# Running a Chain-Node

The Chain-Nodes are the backbone of KYVE. The chain layer is a completely sovereign Proof of Stake (opens new window) blockchain build with Starport (opens new window). This blockchain is run by independent nodes we call Chain-Nodes since they're running on the chain level. The native currency of the KYVE chain is $KYVE, it secures the chain and allows chain nodes to stake and other users to delegate into them.

# Requirements

Minimum requirements

  • 2vCPU
  • 1GB RAM
  • 80GB DISK

The guide uses GNU/Linux for the operating system.

# Genesis Installation

During the time, chain-upgrades occur but the blockchains stays the same. Therefore, it is necessary to process older blocks with the appropriate version. We use Cosmovisor the handle automatic upgrades. The setup is explained after the initial setup.

In the genesis setup the node will be fully configured. After that one needs to configure the Cosmovisor.

# Obtaining the binaries

We provide prebuilt binaries on GitHub (https://github.com/KYVENetwork/chain/releases/tag/v0.0.1 (opens new window)) For building the binaries we refer to the Readme.md in https://github.com/KYVENetwork/chain (opens new window).

Assuming an amd64 Linux system:

Copy wget https://github.com/KYVENetwork/chain/releases/download/v0.0.1/chain_linux_amd64.tar.gz tar -xvzf chain_linux_amd64.tar.gz # The [moniker] is a human-readable name for your node ./chaind init [moniker] --chain-id korellia

Obtain the genesis

Copy wget https://github.com/KYVENetwork/chain/releases/download/v0.0.1/genesis.json # move to the chain-node directory mv genesis.json ~/.kyve/config/genesis.json

It is important to start with the oldest version v0.0.1 (the genesis version).

Start the chain the first time

Copy ./chaind start --p2p.seeds=e56574f922ff41c68b80700266dfc9e01ecae383@3.73.27.185:26656

The node now starts to sync the blockchain.

IMPORTANT: The node can be stopped with strg + C. You do not need to wait for it to sync. Setting up a daemon service is explained later in this chapter.

The seed only needs to be provided for the first startup. It is then automatically saved to the address book.

The chain will start to sync until the first governance upgrade proposal starts to occur. The Chain-Node will halt and probably print a "CONSENSUS FAILURE" error. When this happens the next released binary needs to be started.

To avoid replacing the binaries manually and allow automatic updates we recommend setting up the Cosmovisor.

# Setup Cosmovisor

The Cosmovisor is a tool that listens to on-chain governance proposals and automatically replaces the binary.

The build instructions can be found at https://github.com/cosmos/cosmos-sdk/tree/master/cosmovisor (opens new window) For now we also provide the binary for linux at https://github.com/KYVENetwork/chain/releases/download/v0.0.1/cosmovisor_linux_amd64 (opens new window)

Copy wget https://github.com/KYVENetwork/chain/releases/download/v0.0.1/cosmovisor_linux_amd64 mv cosmovisor_linux_amd64 cosmovisor chmod +x cosmovisor

Setup the directory

Copy mkdir -p ~/.kyve/cosmovisor/genesis/bin/ echo "{}" > ~/.kyve/cosmovisor/genesis/upgrade-info.json

Copy the binary from the first section to the Cosmovisor directory.

Copy cp chaind ~/.kyve/cosmovisor/genesis/bin/chaind

Then export the following environment variables:

Copy export DAEMON_HOME="$HOME/.kyve" export DAEMON_NAME="chaind" # optional on whether auto-download should be enabled # for a simple node setup we recommend to leave this true export DAEMON_ALLOW_DOWNLOAD_BINARIES="true"

IMPORTANT: For production grade validator nodes it is highly recommended turning off auto download and downloading binaries manually instead.

Start the Cosmovisor

Copy ./cosmovisor start

The Cosmovisor can be stopped with strg + C. Setting up a daemon service is explained later in this chapter.

# Obtaining binaries manually

This is needed when DAEMON_ALLOW_DOWNLOAD_BINARIES is set to false.

When a new chain-upgrade proposal occurs, users have multiple days time to vote on it. The upgrade-proposal specifies an exact block-height on which the upgrade will be performed. When the proposal is up for vote the GitHub repository is already updated with the new tag and version.

Node-runners then have to check out the specific tag and build the binary on their on. After that the binary needs to be copied to the Cosmovisor directory.

Copy mv chaind ~/.kyve/cosmovisor/upgrades/$UPGRADE_NAME/bin/chaind

The $UPGRADE_NAME will be the name of the tag of the commit. And is also specified in the governance proposal.

# Setting up Deamon-service

For the daemon service root-privileges are required during the setup.

Create a service file. $USER is the Linux user which runs the process. Replace it before you copy the command

Copy tee <<EOF > /dev/null /etc/systemd/system/kyved.service [Unit] Description=KYVE Chain-Node daemon After=network-online.target [Service] User=$USER ExecStart=/home/$USER/cosmovisor start Restart=on-failure RestartSec=3 LimitNOFILE=infinity Environment="DAEMON_HOME=/home/$USER/.kyve" Environment="DAEMON_NAME=chaind" Environment="DAEMON_ALLOW_DOWNLOAD_BINARIES=true" [Install] WantedBy=multi-user.target EOF

Start the daemon

Copy sudo systemctl enable kyved sudo systemctl start kyved # stop it with sudo systemctl stop kyved

# Becoming a validator

For becoming a validator you need $KYVE. There are currently 100 validator slots. If all slots are taken you need to stake more than the lowest one in the list to become a validator.

Make sure your node is fully synced and configured correctly.

Create a key or import an existing one

Copy ./chaind keys add [your-key-name] # or ./chaind keys add [your-key-name] --recover # It then asks for the mnemonic

Make sure you have enough balance in your wallet.

Become a validator by submitting the create-validator transaction to the network. You need to substitute [amount], [moniker] and [your-key-name]

Copy ./chaind tx staking create-validator --yes \ --amount [amount]tkyve \ --moniker [moniker] \ --commission-rate "0.10" \ --commission-max-rate "0.20" \ --commission-max-change-rate "0.01" \ --min-self-delegation "1" \ --pubkey "$(./chaind tendermint show-validator)" \ --from [your-key-name] \ --chain-id korellia

Learn your valoper address

Copy ./chaind keys show [your-key-name] -a --bech val

Delegate additional stake

Copy ./chaind tx staking delegate [VALOPER_ADDRESS] [STAKE_AMOUNT]tkyve --from [your-key-name] --chain-id korellia

Unjail

Copy ./chaind tx slashing unjail --chain-id korellia --from [your-key-name]