README.md

private chain ethereum docker

Creation of a private blockchain under ethereum through docker (docker-compose)

Steps to setup

Clone repo

git clone https://github.com/eduadiez/private_chain_ethereum_docker.git

Init (only the first time)

docker-compose -f docker-compose-init.yml up

Start

docker-compose up -d

Stop

docker-compose stop

BE CAREFOUL! By default it exposes to internt (--rpcaddr "0.0.0.0" --wsaddr "0.0.0.0") so any one can access from outside.

Usage

By default it begins to mine in the address "0xabdd735da6639a36fbe02020661e16ec29be214e" (default coinbase) All of the chain data is saved to 'node' directory Private keys are save to 'files/keystore' directory

Version

docker exec -ti private-ethereum geth version
Geth
Version: 1.7.0-unstable
Architecture: amd64
Protocol Versions: [63 62]
Network Id: 1
Go Version: go1.7.3
Operating System: linux
GOPATH=
GOROOT=/usr/lib/go

Attach to JavaScript console

docker exec -ti private-ethereum geth attach

New account

The private key is save to 'files/keystore'

docker exec -ti private-ethereum geth account new

JavaScript console examples

# Stop mining
> miner.stop()
true

# Start mining 1 thread
> miner.start(1)
null

# Get coinbase
> eth.coinbase
"0xabdd735da6639a36fbe02020661e16ec29be214e"

# Get balance
> web3.fromWei(eth.getBalance(eth.coinbase), "ether");
225

# Get current block
> eth.blockNumber
12

# Send Transaction
personal.unlockAccount(eth.accounts[0],"eduadiez")
personal.unlockAccount(eth.accounts[1],"eduadiez")
eth.sendTransaction({from: eth.accounts[0], to: eth.accounts[1], value: web3.toWei(1, "ether")})

Other examples

Console: miner.start(4)

IPC: echo '{"jsonrpc":"2.0","method":"miner_start","params":[4],"id":1}' | nc -U $datadir/geth.ipc

HTTP: curl -X POST --data '{"jsonrpc":"2.0","method":"miner_start","params":[4],"id":74}' localhost:8545

The genesis file

{
	"config": {
		"chainId": 3,
		"homesteadBlock": 0,
		"eip155Block": 0,
		"eip158Block": 0
	},
	"nonce": "0x0000000000000042",
	"mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000",
	"difficulty": "0x400",
	"coinbase": "0xabdd735da6639a36fbe02020661e16ec29be214e",
	"timestamp": "0x0",
	"parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
	"extraData": "0x",
	"gasLimit": "0x8000000",
	"alloc": {
		"0xabdd735da6639a36fbe02020661e16ec29be214e" : {"balance": "20000000000000000000"}
	}
}

Connect to mist

(Windows) ...\Ethereum Wallet.exe" --rpc http://localhost:8545 
(Mac) /Applications/Ethereum\ Wallet.app/Contents/MacOS/Ethereum\ Wallet --rpc http://localhost:8545

References and documentation

• https://souptacular.gitbooks.io/ethereum-tutorials-and-tips-by-hudson/content/private-chain.html
• https://github.com/Capgemini-AIE/ethereum-docker
• https://github.com/ethereum/go-ethereum
• https://github.com/ethereum/go-ethereum/wiki/Management-APIs
• https://github.com/ethereum/go-ethereum/wiki/Command-Line-Options
• https://etherconverter.online/