Joining a Network

After you've tried out running a simple local Terra network, you may want to participate in an existing Terra network, such as the Columbus mainnet or Soju testnet. This document will help you configure and set up your node for just that.

Setup

These instructions are for setting up a brand new full node from scratch.

Initialize and configure moniker

First, initialize the node and create the necessary config files:

terrad init <your_custom_moniker>

NOTE

Monikers can only contain ASCII characters; using Unicode characters will render your node unreachable by other peers in the network.

You can edit this moniker later, in the ~/.terrad/config/config.toml file:

# A custom human readable name for this node
moniker = "<your_custom_moniker>"

Set minimum gas prices for transactions (recommended)

You can edit ~/.terrad/config/app.toml in order to enable anti-spam by rejecting incoming transactions with implied gas price less than a specified minimum:

# 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 = "0.015ukrw,0.015uluna"

Your full node has now been initialized!

Picking a Network

You specify the network you want to join by setting the genesis file and seeds. If you need more information about past networks, check our Networks Repo.

Network	Description
columbus-3	Mainnet	genesis	address book
soju-0014	Testnet	genesis
vodka-0001	Testnet	genesis

Download the genesis file

You'll need to select the network you want to join and download its genesis.json file into your ~/.terrad/config directory. This file specifies the genesis account balances and parameters to use when replaying transactions and syncing.

mkdir -p ~/.terrad/config
curl https://columbus-genesis.s3-ap-northeast-1.amazonaws.com/genesis.json > ~/.terrad/config/genesis.json

Note we use the latest directory in the networks repo which contains details for the latest testnet. If you are connecting to a different testnet, ensure you get the right files.

To verify the correctness of the configuration run:

terrad start

Download address book (recommended)

If you have an address book of peers, download addrbook.json and move it into ~/.terrad/config/addrbook.json. This will give your node a selection of peers to dial to find other nodes.

curl https://network.terra.dev/addrbook.json > ~/.terrad/config/addrbook.json

Define seed nodes

NOTE

For more information on seeds and peers, you can read this.

Your node needs to know how to find peers. You'll need to add healthy seed nodes to ~/.terrad/config/config.toml. Below are some sample seeds provided by Block42, a Terra validator, taken from their excellent validator setup guide.

seeds = "20271e0591a7204d72280b87fdaa854f50c55e7e@106.10.59.48:26656,3b1c85b86528d10acc5475cb2c874714a69fde1e@110.234.23.153:26656,49333a4cb195d570ea244dab675a38abf97011d2@13.113.103.57:26656,7f19128de85ced9b62c3947fd2c2db2064462533@52.68.3.126:26656"

Connecting to the Network

Run your node

Start the full node with this command:

terrad start

Check that everything is running smoothly:

terracli status

Wait for node to sync

Your node should now be catching up with the network by replaying all the transactions from genesis and recreating the blockchain state locally. This will take a long time, so make sure you've set it up on a stable connection so you can leave while it syncs.

View the status of the network with the Terra Finder. Once your full node syncs up to the current block height, you should see it appear on the list of full nodes.

Congratulations! You've now successfully joined a network as a full node operator.

Appendix

Upgrading Testnet

These instructions are for full nodes that have ran on previous testnets and would like to upgrade to the latest testnet.

Reset data

First, remove the outdated files and reset the data.

rm ~/.terrad/config/genesis.json
rm ~/.terrad/config/addrbook.json
terrad unsafe-reset-all

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.

WARNING

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.

Software upgrade

Now it is time to upgrade the software. Go to the project directory, and run:

git checkout master && git pull
make

NOTE

If you have issues at this step, please check that you have the latest stable version of GO installed.

Note we use master here since it contains the latest stable release. See the testnet repo for details on which version is needed for which testnet, and the Terra Core release page for details on each release. Your full node has been cleanly upgraded!

Exporting state

Terra can dump the entire application state to a JSON file, which could be useful for manual analysis and can also be used as the genesis file of a new network.

Export state with:

terrad export > [filename].json

You can also export state from a particular height (at the end of processing the block of that height):

terrad export --height [height] > [filename].json

If you plan to start a new network from the exported state, export with the --for-zero-height flag:

terrad export --height [height] --for-zero-height > [filename].json