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18_2__Interlude_Accessing_a_Second_Lightning_Node.md
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# Interlude: Accessing a Second Lightning Node # Interlude: Accessing a Second Lightning Node
> :information_source: **NOTE:** This section has been recently added to the course and is an early draft that may still be awaiting review. Caveat reader.
When you played with Bitcoin you were accessing an existing network, and that made it relatively easy to work with: you just turned on `bitcoind` and you were immediately interacting with the network. That's now how Lightning works: it's fundamentally a peer-to-peer network, built up from the connections between any two individual nodes. In other words, to interact with the Lightning Network, you'll need to first find a node to connect to. When you played with Bitcoin you were accessing an existing network, and that made it relatively easy to work with: you just turned on `bitcoind` and you were immediately interacting with the network. That's now how Lightning works: it's fundamentally a peer-to-peer network, built up from the connections between any two individual nodes. In other words, to interact with the Lightning Network, you'll need to first find a node to connect to.
There are four ways to do so (the first three of which are possible for your first connection): There are four ways to do so (the first three of which are possible for your first connection):
## Asking for Information on a Node ## Ask for Information on a Node
If someone else already has a Lightning node on the network of your choice, just ask them for their ID. If someone else already has a Lightning node on the network of your choice, just ask them for their ID.
@ -48,13 +50,13 @@ lightning-cli: WARNING: default network changing in 2020: please set network=tes
``` ```
They can then tell you their `id` (`03240a4878a9a64aea6c3921a434e573845267b86e89ab19003b0c910a86d17687`). They will also need to tell you their IP address (`74.207.240.32`) and port (`9735`). They can then tell you their `id` (`03240a4878a9a64aea6c3921a434e573845267b86e89ab19003b0c910a86d17687`). They will also need to tell you their IP address (`74.207.240.32`) and port (`9735`).
## Creating a New c-lightning Node ## Create a New c-lightning Node
However, for testing purposes, you probably want to have a second node under you own control. The easiest way to do so is to create a second c-lightning node on a new machine, using either Bitcoin Standup, per [§2.1](02_1_Setting_Up_a_Bitcoin-Core_VPS_with_StackScript.md) or compiling it by hand, per [§18.1](18_1_Verifying_Your_Lightning_Setup.md). However, for testing purposes, you probably want to have a second node under you own control. The easiest way to do so is to create a second c-lightning node on a new machine, using either Bitcoin Standup, per [§2.1](02_1_Setting_Up_a_Bitcoin-Core_VPS_with_StackScript.md) or compiling it by hand, per [§18.1](18_1_Verifying_Your_Lightning_Setup.md).
Once you have your node running, you can run `getinfo` to retrieve your information, as shown above. Once you have your node running, you can run `getinfo` to retrieve your information, as shown above.
## Creating a New LND Node ## Create a New LND Node
However, for our examples in the next chapter, we're instead going to create an LND node. This will allow us to demonstrate a bit of the depth of the Lightning ecosystem by showing how similar commands work on the two different platforms. However, for our examples in the next chapter, we're instead going to create an LND node. This will allow us to demonstrate a bit of the depth of the Lightning ecosystem by showing how similar commands work on the two different platforms.
@ -62,7 +64,7 @@ One way to create an LND node is to run the Bitcoin Standup Scripts again on a n
Another is to compile LND from source code on a machine where you'rea already running a Bitcoin node, as follows. Another is to compile LND from source code on a machine where you'rea already running a Bitcoin node, as follows.
### Compiling the LND Source Code ### Compile the LND Source Code
First, you need to download and install Go: First, you need to download and install Go:
``` ```
@ -105,7 +107,7 @@ You should move it to global directories:
$ sudo cp $GOPATH/bin/lnd $GOPATH/bin/lncli /usr/bin $ sudo cp $GOPATH/bin/lnd $GOPATH/bin/lncli /usr/bin
``` ```
### Creating an LND Config File ### Create an LND Config File
Unlike with c-lightning, you will need to create a default config file for LND. Unlike with c-lightning, you will need to create a default config file for LND.
@ -164,7 +166,7 @@ bitcoind.zmqpubrawtx=tcp://127.0.0.1:28333
EOF EOF
``` ```
### Creating an LND Service ### Create an LND Service
Finally, you can create an LND service to automatically run `lnd`: Finally, you can create an LND service to automatically run `lnd`:
``` ```
@ -204,14 +206,14 @@ $ sudo systemctl start lnd
``` ```
(Expect this to take a minute the first time.) (Expect this to take a minute the first time.)
### Enabling Remote Connections ### Enable Remote Connections
Just as with c-lightning, you're going to need to make LND accessible to other nodes. Here's how to do so if you use `ufw`, as per the Bitcoin Standup setups: Just as with c-lightning, you're going to need to make LND accessible to other nodes. Here's how to do so if you use `ufw`, as per the Bitcoin Standup setups:
``` ```
$ sudo ufw allow 9735 $ sudo ufw allow 9735
``` ```
### Creating a Wallet ### Create a Wallet
The first time you run LND, you must create a wallet: The first time you run LND, you must create a wallet:
``` ```
@ -287,7 +289,7 @@ $ lncli --network=testnet getinfo
``` ```
This node's ID is `032a7572dc013b6382cde391d79f292ced27305aa4162ec3906279fc4334602543`. Although this command doesn't show you the IP address and port, they should be the IP address for your machine and port `9735`. This node's ID is `032a7572dc013b6382cde391d79f292ced27305aa4162ec3906279fc4334602543`. Although this command doesn't show you the IP address and port, they should be the IP address for your machine and port `9735`.
## Listening to Gossip ## Listen to Gossip
If you were already connected to the Lightning Network, and were "gossipping" with peers, you might also be able to find information on peers automatically, through the `listpeers` command: If you were already connected to the Lightning Network, and were "gossipping" with peers, you might also be able to find information on peers automatically, through the `listpeers` command:
``` ```