Run a Node

Configure and run an Kynno node {synopsis}

Pre-requisite Readings

Automated deployment

Run the local node by running the script in the base directory of the repository.

::: warning The script below will remove any pre-existing binaries installed. Use the manual deploy if you want to keep your binaries and configuration files. :::


Manual deployment

The instructions for setting up a brand new full node from scratch are the the same as running a single node local testnet.

Start node

To start your node, just type:

kynnod start --json-rpc.enable=true --json-rpc.api="eth,web3,net"

Key Management

To run a node with the same key every time: replace kynnod keys add $KEY in ./ with:

echo "your mnemonic here" | kynnod keys add $KEY --recover

::: tip Kynno currently only supports 24 word mnemonics. :::

You can generate a new key/mnemonic with:

kynnod keys add $KEY

To export your kynno private key as an Ethereum private key (for use with Metamask for example):

kynnod keys unsafe-export-eth-key $KEY

For more about the available key commands, use the --help flag

kynnod keys -h

Keyring backend options

The instructions above include commands to use test as the keyring-backend. This is an unsecured keyring that doesn't require entering a password and should not be used in production. Otherwise, Kynno supports using a file or OS keyring backend for key storage. To create and use a file stored key instead of defaulting to the OS keyring, add the flag --keyring-backend file to any relevant command and the password prompt will occur through the command line. This can also be saved as a CLI config option with:

kynnod config keyring-backend file

:::tip For more information about the Keyring and its backend options, click here. :::

Clearing data from chain

Reset Data

Alternatively, you can reset the blockchain database, remove the node's address book files, and reset the priv_validator.json to the genesis state.

::: danger If you are running a validator node, always be careful when doing kynnod unsafe-reset-all. You should never use this command if you are not switching chain-id. :::

::: danger IMPORTANT: Make sure that every node has a unique priv_validator.json. Do not copy the priv_validator.json from an old node to multiple new nodes. Running two nodes with the same priv_validator.json will cause you to double sign! :::

First, remove the outdated files and reset the data.

rm $HOME/.kynnod/config/addrbook.json $HOME/.kynnod/config/genesis.json
kynnod tendermint unsafe-reset-all --home $HOME/.kynnod

Your node is now in a pristine state while keeping the original priv_validator.json and config.toml. If you had any sentry nodes or full nodes setup before, your node will still try to connect to them, but may fail if they haven't also been upgraded.

Delete Data

Data for the {{ $themeConfig.project.binary }} binary should be stored at ~/.{{ $themeConfig.project.binary }}, respectively by default. To delete the existing binaries and configuration, run:

rm -rf ~/.kynnod

To clear all data except key storage (if keyring backend chosen) and then you can rerun the full node installation commands from above to start the node again.

Recording Transactions Per Second (TPS)

In order to get a progressive value of the transactions per second, we use Prometheus to return the values.

The Prometheus exporter runs at address http://localhost:8877 so please add this section to your Prometheus installation config.yaml file like this

  scrape_interval: 10s

    monitor: 'kynno'

  - job_name: 'kynno'

    scrape_interval: 10s

      - targets: ['localhost:8877']

and then run Prometheus like this

prometheus --config.file=prom_config.yaml

and then visit the Prometheus dashboard at http://localhost:9090/ then navigate to the expression area and enter the following expression


which will show the rate of transactions processed.

Next {hide}

Learn about running a Kynno testnet {hide}