laconicd/docs/testnet/join.md

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# Joining a Testnet
This document outlines the steps to join an existing testnet {synopsis}
## Install `ethermintd`
Follow the [installation](./../quickstart/installation) document to install the Ethermint binary `ethermintd`.
:::warning
Make sure you have the right version of `ethermintd` installed
:::
## Initialize Node
We need to initialize the node to create all the necessary validator and node configuration files:
```bash
ethermintd init <your_custom_moniker>
```
::: danger
Monikers can contain only ASCII characters. Using Unicode characters will render your node unreachable.
:::
By default, the `init` command creates your `~/.ethermintd` directory with subfolders `config/` and `data/`.
In the `config` directory, the most important files for configuration are `app.toml` and `config.toml`.
## Genesis & Seeds
### Copy the Genesis File
Check the genesis file from the [`testnets`](https://github.com/tharsis/testnets) repository and copy it over to the `config` directory: `~/.ethermintd/config/genesis.json`.
Then verify the correctness of the genesis configuration file:
```bash
ethermintd validate-genesis
```
### Add Seed Nodes
Your node needs to know how to find peers. You'll need to add healthy seed nodes to `$HOME/.ethermintd/config/config.toml`. The [`testnets`](https://github.com/tharsis/testnets) repo contains links to some seed nodes.
Edit the file located in `~/.ethermintd/config/config.toml` and the `seeds` to the following:
```toml
#######################################################
### P2P Configuration Options ###
#######################################################
[p2p]
# ...
# Comma separated list of seed nodes to connect to
seeds = ""
```
:::tip
For more information on seeds and peers, you can the Tendermint [P2P documentation](https://docs.tendermint.com/master/spec/p2p/peer.html).
:::
### Start testnet
The final step is to [start the nodes](./../quickstart/run_node#start-node). Once enough voting power (+2/3) from the genesis validators is up-and-running, the testnet will start producing blocks.
```bash
ethermintd start
```
## Upgrading Your Node
> NOTE: These instructions are for full nodes that have ran on previous versions of and would like to upgrade to the latest testnet.
### Reset Data
:::warning
If the version <new_version> you are upgrading to is not breaking from the previous one, you **should not** reset the data. If this is the case you can skip to [Restart](#restart)
:::
First, remove the outdated files and reset the data.
```bash
rm $HOME/.ethermintd/config/addrbook.json $HOME/.ethermintd/config/genesis.json
ethermintd 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.
::: danger 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.
:::
### Restart
To restart your node, just type:
```bash
ethermintd start
```