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Set Up and Run a Node in a Local Private Network

Now that the keyring is populated, it's time to see how to locally run an Injective node. This guide will walk you through the process of setting up a standalone network locally. If you wish to run a node on Mainnet or Testnet, please follow the relevant guides:

Run a Local Node with a Script

To easily set up a local node, download and run the script. This will initialize your local Injective chain.

chmod +x ./ # Make the script executable

Start the node by running:

injectived start # Blocks should start coming in after running this

For further explanation on what the script is doing and more fine-grained control over the setup process, continue reading below.

Initialize the Chain

Before running the Injective Chain node, we need to initialize the chain as well as the node's genesis file:

# The <moniker> argument is the custom username of your node. It should be human-readable.
injectived init <moniker> --chain-id=injective-1

The command above creates all the configuration files needed for your node to run as well as a default genesis file, which defines the initial state of the network. All these configuration files are in ~/.injectived by default, but you can overwrite the location of this folder by passing the --home flag. Note that if you choose to use a different directory other than ~/.injectived, you must specify the location with the --home flag each time an injectived command is run. If you already have a genesis file, you can overwrite it with the --overwrite or -o flag.

The ~/.injectived folder has the following structure:

.                                   # ~/.injectived
|- data # Contains the databases used by the node.
|- config/
|- app.toml # Application-related configuration file.
|- config.toml # Tendermint-related configuration file.
|- genesis.json # The genesis file.
|- node_key.json # Private key to use for node authentication in the p2p protocol.
|- priv_validator_key.json # Private key to use as a validator in the consensus protocol.

Modify the genesis.json File

At this point, a modification is required in the genesis.json file:

  • Change the staking bond_denom, crisis denom, gov denom, and mint denom values to "inj", since that is the native token of the Injective Chain.

This can easily be done by running the following commands:

cat $HOME/.injectived/config/genesis.json | jq '.app_state["staking"]["params"]["bond_denom"]="inj"' > $HOME/.injectived/config/tmp_genesis.json && mv $HOME/.injectived/config/tmp_genesis.json $HOME/.injectived/config/genesis.json
cat $HOME/.injectived/config/genesis.json | jq '.app_state["crisis"]["constant_fee"]["denom"]="inj"' > $HOME/.injectived/config/tmp_genesis.json && mv $HOME/.injectived/config/tmp_genesis.json $HOME/.injectived/config/genesis.json
cat $HOME/.injectived/config/genesis.json | jq '.app_state["gov"]["deposit_params"]["min_deposit"][0]["denom"]="inj"' > $HOME/.injectived/config/tmp_genesis.json && mv $HOME/.injectived/config/tmp_genesis.json $HOME/.injectived/config/genesis.json
cat $HOME/.injectived/config/genesis.json | jq '.app_state["mint"]["params"]["mint_denom"]="inj"' > $HOME/.injectived/config/tmp_genesis.json && mv $HOME/.injectived/config/tmp_genesis.json $HOME/.injectived/config/genesis.json

The commands above will only work if the default .injectived directory is used. For a specific directory, either modify the commands above or manually edit the genesis.json file to reflect the changes.

Create Keys for the Validator Account

Before starting the chain, you need to populate the state with at least one account. To do so, first create a new account in the keyring named my_validator under the test keyring backend (feel free to choose another name and another backend):

injectived keys add my_validator --keyring-backend=test

# Put the generated address in a variable for later use.
MY_VALIDATOR_ADDRESS=$(injectived keys show my_validator -a --keyring-backend=test)

Now that you have created a local account, go ahead and grant it some inj tokens in your chain's genesis file. Doing so will also make sure your chain is aware of this account's existence from the genesis of the chain:

injectived add-genesis-account $MY_VALIDATOR_ADDRESS 100000000000000000000000000inj --chain-id=injective-1

$MY_VALIDATOR_ADDRESS is the variable that holds the address of the my_validator key in the keyring. Tokens in the Injective Chain have the {amount}{denom} format: amount is an 18-digit-precision decimal number, and denom is the unique token identifier with its denomination key (e.g. inj). Here, we are granting inj tokens, as inj is the token identifier used for staking in injectived.

Add the Validator to the Chain

Now that your account has some tokens, you need to add a validator to your chain. Validators are special full-nodes that participate in the consensus process in order to add new blocks to the chain. Any account can declare its intention to become a validator operator, but only those with sufficient delegation get to enter the active set. For this guide, you will add your local node (created via the init command above) as a validator of your chain. Validators can be declared before a chain is first started via a special transaction included in the genesis file called a gentx:

# Create a gentx.
injectived gentx my_validator 1000000000000000000000inj --chain-id=injective-1 --keyring-backend=test

# Add the gentx to the genesis file.
injectived collect-gentxs

A gentx does three things:

  1. Registers the validator account you created as a validator operator account (i.e. the account that controls the validator).
  2. Self-delegates the provided amount of staking tokens.
  3. Link the operator account with a Tendermint node pubkey that will be used for signing blocks. If no --pubkey flag is provided, it defaults to the local node pubkey created via the injectived init command above.

For more information on gentx, use the following command:

injectived gentx --help

Configuring the Node Using app.toml and config.toml

Two configuration files are automatically generated inside ~/.injectived/config:

  • config.toml: used to configure Tendermint (learn more on Tendermint's documentation), and
  • app.toml: generated by the Cosmos SDK (which the Injective Chain is built on), and used for configurations such as state pruning strategies, telemetry, gRPC and REST server configurations, state sync, and more.

Both files are heavily commented—please refer to them directly to tweak your node.

One example config to tweak is the minimum-gas-prices field inside app.toml, which defines the minimum gas prices the validator node is willing to accept for processing a transaction. If it's empty, make sure to edit the field with some value, for example 10inj, or else the node will halt on startup. For the purpose of this tutorial, let's set the minimum gas price to 0:

 # The minimum gas prices a validator is willing to accept for processing a
# transaction. A transaction's fees must meet the minimum of any denomination
# specified in this config (e.g. 0.25token1;0.0001token2).
minimum-gas-prices = "0inj"

Run a Localnet

Now that everything is set up, you can finally start your node:

injectived start # Blocks should start coming in after running this

This command allows you to run a single node, which is is enough to interact with the chain through the node, but you may wish to run multiple nodes at the same time to see how consensus occurs between them.