwise indicate network=testnet in your config file ex- plicitly. Core Lightning needs to communicate with the Bitcoin Core RPC. You can set this up using bitcoin-datadir, bitcoin-rpcconnect, bitcoin-rpcport, bitcoin-rpcuser, and bitcoin-rpcpassword options in your config file. Finally, just to keep yourself sane, decide on a log file name and in- dicate it using log-file=lightningd.log in your config file. You might be interested in viewing it periodically as you follow along on this guide. Once the bitcoind instance is running, start lightningd(8): $ lightningd --lightning-dir=$HOME/.lightning --daemon This starts lightningd in the background due to the --daemon option. Check if things are working: $ $ lightning-cli --lightning-dir=$HOME/.lightning help $ $ lightning-cli --lightning-dir=$HOME/.lightning getinfo The getinfo command in particular will return a blockheight field, which indicates the block height to which lightningd has been synchro- nized to (this is separate from the block height that your bitcoind has been synchronized to, and will always lag behind bitcoind). You will have to wait until the blockheight has reached the actual blockheight of the Bitcoin network. Before you can get funds offchain, you need to have some funds onchain owned by lightningd (which has a separate wallet from the bitcoind it connects to). Get an address for lightningd via lightning-newaddr(7) command as below (--lightning-dir option has been elided, specify it if you selected your own lightning-dir): $ $ lightning-cli newaddr This will provide a native SegWit bech32 address. Alternatively you can generate a taproot address with: $ $ lightning-cli newaddr p2tr Transfer a small amount of onchain funds to the given address. Check the status of all your funds (onchain and on-Lightning) via lightning- listfunds(7): $ $ lightning-cli listfunds Now you need to look for an arbitrary Lightning node to connect to, which you can do by using dig(1) and querying lseed.bitcoinstats.com: $ dig lseed.bitcoinstats.com A This will give 25 IPv4 addresses, you can select any one of those. You will also need to learn the corresponding public key, which you can de- termine by searching the IP addrss on <https://1ml.com/> . The public key is a long hex string, like so: 024772ee4fa461febcef09d5869e1238f932861f57be7a6633048514e3f56644a1. (this example public key is not used as of this writing) After determining a public key, use lightning-connect(7) to connect to that public key at that IP: $ $ lightning-cli connect $PUBLICKEY $IP Then open a channel to that node using lightning-fundchannel(7): $ $ lightning-cli fundchannel $PUBLICKEY $SATOSHI This will require that the funding transaction be confirmed before you can send funds over Lightning. To track this, use lightning-list- peers(7) and look at the state of the channel: $ $ lightning-cli listpeers $PUBLICKEY The channel will initially start with a state of CHANNELD_AWAIT- ING_LOCKIN. You need to wait for the channel state to become CHAN- NELD_NORMAL, meaning the funding transaction has been confirmed deeply. Once the channel state is CHANNELD_NORMAL, you can start paying mer- chants over Lightning. Acquire a Lightning invoice from your favorite merchant, and use lightning-pay(7) to pay it: $ $ lightning-cli pay $INVOICE ERRORS CODE • 1: Generic $ lightning-cli error • 10: Error executing subdaemons • 11: Error locking pidfile (often another lightningd running) • 20: Generic error related to HSM secret • 21: HSM secret is encrypted • 22: Bad password used to decrypt the HSM secred • 23: Error caused from the I/O operation during a HSM decryption/en- cryption operation • 30: Wallet database does not match (network or hsm secret) BUGS You should report bugs on our github issues page, and maybe submit a fix to gain our eternal gratitude! AUTHOR ZmnSCPxj <<ZmnSCPxj@protonmail.com>> wrote the initial version of this man page, but many others did the hard work of actually implementing a standards-compliant Lightning Network node implementation. SEE ALSO lightningd-rpc(7), lightning-listconfigs(7), lightningd-config(5), $ lightning-cli(1), lightning-newaddr(7), lightning-listfunds(7), light- ning-connect(7), lightning-fundchannel(7), lightning-listpeers(7), lightning-pay(7), lightning-hsmtool(8) RESOURCES Main web site: <https://github.com/ElementsProject/lightning> COPYING Note: the modules in the ccan/ directory have their own licenses, but the rest of the code is covered by the BSD-style MIT license. Core Lightning v25.02 LIGHTNINGD(8)
NAME | SYNOPSIS | DESCRIPTION | CONFIGURATION OPTIONS | MORE OPTIONS | LOGGING AND COMMANDING CORE LIGHTNING | QUICK START | ERRORS CODE | BUGS | AUTHOR | SEE ALSO | RESOURCES | COPYING
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