在做一些测试工作的时候, 为了方便控制以及更快的进入真正的测试工作,可能需要搭建一个私有的以太坊网络.
而以太坊节点之间能够互相链接需要满足1)相同的协议版本2)相同的networkid,所以搭建私有网络最方便的方法就是通过geth命令中的--networkid选项,设置一个与主网不同的networkid(主网的networkid为1),这也是官方推荐的方法.
下面开始建立私有以太坊网络:
mkdir private-geth
cd private-geth
建立创世纪区块文件,是一个json格式的文件:
vim genesis.json
在创世纪区块的json文件中填入以下内容, 并保存.
{
"config": {
"chainId": 15,
"homesteadBlock": 0,
"eip155Block": 0,
"eip158Block": 0
},
"coinbase" : "0x0000000000000000000000000000000000000000",
"difficulty" : "0x40000",
"extraData" : "",
"gasLimit" : "0xffffffff",
"nonce" : "0x0000000000000042",
"mixhash" : "0x0000000000000000000000000000000000000000000000000000000000000000",
"parentHash" : "0x0000000000000000000000000000000000000000000000000000000000000000",
"timestamp" : "0x00",
"alloc": { }
}
初始化创世纪节点,并设置data目录:
geth --datadir ./data/00 init genesis.json
启动节点, 加上console 表示启动后,启用命令行:
geth --datadir ./data/00 --networkid 15 console
在有一个账户之前,什么事情都不能干....,先继续在命令行中输入命令,查看当前节点中的账户:
> eth.accounts
[]
输出了一个"[]",说明毛都么有一根,更别说账户了.既然没有,那就来创建一个,继续输入命令:
> personal.newAccount("123456")
正常情况,命令行会输出:
INFO [05-15|23:59:29] New wallet appeared url=keystore:///home/zl/Documents/p… status=Locked
"0x5b901c2495c077f515ae84fc53206f2eb3bf8296"
再用之前查看账户的命令看看:
> eth.accounts
["0x5b901c2495c077f515ae84fc53206f2eb3bf8296"]
有输出了"0x5b.......96"这一串就是账户的地址.
账户有了,接下来做点更有意思的事,开始挖矿....继续在命令行书输出:
> miner.start()
INFO [05-16|00:07:25] Updated mining threads threads=0
INFO [05-16|00:07:25] Starting mining operation
null
INFO [05-16|00:07:25] Commit new mining work number=1 txs=0 uncles=0 elapsed=38.053ms
INFO [05-16|00:07:28] Generating DAG in progress epoch=0 percentage=0 elapsed=1.715s
INFO [05-16|00:07:30] Generating DAG in progress epoch=0 percentage=1 elapsed=3.448s
INFO [05-16|00:07:31] Generating DAG in progress epoch=0 percentage=2 elapsed=5.059s
INFO [05-16|00:07:33] Generating DAG in progress epoch=0 percentage=3 elapsed=6.799s
INFO [05-16|00:07:35] Generating DAG in progress epoch=0 percentage=4 elapsed=8.373s
...................................这个percenage=100,也就是100%以后.,就不断的出现下面的提示.............
INFO [05-16|00:24:54] Successfully sealed new block number=36 hash=95fdfd…1411ee
INFO [05-16|00:24:54] ?? block reached canonical chain number=31 hash=438022…f6592e
.................................好多这个提示,挖到好多矿................................
INFO [05-16|00:24:54] ?? mined potential block number=36 hash=95fdfd…1411ee
INFO [05-16|00:24:54] Commit new mining work number=37 txs=0 uncles=0 elapsed=122.202μs
然后停止挖矿:
>miner.stop()
true
然后再来看看我们账户钱包有多少矿了:
> eth.getBalance(eth.accounts[0])
355000000000000000000
下一篇,我会讲一讲如何搭建 私有网络节点群:
Setting up private network or local cluster
参考文档:
http://ethdocs.org/en/latest/network/test-networks.html?highlight=private%20chain
https://github.com/ethereum/go-ethereum/wiki/Private-network
https://github.com/ethereum/go-ethereum/wiki/Setting-up-private-network-or-local-cluster
http://chainskills.com/2017/03/10/part-3-setup-the-private-chain-miners/