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run-node.md

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Running a node

The following commands assume that the babylond executable has been installed. If the repository was only built, then ./build/babylond should be used in its place.

Generating the node configuration

The configuration for a single node can be created through the testnet command. While the testnet command can create an arbitrary number of nodes that communicate on a testnet, here we focus on the setup of a single node.

babylond testnet \
    --v                     1 \
    --output-dir            ./.testnet \
    --starting-ip-address   192.168.10.2 \
    --keyring-backend       test \
    --chain-id              chain-test

The flags specify the following:

  • --output-dir <testnet-dir>: Specifies that the testnet files should reside under this directory.
  • --v <N>: Leads to the creation of N nodes, each one residing under the <testnet-dir>/node{i}. In this case i={0..N-1}.
  • --starting-ip-address <ip>: Specifies the IP address for the nodes. For example, 192.168.10.2 leads to the first node running on 192.168.10.2:46656, the second one on 192.168.10.3:46656 etc.
  • --keyring-backend {os,file,test}: Specifies the backend to use for the keyring. Available choices include os, file, and test. We use test for convenience.
  • --chain-id: An identifier for the chain. Useful when perrforming operations later.

In this case, we generated a single node. If we take a look under .testnet:

$ ls .testnet
gentxs node0

The gentxs directory contains the genesis transactions. It contains transactions that assign bbn tokens to a single address that is defined for each node.

The node0 directory contains the the following,

$ ls .testnet/node0/babylond
config        data          key_seed.json keyring-test

A brief description of the contents:

  • config: Contains the configuration files for the node.
  • data: Contains the database storage for the node.
  • key_seed.json: Seed to generate the keys maintained by the keyring.
  • keyring-test: Contains the test keyring. This directory was created because we provided the --keyring-backend test flag. The testnet command, creates a validator node named node{i} (depends on the node name), and assigns bbn tokens to it through a transaction written to .testnet/gentxs/node{i}.json. The keys for this node can be pointed to by the node{i} name.

Running the node

babylond start --home ./.testnet/node0/babylond

Logs

The logs for a particular node can be found under .testnets/node{id}/babylond/babylond.log.

Performing queries

After building a node and starting it, you can perform queries.

babylond --home .testnet/node{i}/babylond/ --chain-id <chain-id> \
    query <module-name> <query-name>

For example, in order to get the hashes maintained by the btcligthclient module:

$ babylond --home .testnet/node0/babylond/ --chain-id chain-test query btclightclient hashes

hashes:
- 00000000000000000002bf1c218853bc920f41f74491e6c92c6bc6fdc881ab47
pagination:
  next_key: null
  total: "1"

Submitting transactions

After building a node and running it, one can send transactions as follows:

babylond --home .testnet/node{i}/babylond --chain-id <chain-id> \
         --keyring-backend {os,file,test} --fees <amount><denom> \
         --from <key-name> --broadcast-mode {sync,async,block} \
         tx <module-name> <tx-name> [data]

The --fees flag specifies the amount of fees that we are willing to pay and the denomination and the --from flag denotes the name of the key that we want to use to sign the transaction (i.e. from which account we want this transaction to happen). The --broadcast-mode specifies how long we want to wait until we receive a response from the CLI: async means immediately, sync means after the transaction has been validated through CheckTx, and block means after the transaction has been processed by the next block.

For example, in the btclightclient module, in order to submit a header, one should:

babylond --home .testnet/node0/babylond --chain-id chain-test \
         --keyring-backend test --fees 100bbn \
         --from node0 --broadcast-mode block \
         tx btclightclient insert-header <header-hex>

Running a multi-node testnet

We provide support for running a multi-node testnet using Docker. To build it

make localnet-start

The corresponding node directories can be found under .testnets

$ ls .testnets
gentxs node0 node1 node2 node3

Testing

make test