# Quick Start

# Overview

This is a quick start guide. If you have a vague idea about how

works and want to get started right away, continue.

# Install

# Quick Install

To quickly get Tendermint installed on a fresh Ubuntu 16.04 machine, use this script.

WARNING: do not run this on your local machine.

Copycurl -L https://git.io/fFfOR | bash source ~/.profile Expand

The script is also used to facilitate cluster deployment below.

# Manual Install

For manual installation, see the install instructions

# Initialization


Copytendermint init Expand

will create the required files for a single, local node.

These files are found in $HOME/.tendermint:

Copy$ ls $HOME/.tendermint config data $ ls $HOME/.tendermint/config/ config.toml genesis.json node_key.json priv_validator.json Expand

For a single, local node, no further configuration is required. Configuring a cluster is covered further below.

# Local Node

Start tendermint with a simple in-process application:

Copytendermint node --proxy_app=kvstore Expand

and blocks will start to stream in:

CopyI[01-06|01:45:15.592] Executed block module=state height=1 validTxs=0 invalidTxs=0 I[01-06|01:45:15.624] Committed state module=state height=1 txs=0 appHash= Expand

Check the status with:

Copycurl -s localhost:26657/status Expand

# Sending Transactions

With the kvstore app running, we can send transactions:

Copycurl -s 'localhost:26657/broadcast_tx_commit?tx="abcd"' Expand

and check that it worked with:

Copycurl -s 'localhost:26657/abci_query?data="abcd"' Expand

We can send transactions with a key and value too:

Copycurl -s 'localhost:26657/broadcast_tx_commit?tx="name=satoshi"' Expand

and query the key:

Copycurl -s 'localhost:26657/abci_query?data="name"' Expand

where the value is returned in hex.

# Cluster of Nodes

First create four Ubuntu cloud machines. The following was tested on Digital Ocean Ubuntu 16.04 x64 (3GB/1CPU, 20GB SSD). We'll refer to their respective IP addresses below as IP1, IP2, IP3, IP4.

Then, ssh into each machine, and execute this script:

Copycurl -L https://git.io/fFfOR | bash source ~/.profile Expand

This will install go and other dependencies, get the Tendermint source code, then compile the tendermint binary.

Next, use the tendermint testnet command to create four directories of config files (found in ./mytestnet) and copy each directory to the relevant machine in the cloud, so that each machine has $HOME/mytestnet/node[0-3] directory.

Before you can start the network, you'll need peers identifiers (IPs are not enough and can change). We'll refer to them as ID1, ID2, ID3, ID4.

Copytendermint show_node_id --home ./mytestnet/node0 tendermint show_node_id --home ./mytestnet/node1 tendermint show_node_id --home ./mytestnet/node2 tendermint show_node_id --home ./mytestnet/node3 Expand

Finally, from each machine, run:

Copytendermint node --home ./mytestnet/node0 --proxy_app=kvstore --p2p.persistent_peers="ID1@IP1:26656,ID2@IP2:26656,ID3@IP3:26656,ID4@IP4:26656" tendermint node --home ./mytestnet/node1 --proxy_app=kvstore --p2p.persistent_peers="ID1@IP1:26656,ID2@IP2:26656,ID3@IP3:26656,ID4@IP4:26656" tendermint node --home ./mytestnet/node2 --proxy_app=kvstore --p2p.persistent_peers="ID1@IP1:26656,ID2@IP2:26656,ID3@IP3:26656,ID4@IP4:26656" tendermint node --home ./mytestnet/node3 --proxy_app=kvstore --p2p.persistent_peers="ID1@IP1:26656,ID2@IP2:26656,ID3@IP3:26656,ID4@IP4:26656" Expand

Note that after the third node is started, blocks will start to stream in because >2/3 of validators (defined in the genesis.json) have come online. Persistent peers can also be specified in the config.toml. See here for more information about configuration options.

Transactions can then be sent as covered in the single, local node example above.