2 How to create a local private multi-node Ethereum network (geth console) – Ethereum from scratch:

Published on July 27, 2021

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Part two of my hands on tutorial series on Ethereum. In the first video we installed Geth – in this one we actually get our hands dirty and start using it.

We are just creating a private local ethereal network – with two nodes – I show how to initialise a new blockchain from a sample genesis block, how to start the javascript console and some basic commands to get you started.

I start a miner, show the block height increasing and that the blockchain is being communicated across both separate nodes.

This is intended to be a very hands on tutorial so please follow along.

Here is the script from the session.

NOTE angle brackets i.e. the GREATER THAN SYMBOL are not allowed in the description so I’ve replaced with &gt – you need to replace with the GREATER THAN symbol when running the command

  1. Set up the environment

cd ~
mkdir ethereum

echo ‘export ethereum_home=/Users/mattthomas/ethereum’ (double right arrow) ~/.bash_profile ~/.bash_profile

cd ethereum
vi $ethereum_home/genesis.json
(pasre this with cmd v in edit mode)

"nonce": "0x0000000000000042",
"timestamp": "0x0",
"parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
"extraData": "0x0",
"gasLimit": "0x8000000",
"difficulty": "0x400",
"mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000",
"coinbase": "0x3333333333333333333333333333333333333333",

Save with esc !wq

  1. initialise the block
    geth –datadir “$ethereum_home/youtube1” init “$ethereum_home/genesis.json”

  2. start the console
    geth –datadir “$ethereum_home/chain5” console 2 &gt console.log

3.create a 2nd node
geth –datadir “$ethereum_home/youtube1-a” init “$ethereum_home/genesis.json”

  1. Start on a different port and specify networkid
    geth –datadir “$ethereum_home/youtube1-a” –port 30304 –nodiscover –networkid 1234 console 2 &gt console.log

  2. get the admin.nodeInfo enode from the second instance and copy it into admin.addPeer in the first node

  3. Restart specifying IPC path
    geth –datadir “$ethereum_home/youtube1-a” –port 30304 –nodiscover –ipcpath “$ethereum_home/youtube1-a/geth.ipc” –networkid 1234 console 2 &gt console.log

7 run get attach to attach another window to the node using the pic file
geth attach ipc:$ethereum_home/youtube1-a/geth.ipc

8 Key commands from the javascript console
(add password)
Miner.start(1) – start mining
eth.blockNumber – current block height
eth.getBlock(number).miner – miner of block at that number
eth.getBalance(account address) – current balance of that account

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