Deploying a local network

Get ready to spin up a bunch of different terminals. We are going to run 3 nodes: Alice and Bob and our seed node. To run the seed node, go to the lilith directory and spawn a new config file by running it once:

cd darkfi
make BINS=lilith
./lilith


You should see the following output:

Config file created in '"/home/USER/.config/darkfi/lilith_config.toml"'. Please review it and try again.


Add dchat to the config as follows, keeping in mind that the port number must match the seed we specified earlier in Alice and Bob's settings.

[network."dchat"]
port = 50515
localnet = true


Now run lilith:

./lilith


Here's what the debug output should look like:

[INFO] Found configuration for network: dchat
[INFO] Starting seed network node for dchat at: tcp://127.0.0.1:50515
[WARN] Skipping seed sync process since no seeds are configured.
[INFO] Starting inbound session on tcp://127.0.0.1:50515
[INFO] Starting 0 outbound connection slots.


Next we'll head back to dchat and run Alice.

cargo run a


You can cat or tail the log file created in /tmp/. I recommend using multitail for colored debug output, like so:

multitail -c /tmp/alice.log


Check out that debug output! Keep an eye out for this line:

[INFO] Connected seed #0 [tcp://127.0.0.1:55555]


That shows Alice has connected to the seed node. Here's some more interesting output:

[DEBUG] (1) net: Attached ProtocolPing
[DEBUG] (1) net: Attached ProtocolSeed
[DEBUG] (1) net: ProtocolVersion::run() [START]
[DEBUG] (1) net: ProtocolVersion::exchange_versions() [START]


This raises an interesting question- what are these protocols? We'll deal with that in more detail in a subsequent section. For now it's worth noting that every node on the p2p network performs several protocols when it connects to another node.

Keep Alice and the seed node running. Now let's run Bob.

cargo run b


And track his debug output:

multitail -c /tmp/bob.log


Success! All going well, Alice and Bob are now connected to each other. We should be able to watch ping and pong messages being sent across by tracking their debug output.

We have created a local deployment of the p2p network.