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GETH PRIVATE NETWORK

genesis.json

{
    "config": {
        "chainId": 123456,
        "homesteadBlock": 0,
        "eip155Block": 0,
        "eip158Block": 0
    },
    "difficulty": "200000",
    "gasLimit": "8000000",
    "alloc": {}
}

geth 설치 필수

https://geth.ethereum.org/downloads/

cmd1 - geth server start

  C:\Users\NIPA-55\Desktop\ether_test> geth --datadir ./ init ./genesis.json

  // chainId와 NETWORKID 동일

  geth --rpc --rpcaddr localhost --rpcport 8545 --rpccorsdomain "*" --rpcapi net,web3,eth,db,miner,admin,personal --datadir ./ -networkid 123456 --nodiscover

cmd2

  C:\Users\NIPA-55>geth attach http://localhost:8545
  Welcome to the Geth JavaScript console!

  modules: admin:1.0 eth:1.0 miner:1.0 net:1.0 personal:1.0 rpc:1.0 web3:1.0

  // 계정 확인
  > eth.accounts
  ["0x5b83c0df816de4a36e778e806f82ba8eb39caf81", "0xc136decefd36bc06f08f341acae647222e93f2e9"]

  // 마이닝 계정 설정
  > miner.setEtherbase(eth.accounts[0])
  true

  // 계정 unlock
  > personal.unlockAccount(eth.accounts[0])
  Unlock account 0x5b83c0df816de4a36e778e806f82ba8eb39caf81
  Passphrase:
  true

  // 마이닝 start
  > miner.start()
  null

  // 마이닝 중
  INFO [08-01|10:41:00.166] 🔗 block reached canonical chain          number=15 hash=86c0eb…84d931
  INFO [08-01|10:41:00.186] 🔨 mined potential block                  number=22 hash=94fff7…505f20
  INFO [08-01|10:41:00.199] Commit new mining work                   number=23 sealhash=9a2428…6fc844 uncles=0 txs=0 gas=0 fees=0 elapsed=32.913ms
  INFO [08-01|10:41:01.689] Successfully sealed new block            number=23 sealhash=9a2428…6fc844 hash=3f873c…63fa51 elapsed=1.521s
  INFO [08-01|10:41:01.694] 🔗 block reached canonical chain          number=16 hash=4f8977…ea0202
  INFO [08-01|10:41:01.702] 🔨 mined potential block                  number=23 hash=3f873c…63fa51
  INFO [08-01|10:41:01.715] Commit new mining work

  // 마이닝 stop
  > miner.stop()
  null

  // 블럭 확인
  > eth.blockNumber
  55

  // 이더 확인
  > eth.getBalance(eth.accounts[0])
  275000000000000000000
  // 송금
  > eth.sendTransaction({from: eth.accounts[0], to: eth.accounts[1] , value : 1000000000000000000})
  "0x00b56a8e0af608ccab711595d2d0b2524f4eb351a634c537fe9edf8a818999f9"

  > eth.getBalance(eth.accounts[0])
  275000000000000000000
  > eth.getBalance(eth.accounts[1])
  0

  > miner.start()
  null
  > miner.stop()
  null

  // 마이닝 후
  > eth.getBalance(eth.accounts[1])
  1000000000000000000
  > eth.getBalance(eth.accounts[0])
  344000000000000000000
  >

  // 트랜잭션 정보
  > eth.getTransaction("0x00b56a8e0af608ccab711595d2d0b2524f4eb351a634c537fe9edf8a818999f9")

  {
    blockHash: "0x13a9ca6bbd609e6c209aa4ab20aab40ad72e223fa1f25a98ddbe788c5278ff11",
    blockNumber: 56,
    from: "0x5b83c0df816de4a36e778e806f82ba8eb39caf81",
    gas: 90000,
    gasPrice: 1000000000,
    hash: "0x00b56a8e0af608ccab711595d2d0b2524f4eb351a634c537fe9edf8a818999f9",
    input: "0x",
    nonce: 0,
    r: "0x9ed83d8871b49c090e3217c15c1dac475e55f0d384d6b42fa304594cf2e43f22",
    s: "0x5e2912260174e50a801bd20ae437517928653e0727483c2ae1f082d67a281a4a",
    to: "0xc136decefd36bc06f08f341acae647222e93f2e9",
    transactionIndex: 0,
    v: "0x3c4a3",
    value: 1000000000000000000
  }

smart contract

pragma solidity ^0.5.0;

contract test {

    string a;

    function set(string memory _a) public {
        a=_a;
    }

    function get() public view returns(string memory){
        return a;
    }
}