335 lines
12 KiB
Markdown
335 lines
12 KiB
Markdown
This document is written for people who are eager to do something with
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the Lightning Network Daemon (`lnd`). This folder uses `docker-compose` to
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package `lnd` and `btcd` together to make deploying the two daemons as easy as
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typing a few commands. All configuration between `lnd` and `btcd` are handled
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automatically by their `docker-compose` config file.
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### Prerequisites
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Name | Version
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--------|---------
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docker-compose | 1.9.0
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docker | 1.13.0
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### Table of content
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* [Create lightning network cluster](#create-lightning-network-cluster)
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* [Connect to faucet lightning node](#connect-to-faucet-lightning-node)
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* [Questions](#questions)
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### Create lightning network cluster
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This section describes a workflow on `simnet`, a development/test network
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that's similar to Bitcoin Core's `regtest` mode. In `simnet` mode blocks can be
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generated at will, as the difficulty is very low. This makes it an ideal
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environment for testing as one doesn't need to wait tens of minutes for blocks
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to arrive in order to test channel related functionality. Additionally, it's
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possible to spin up an arbitrary number of `lnd` instances within containers to
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create a mini development cluster. All state is saved between instances using a
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shared value.
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Current workflow is big because we recreate the whole network by ourselves,
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next versions will use the started `btcd` bitcoin node in `testnet` and
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`faucet` wallet from which you will get the bitcoins.
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In the workflow below, we describe the steps required to recreate the following
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topology, and send a payment from `Alice` to `Bob`.
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```
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+ ----- + + --- +
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| Alice | <--- channel ---> | Bob | <--- Bob and Alice are the lightning network daemons which
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+ ----- + + --- + create channels and interact with each other using the
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| | Bitcoin network as source of truth.
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| |
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+ - - - - - + - - - - - - +
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+ --------------- +
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| Bitcoin network | <--- In the current scenario for simplicity we create only one
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+ --------------- + "btcd" node which represents the Bitcoin network, in a
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real situation Alice and Bob will likely be
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connected to different Bitcoin nodes.
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```
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**General workflow is the following:**
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* Create a `btcd` node running on a private `simnet`.
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* Create `Alice`, one of the `lnd` nodes in our simulation network.
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* Create `Bob`, the other `lnd` node in our simulation network.
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* Mine some blocks to send `Alice` some bitcoins.
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* Open channel between `Alice` and `Bob`.
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* Send payment from `Alice` to `Bob`.
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* Close the channel between `Alice` and `Bob`.
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* Check that on-chain `Bob` balance was changed.
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Start `btcd`, and then create an address for `Alice` that we'll directly mine
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bitcoin into.
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```bash
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# Init bitcoin network env variable:
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$ export NETWORK="simnet"
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# Create persistent volumes for alice and bob.
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docker volume create simnet_lnd_alice
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docker volume create simnet_lnd_bob
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# Run the "Alice" container and log into it:
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$ docker-compose run -d --name alice --volume simnet_lnd_alice:/root/.lnd lnd_btc
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$ docker exec -i -t alice bash
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# Generate a new backward compatible nested p2sh address for Alice:
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alice$ lncli --network=simnet newaddress np2wkh
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# Recreate "btcd" node and set Alice's address as mining address:
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$ MINING_ADDRESS=<alice_address> docker-compose up -d btcd
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# Generate 400 blocks (we need at least "100 >=" blocks because of coinbase
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# block maturity and "300 ~=" in order to activate segwit):
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$ docker-compose run btcctl generate 400
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# Check that segwit is active:
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$ docker-compose run btcctl getblockchaininfo | grep -A 1 segwit
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```
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Check `Alice` balance:
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```
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alice$ lncli --network=simnet walletbalance
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```
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Connect `Bob` node to `Alice` node.
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```bash
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# Run "Bob" node and log into it:
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$ docker-compose run -d --name bob --volume simnet_lnd_bob:/root/.lnd lnd_btc
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$ docker exec -i -t bob bash
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# Get the identity pubkey of "Bob" node:
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bob$ lncli --network=simnet getinfo
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{
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----->"identity_pubkey": "0343bc80b914aebf8e50eb0b8e445fc79b9e6e8e5e018fa8c5f85c7d429c117b38",
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"alias": "",
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"num_pending_channels": 0,
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"num_active_channels": 0,
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"num_inactive_channels": 0,
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"num_peers": 0,
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"block_height": 1215,
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"block_hash": "7d0bc86ea4151ed3b5be908ea883d2ac3073263537bcf8ca2dca4bec22e79d50",
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"synced_to_chain": true,
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"testnet": false
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"chains": [
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"bitcoin"
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]
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}
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# Get the IP address of "Bob" node:
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$ docker inspect bob | grep IPAddress
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# Connect "Alice" to the "Bob" node:
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alice$ lncli --network=simnet connect <bob_pubkey>@<bob_host>
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# Check list of peers on "Alice" side:
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alice$ lncli --network=simnet listpeers
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{
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"peers": [
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{
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"pub_key": "0343bc80b914aebf8e50eb0b8e445fc79b9e6e8e5e018fa8c5f85c7d429c117b38",
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"address": "172.19.0.4:9735",
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"bytes_sent": "357",
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"bytes_recv": "357",
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"sat_sent": "0",
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"sat_recv": "0",
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"inbound": true,
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"ping_time": "0"
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}
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]
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}
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# Check list of peers on "Bob" side:
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bob$ lncli --network=simnet listpeers
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{
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"peers": [
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{
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"pub_key": "03d0cd35b761f789983f3cfe82c68170cd1c3266b39220c24f7dd72ef4be0883eb",
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"address": "172.19.0.3:51932",
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"bytes_sent": "357",
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"bytes_recv": "357",
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"sat_sent": "0",
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"sat_recv": "0",
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"inbound": false,
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"ping_time": "0"
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}
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]
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}
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```
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Create the `Alice<->Bob` channel.
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```bash
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# Open the channel with "Bob":
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alice$ lncli --network=simnet openchannel --node_key=<bob_identity_pubkey> --local_amt=1000000
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# Include funding transaction in block thereby opening the channel:
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$ docker-compose run btcctl generate 3
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# Check that channel with "Bob" was opened:
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alice$ lncli --network=simnet listchannels
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{
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"channels": [
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{
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"active": true,
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"remote_pubkey": "0343bc80b914aebf8e50eb0b8e445fc79b9e6e8e5e018fa8c5f85c7d429c117b38",
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"channel_point": "3511ae8a52c97d957eaf65f828504e68d0991f0276adff94c6ba91c7f6cd4275:0",
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"chan_id": "1337006139441152",
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"capacity": "1005000",
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"local_balance": "1000000",
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"remote_balance": "0",
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"commit_fee": "8688",
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"commit_weight": "600",
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"fee_per_kw": "12000",
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"unsettled_balance": "0",
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"total_satoshis_sent": "0",
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"total_satoshis_received": "0",
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"num_updates": "0",
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"pending_htlcs": [
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],
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"csv_delay": 4
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}
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]
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}
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```
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Send the payment from `Alice` to `Bob`.
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```bash
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# Add invoice on "Bob" side:
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bob$ lncli --network=simnet addinvoice --amt=10000
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{
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"r_hash": "<your_random_rhash_here>",
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"pay_req": "<encoded_invoice>",
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}
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# Send payment from "Alice" to "Bob":
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alice$ lncli --network=simnet sendpayment --pay_req=<encoded_invoice>
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# Check "Alice"'s channel balance
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alice$ lncli --network=simnet channelbalance
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# Check "Bob"'s channel balance
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bob$ lncli --network=simnet channelbalance
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```
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Now we have open channel in which we sent only one payment, let's imagine
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that we sent lots of them and we'd now like to close the channel. Let's do
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it!
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```bash
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# List the "Alice" channel and retrieve "channel_point" which represents
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# the opened channel:
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alice$ lncli --network=simnet listchannels
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{
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"channels": [
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{
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"active": true,
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"remote_pubkey": "0343bc80b914aebf8e50eb0b8e445fc79b9e6e8e5e018fa8c5f85c7d429c117b38",
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---->"channel_point": "3511ae8a52c97d957eaf65f828504e68d0991f0276adff94c6ba91c7f6cd4275:0",
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"chan_id": "1337006139441152",
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"capacity": "1005000",
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"local_balance": "990000",
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"remote_balance": "10000",
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"commit_fee": "8688",
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"commit_weight": "724",
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"fee_per_kw": "12000",
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"unsettled_balance": "0",
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"total_satoshis_sent": "10000",
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"total_satoshis_received": "0",
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"num_updates": "2",
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"pending_htlcs": [
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],
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"csv_delay": 4
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}
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]
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}
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# Channel point consists of two numbers separated by a colon. The first one
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# is "funding_txid" and the second one is "output_index":
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alice$ lncli --network=simnet closechannel --funding_txid=<funding_txid> --output_index=<output_index>
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# Include close transaction in a block thereby closing the channel:
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$ docker-compose run btcctl generate 3
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# Check "Alice" on-chain balance was credited by her settled amount in the channel:
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alice$ lncli --network=simnet walletbalance
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# Check "Bob" on-chain balance was credited with the funds he received in the
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# channel:
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bob$ lncli --network=simnet walletbalance
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{
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"total_balance": "10000",
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"confirmed_balance": "10000",
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"unconfirmed_balance": "0"
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}
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```
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### Connect to faucet lightning node
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In order to be more confident with `lnd` commands I suggest you to try
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to create a mini lightning network cluster ([Create lightning network cluster](#create-lightning-network-cluster)).
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In this section we will try to connect our node to the faucet/hub node
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which we will create a channel with and send some amount of
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bitcoins. The schema will be following:
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```
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+ ----- + + ------ + (1) + --- +
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| Alice | <--- channel ---> | Faucet | <--- channel ---> | Bob |
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+ ----- + + ------ + + --- +
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| | |
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| | | <--- (2)
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+ - - - - - - - - - - - - - + - - - - - - - - - - - - - +
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+ --------------- +
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| Bitcoin network | <--- (3)
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+ --------------- +
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(1) You may connect an additional node "Bob" and make the multihop
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payment Alice->Faucet->Bob
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(2) "Faucet", "Alice" and "Bob" are the lightning network daemons which
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create channels to interact with each other using the Bitcoin network
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as source of truth.
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(3) In current scenario "Alice" and "Faucet" lightning network nodes
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connect to different Bitcoin nodes. If you decide to connect "Bob"
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to "Faucet" then the already created "btcd" node would be sufficient.
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```
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First of all you need to run `btcd` node in `testnet` and wait for it to be
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synced with test network (`May the Force and Patience be with you`).
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```bash
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# Init bitcoin network env variable:
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$ export NETWORK="testnet"
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# Run "btcd" node:
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$ docker-compose up -d "btcd"
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```
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After `btcd` synced, connect `Alice` to the `Faucet` node.
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The `Faucet` node address can be found at the [Faucet Lightning Community webpage](https://faucet.lightning.community).
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```bash
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# Run "Alice" container and log into it:
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$ docker-compose run -d --name alice lnd_btc; docker exec -i -t "alice" bash
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# Connect "Alice" to the "Faucet" node:
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alice$ lncli --network=testnet connect <faucet_identity_address>@<faucet_host>
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```
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After a connection is achieved, the `Faucet` node should create the channel
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and send some amount of bitcoins to `Alice`.
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**What you may do next?:**
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- Send some amount to `Faucet` node back.
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- Connect `Bob` node to the `Faucet` and make multihop payment (`Alice->Faucet->Bob`)
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- Close channel with `Faucet` and check the onchain balance.
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### Questions
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[](https://webchat.freenode.net/?channels=lnd)
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* How to see `alice` | `bob` | `btcd` logs?
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```bash
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docker-compose logs <alice|bob|btcd>
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```
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