创建私链并部署合约

使用dev的方式创建以太坊私链(单节点)

启动私链

# 开启私链
geth --networkid 123 --dev --datadir data1 --rpc --rpcaddr 192.168.1.114 --rpcport 8989 --port 3000
# 进入私链控制台
cd data1
geth attach ipc:geth.ipc

创建合约

1. 使用npm下载solcjs

npm install -g solc@0.4.17

2. 新建 HelloWorld.sol 文件，并写如下代码

pragma solidity ^0.4.17;

contract HelloWorld{
    function mutiply(uint number) public returns(uint){
        return number*6;
    }
}

3. 使用solcjs编译代码，得到二进制和abi文件

solcjs --bin --abi HelloWorld.sol 

部署合约

var code = "0x..." //将编译生成的二进制内容拷贝到字符串中
var abi = ... //将abi内容拷贝过来
var myContract = eth.contract(abi)
web3.eth.estimateGas({data:code}) //评估汽油费
personal.unlockAccount(personal.listAccount[0]) //输入密码，解锁第一个账户
//部署合约
var contract = myContract.new({from:personal.listAccount[0],data:code,gas:200000})
//挖矿，将合约加入区块链
miner.start()
miner.stop()
//测试方法
contract.mutiply.call(6) //结果为 36

---

使用创世纪块初始化以太坊私链，并部署多节点

新建创世块文件，genesis.json 并写入以下内容：

{
  "config": {
    "chainId": 101,
    "homesteadBlock": 0,
    "eip155Block": 0,
    "eip158Block": 0
  },
  "alloc": {},
  "coinbase": "0x0000000000000000000000000000000000000000",
  "difficulty": "0x400",
  "extraData": "",
  "gasLimit": "0xffffffff",
  "nonce": "0x0000000000000042",
  "mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "timestamp": "0x00"
}

节点1

1. 初始化节点1的创世块

geth --datadir  data1  init  genesis.json

1. 启动节点1

geth  --datadir data1 --rpcport 8481 --port 30301 --networkid 29381 console

节点2

1. 初始化节点2的创世块

geth --datadir  data2  init  genesis.json

1. 启动节点2

geth  --datadir data2 --rpcport 8482 --port 30302 --networkid 29381 console

连接两个节点并验证连接的有效性

1. 查看节点1的信息

admin.nodeInfo

结果：

{
  enode: "enode://49d1e1238345d2a457d42da3a87a22cfbecca9c55bab57fa0f15ab8d05c3c107147da17b38e1fbe7ce608f02e8968d4d16501eb794eb0edf2404fdf26d9bffa7@113.46.147.90:30301",
  id: "61fa75d7e36d6949d8486e485a58a81454b69692fc78e47c5a104b60e02d2649",
  ip: "113.46.147.90",
  listenAddr: "[::]:30301",
  name: "Geth/v1.8.17-stable/linux-amd64/go1.9.7",
  ports: {
    discovery: 30301,
    listener: 30301
  },
  protocols: {
    eth: {
      config: {
        chainId: 101,
        eip150Hash: "0x0000000000000000000000000000000000000000000000000000000000000000",
        eip155Block: 0,
        eip158Block: 0,
        homesteadBlock: 0
      },
      difficulty: 1024,
      genesis: "0x2720038ef46044a7a895296b85745294340ecfcedc32f8c9e9802129aeb62890",
      head: "0x2720038ef46044a7a895296b85745294340ecfcedc32f8c9e9802129aeb62890",
      network: 29381
    }
  }
}

2. 将节点1的enode信息加入节点2

在节点2的终端输入以下内容：

admin.addPeer("enode://49d1e1238345d2a457d42da3a87a22cfbecca9c55bab57fa0f15ab8d05c3c107147da17b38e1fbe7ce608f02e8968d4d16501eb794eb0edf2404fdf26d9bffa7@113.46.147.90:30301")

3. 验证节点是否加入成功

admin.peers

结果：

[{
    caps: ["eth/63"],
    enode: "enode://49d1e1238345d2a457d42da3a87a22cfbecca9c55bab57fa0f15ab8d05c3c107147da17b38e1fbe7ce608f02e8968d4d16501eb794eb0edf2404fdf26d9bffa7@113.46.147.90:30301",
    id: "61fa75d7e36d6949d8486e485a58a81454b69692fc78e47c5a104b60e02d2649",
    name: "Geth/v1.8.17-stable/linux-amd64/go1.9.7",
    network: {
      inbound: false,
      localAddress: "192.168.1.114:38360",
      remoteAddress: "113.46.147.90:30301",
      static: true,
      trusted: false
    },
    protocols: {
      eth: {
        difficulty: 1024,
        head: "0x2720038ef46044a7a895296b85745294340ecfcedc32f8c9e9802129aeb62890",
        version: 63
      }
    }
}]