目录
环境
想法
- 由于挖矿很费性能,对于手上的垃圾服务器来说,要挂nginx和tomcat还要挖矿实在是难为它了。
- 因此想把挖矿的任务分给另一台服务器。
- 目标效果即为:
- 副节点连上主节点,两者的数据同步。
- 主节点关闭挖矿,节省性能,由副节点挖矿。
开搞
让副节点连上主节点
- 注意:
- 不要在副节点上直接打开geth执行
- $ geth attach http://your_ip:8545
- 这样相当于远程连接控制主节点了,就像我们在windows上用ssh远程连接linux去控制geth挖矿的开启和关闭一样,链上仍然只有主节点一个,只不过有主节点本机和另一台机可以去控制主节点。
- 不要在副节点上直接打开geth执行
- 副节点需要和主节点用一样的创世块文件
- 这里就用和之前的文章(以太坊私链搭建)所用的创世块一致
- genesis.json
{
"config":{
"chainId":7,
"homesteadBlock":0,
"eip150Block":0,
"eip155Block":0,
"eip158Block":0,
"byzantiumBlock":0,
"constantinopleBlock":0,
"petersburgBlock":0,
"istanbulBlock":0,
"ethhash":{}
},
"alloc":{},
"coinbase":"0x0000000000000000000000000000000000000000",
"difficulty":"0x2",
"extraData":"",
"gasLimit":"0xffffffff",
"nonce":"0x0000000000000042",
"mixhash":"0x0000000000000000000000000000000000000000000000000000000000000000", "parentHash":"0x0000000000000000000000000000000000000000000000000000000000000000",
"timestamp":"0x00"
}
- 还要准备启动脚本,这里也保持和主节点一致
- rungeth.sh
geth --datadir ./data --networkid 7 --http --http.addr 0.0.0.0 --http.vhosts "*" --http.api "admin,debug,web3,eth,txpool,personal,ethash,miner,net" --http.corsdomain "*" --snapshot --mine --miner.threads 1 --allow-insecure-unlock console 2> 1.log
- 在副节点所在机新建一个用户
- $ geth --datadir ./data account new
- 然后在副节点所在机初始化创世块
- $ sudo geth --datadir ./data init ./genesis.json
- 启动geth
- $ sudo ./rungeth.sh
- 如果是在一台机子上搞两个节点,则要修改他们的运行端口,使之不要重复,不然其中一个会启动不起来。
- 至此,副节点就部署完成了,接下来要在主节点中添加副节点。
- 首先查看一下副节点的enode
- > admin.nodeInfo.enode
- 首先查看一下副节点的enode
- -
- 在主节点添加副节点的enode
- >admin.addPeer("encode")
- 在主节点添加副节点的enode
- 查看是否添加成功
- 方法1:
- 直接对比两者的块高度看看是否相等,如果块比较多,可能需要等待一下同步。
- > eth.blockNumber
- 方法2:
- net.peerCount
- admin.peers
- 方法1:
- 让副节点代替主节点挖矿
- 把主节点挖矿停掉,在主节点所在机执行:
- > miner.stop()
- 让副节点挖矿,在副节点所在机执行:
- > miner.start()
- 把主节点挖矿停掉,在主节点所在机执行:
修改java程序连接副节点
- 上一篇的文章:java使用web3j调用以太坊私链上的智能合约
- 上文中讲到,java程序连接单节点(主节点)的私链去调用智能合约。
- 注意:
- 如果不修改的话,此时主节点虽然开着geth,但关闭了挖矿,只能和副节点进行数据同步,而连接主节点发送的请求都是不能执行的。
- 而且主节点的geth不能关闭,否则副节点也会出问题。
- 不要在开着geth的时候直接关闭ssh窗口,否则会导致链的数据丢失,要在geth里执行> exit 退出。
- 复制副节点的用户私钥文件到java程序执行的机子上,
- 修改java程序使用这个私钥文件,并把用户地址也改成这个私钥文件的用户。
- 修改java程序连接副节点所在的服务器ip地址。
- 到这里就可以了,如此就实现了让副节点代替主节点挖矿的任务了。
存在的问题
- 主节点的账号是不能在连接副节点后使用的,也就是说,两个节点实际上只有链上的数据是互通的,账号是不互通的。因此java程序连接副节点时需要修改。
- 此时主节点只能同步数据,不能挖矿,连接到主节点后发送的交易并不会由副节点代替挖矿完成。
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thin capitalisation – when the company’s activities are financed by borrowed funds).
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