Starting and using a private ethereum blockhain

0_Instructions.md

Running your own private blockchain and connecting to it.

1. Start bootnode and private network

Go to wherever you want to run this.

  mkdir privatechain
  cd privatechain/
  
  touch genesis.json 
  mkdir data

2. Edit genesis.json (check next file)

3. Run bootnode

bootnode --genkey=boot.key
bootnode --nodekey=boot.key

• Copy the info and replace in the next step

4. Start geth, from the same directory where we were in #1

 geth --datadir="data_directory_from_step_1" init genesis.json
 geth --bootnodes="enode_info_from_step_3@your_ip_public_or_private:30301" --verbosity=6 console

Example:

geth --datadir="/home/itzco/Tech/blockchain/privatechain/data" init genesis.json
  geth --bootnodes="enode://518a1f2661a344b2c6d5a2f618e3763110a224c47b7fcdf5fc78925dbf2807e3abaad136bbb7db67fe601f839e04bf2dc7d746aca773214b9b9b41bd7f25bbc3@192.168.8.57:30301" --verbosity=6 console

Connecting to your private network

....

Notes

Seems to work with remote servers via public IP. Failed after a while with sync issues:

• ethereum/go-ethereum#14381

###References: Instaling ethereum on ubuntu or docker

• https://ethereum.github.io/go-ethereum/install/#install-on-ubuntu-via-ppas

Main reference for private network

• https://gist.github.com/0mkara/b953cc2585b18ee098cd

Secondary:

• https://medium.com/@s4saif.121/demystifying-ethereum-private-blockchain-74f78ddf76fb

Getting your public IP address

• http://www.whatsmyip.org/

Connecting to your private network with mist

• https://ethereum.stackexchange.com/questions/2403/can-mist-be-attached-to-a-geth-node-on-a-different-computer-over-http-rpc
• https://ethereum.stackexchange.com/questions/3026/how-to-connect-mist-to-a-remote-private-network
• https://ethereum.stackexchange.com/questions/4418/how-to-change-to-private-network-in-etherum-wallet#4421
• https://github.com/ethereum/mist

bash.sh

# In the directory of your choice
  mkdir privatechain
  cd privatechain/
  touch genesis.json
  mkdir data
  bootnode --genkey=boot.key
  bootnode --nodekey=boot.key

  # Edit your genesis.json
  geth --datadir="your_directory_from_line_5" init genesis.json
  geth --bootnodes="result_from_line_7_replace_your_ip" --verbosity=6 console

genesis.json

{
  "config": {
        "chainId": 0,
        "homesteadBlock": 0,
        "eip155Block": 0,
        "eip158Block": 0
    },
  "alloc"      : {},
  "coinbase"   : "0x0000000000000000000000000000000000000000",
  "difficulty" : "0x20000",
  "extraData"  : "",
  "gasLimit"   : "0x2fefd8",
  "nonce"      : "0x0000000000000042",
  "mixhash"    : "0x0000000000000000000000000000000000000000000000000000000000000000",
  "parentHash" : "0x0000000000000000000000000000000000000000000000000000000000000000",
  "timestamp"  : "0x00"
}