为了进一步了解以太坊区块链网络的工作方式和运行原理,笔者通过官方软件Geth搭建了私有以太坊网络fantasynetwork,最终实现了单机和多机节点间的相互连通:首先通过VMware Workstation创建基础Ubuntu实验平台,再安装Golang1、Geth2等依赖环境;其次使用puppeth工具生成私网的配置文件fantasynetwork.json并复制到三个节点目录下,三个节点均使用该配置文件初始化网络;最后使用static-nodes.json的方式将三个节点设为默认接入节点,实现节点间的连通,连通后各节点中的账户可以互相转账挖矿。
单机多节点私网3本试验的项目结构为:
privateNet
├── accounts.txt
├── fantasynetwork.json
├── node1
│ ├── geth
│ ├── keystore
│ ├── node.sh
│ ├── password.txt
│ └── static-nodes.json
├── node2
│ ├── geth
│ ├── keystore
│ ├── node.sh
│ ├── password.txt
│ └── static-nodes.json
└── node3
├── geth
├── keystore
├── node.sh
├── password.txt
└── static-nodes.json
- 创建私网工作目录mkdir privateNet && cd privateNet
- 创建三个节点数据目录mkdir node1 node2 node3
privateNet/
├── node1
├── node2
└── node3
- Node1
test@ubuntu:~/privateNet$ geth --datadir node1/ account new
Your new account is locked with a password. Please give a password. Do not forget this password.
Password:
Repeat password:
Your new key was generated
Public address of the key: 0x600d77B8ce36B829BFC8a1Cc5696Faf2218bDf75
Path of the secret key file: node1/keystore/UTC--2021-08-11T04-51-26.533482715Z--600d77b8ce36b829bfc8a1cc5696faf2218bdf75
Node 2
test@ubuntu:~/privateNet$ geth --datadir node2/ account new
Your new account is locked with a password. Please give a password. Do not forget this password.
Password:
Repeat password:
Your new key was generated
Public address of the key: 0x2F7fD5BD0026f7C2f0dB94b79D58AFE517BC56d2
Path of the secret key file: node2/keystore/UTC--2021-08-11T04-53-30.820914994Z--2f7fd5bd0026f7c2f0db94b79d58afe517bc56d2
Node3
test@ubuntu:~/privateNet$ geth --datadir node3/ account new
Your new account is locked with a password. Please give a password. Do not forget this password.
Password:
Repeat password:
Your new key was generated
Public address of the key: 0x6c1440E9c6Ca93C18B1e2A069D1D5a70e29C2363
Path of the secret key file: node3/keystore/UTC--2021-08-11T04-54-24.244487186Z--6c1440e9c6ca93c18b1e2a069d1d5a70e29c2363
在此创建账户的密码设置为fantasy,操作完成后会在每个节点目录下的keystore目录中找到账户密钥文件/钱包地址。
保存账户凭证- 将以上账户的公钥地址保存至文本文件
echo '0x600d77B8ce36B829BFC8a1Cc5696Faf2218bDf75' >> accounts.txt
echo '0x2F7fD5BD0026f7C2f0dB94b79D58AFE517BC56d2' >> accounts.txt
echo '0x6c1440E9c6Ca93C18B1e2A069D1D5a70e29C2363' >> accounts.txt
为了实验方便,将账户对应的密码文件保存至对应节点目录下
echo 'fantasy' > node1/password.txt
echo 'fantasy' > node2/password.txt
echo 'fantasy' > node3/password.txt
- 设置网络名称
test@ubuntu:~/privateNet$ puppeth
Please specify a network name to administer (no spaces, hyphens or capital letters please)
> fantasynetwork
Sweet, you can set this via --network=fantasynetwork next time!
INFO [08-10|22:08:31.110] Administering Ethereum network name=fantasynetwork
WARN [08-10|22:08:31.110] No previous configurations found path=/home/test/.puppeth/fantasynetwork
选择程序功能
What would you like to do? (default = stats)
1. Show network stats
2. Configure new genesis
3. Track new remote server
4. Deploy network components
> 2
选择创建网络
What would you like to do? (default = create)
1. Create new genesis from scratch
2. Import already existing genesis
> 1
选择共识算法
Which consensus engine to use? (default = clique)
1. Ethash - proof-of-work
2. Clique - proof-of-authority
> 1
选择默认账号
Which accounts should be pre-funded? (advisable at least one)
> 0x600d77B8ce36B829BFC8a1Cc5696Faf2218bDf75
> 0x2F7fD5BD0026f7C2f0dB94b79D58AFE517BC56d2
> 0x6c1440E9c6Ca93C18B1e2A069D1D5a70e29C2363
> 0x
设置默认单位
Should the precompile-addresses (0x1 .. 0xff) be pre-funded with 1 wei? (advisable yes)
> yes
设置网络ID
Specify your chain/network ID if you want an explicit one (default = random)
> 7777
INFO [08-10|22:16:40.485] Configured new genesis block
导出配置文件
What would you like to do? (default = stats)
1. Show network stats
2. Manage existing genesis
3. Track new remote server
4. Deploy network components
> 2
1. Modify existing configurations
2. Export genesis configurations
3. Remove genesis configuration
> 2
Which folder to save the genesis specs into? (default = current)
Will create fantasynetwork.json, fantasynetwork-aleth.json, fantasynetwork-harmony.json, fantasynetwork-parity.json
>
INFO [08-10|22:18:48.283] Saved native genesis chain spec path=fantasynetwork.json
INFO [08-10|22:18:48.285] Saved genesis chain spec client=aleth path=fantasynetwork-aleth.json
INFO [08-10|22:18:48.286] Saved genesis chain spec client=parity path=fantasynetwork-parity.json
INFO [08-10|22:18:48.287] Saved genesis chain spec client=harmony path=fantasynetwork-harmony.json
退出工具
What would you like to do? (default = stats)
1. Show network stats
2. Manage existing genesis
3. Track new remote server
4. Deploy network components
> ^C
此时可在当前目录下看见生成的四个配置文件,在此只用到fantasynetwork.json文件,其他文件可删去。
- 修改配置文件 为了更容易挖到矿,将配置文件中difficulty难度值调小(其它参数含义可参考《创世区块配置文件genesis.json的格式解读》4):
初始化三个节点
每个节点必须使用相同的配置文件进行初始化:
geth --datadir node1/ init fantasynetwork.json
geth --datadir node2/ init fantasynetwork.json
geth --datadir node3/ init fantasynetwork.json
进入对应的节点目录下执行一下命令(其它参数含义可参考《以太坊客户端Geth命令用法-参数详解》5):
- Node1
geth --nousb --datadir=$pwd --syncmode 'full' --port 27271 --miner.gasprice 0 --miner.gastarget 470000000000 --http --http.addr 'localhost' --http.port 7271 --http.api admin,eth,miner,net,txpool,personal,web3 --mine --allow-insecure-unlock --unlock "0x600d77B8ce36B829BFC8a1Cc5696Faf2218bDf75" --password password.txt
得到节点一的enode
enode://0f870fa3f8085f5abf74ea7c2a12a0809a9daaece20e3b1c4c80fb6929ff652681068c6ffd47852a4544dc282a4a15f531b452e05c4f1cf6861d4fb3b728edeb@127.0.0.1:27271
Node2
geth --nousb --datadir=$pwd --syncmode 'full' --port 27272 --miner.gasprice 0 --miner.gastarget 470000000000 --http --http.addr 'localhost' --http.port 7272 --http.api admin,eth,miner,net,txpool,personal,web3 --mine --allow-insecure-unlock --unlock "0x2F7fD5BD0026f7C2f0dB94b79D58AFE517BC56d2" --password password.txt
得到节点二的enode:
enode://45c2fc2bfdf0f48afe2083d82cc1cc642a96fcc2815755024a17b95b9fd1b3124f89e186c88a5013ced1c00bd10060a90e6b53e94fdbbfa6098b3088b3f78274@127.0.0.1:27272
Node3
geth --nousb --datadir=$pwd --syncmode 'full' --port 27273 --miner.gasprice 0 --miner.gastarget 470000000000 --http --http.addr 'localhost' --http.port 7273 --http.api admin,eth,miner,net,txpool,personal,web3 --mine --allow-insecure-unlock --unlock "0x6c1440E9c6Ca93C18B1e2A069D1D5a70e29C2363" --password password.txt
得到节点三的enode:
enode://ae4b4e18afa6238753e14ca3e99c0858509fc76efee715dd1c8278bbb7eaa5614fdc8b77a82bf7baf128c14ef574cc6701514fbb97780d30c731f7bc82dfd932@127.0.0.1:27273
Geth主要有三种方法连通其它节点:启动前配置static-nodes.json文件添加节点、启动时通过--bootnodes添加节点、启动后在控制台通过admin.addPeer命令添加节点。在此我们使用第一种方法。
- 在工作目录下创建static-nodes.json
[
"enode://0f870fa3f8085f5abf74ea7c2a12a0809a9daaece20e3b1c4c80fb6929ff652681068c6ffd47852a4544dc282a4a15f531b452e05c4f1cf6861d4fb3b728edeb@127.0.0.1:27271",
"enode://45c2fc2bfdf0f48afe2083d82cc1cc642a96fcc2815755024a17b95b9fd1b3124f89e186c88a5013ced1c00bd10060a90e6b53e94fdbbfa6098b3088b3f78274@127.0.0.1:27272",
"enode://ae4b4e18afa6238753e14ca3e99c0858509fc76efee715dd1c8278bbb7eaa5614fdc8b77a82bf7baf128c14ef574cc6701514fbb97780d30c731f7bc82dfd932@127.0.0.1:27273"
]
将该文件复制到每个节点根目录下:
cp static-nodes.json node1/
cp static-nodes.json node2/
cp static-nodes.json node3/
为了简化启动,可以创建启动节点批处理文件
- node1/node.sh
nohup geth --nousb --datadir=$pwd --syncmode 'full' --port 27271 --miner.gasprice 0 --miner.gastarget 470000000000 --http --http.addr 'localhost' --http.port 7271 --http.api admin,eth,miner,net,txpool,personal,web3 --mine --allow-insecure-unlock --unlock "0x600d77B8ce36B829BFC8a1Cc5696Faf2218bDf75" --password password.txt &
echo "Geth started on node 1"
node2/node.sh
nohup geth --nousb --datadir=$pwd --syncmode 'full' --port 27272 --miner.gasprice 0 --miner.gastarget 470000000000 --http --http.addr 'localhost' --http.port 7272 --http.api admin,eth,miner,net,txpool,personal,web3 --mine --allow-insecure-unlock --unlock "0x2F7fD5BD0026f7C2f0dB94b79D58AFE517BC56d2" --password password.txt &
echo "Geth started on node 2"
node2/node.sh
nohup geth --nousb --datadir=$pwd --syncmode 'full' --port 27273 --miner.gasprice 0 --miner.gastarget 470000000000 --http --http.addr 'localhost' --http.port 7273 --http.api admin,eth,miner,net,txpool,personal,web3 --mine --allow-insecure-unlock --unlock "0x6c1440E9c6Ca93C18B1e2A069D1D5a70e29C2363" --password password.txt &
echo "Geth started on node 3"
启动各节点
test@ubuntu:~/privateNet/node1$ sh node.sh
test@ubuntu:~/privateNet/node2$ sh node.sh
test@ubuntu:~/privateNet/node3$ sh node.sh
打开三个终端,使用geth attach命令接入三个节点命令行
test@ubuntu:~/privateNet/node1$ geth attach geth.ipc
test@ubuntu:~/privateNet/node2$ geth attach geth.ipc
test@ubuntu:~/privateNet/node3$ geth attach geth.ipc
查看已连接节点
此时各节点已连接完成,每个节点账户默认为10个以太币,各节点账户间可自由转账和挖矿,需要注意的是转账后必须经过挖矿操作才能被写入区块链。上方法启动后的程序将会运行在后台,关闭需通过ps ax | grep geth命令和kill <process id>命令。
多机多节点私网准备- 设置上节Ubuntu虚拟机网络模式为桥接,且IP设为静态IP172.25.1.99
- Windows的IP设为静态172.25.1.55
- 在Windows下创建文件夹node4,并将fantasynetwork.json复制到其中
- 初始化节点4
C:\Users\Fantasy\Desktop\node4> geth --datadir . init fantasynetwork.json
新建账户
C:\Users\Fantasy\Desktop\node4>geth -datadir . console
> personal.newAccount("fantasy")
WARN [08-11|16:13:32.987] Please remember your password!
"0xbef61b5754ffaa843cc9199fb9a11aac468134f4"
> exit
启动节点4
geth --nousb --datadir=. --syncmode "full" --port 27271 --miner.gasprice 0 --miner.gastarget 470000000000 --http --http.addr 0.0.0.0 --http.port 7271 --http.api admin,eth,miner,net,txpool,personal,web3 --mine --allow-insecure-unlock console
添加节点1
> net.peerCount
0
> admin.addPeer("enode://0f870fa3f8085f5abf74ea7c2a12a0809a9daaece20e3b1c4c80fb6929ff652681068c6ffd47852a4544dc282a4a15f531b452e05c4f1cf6861d4fb3b728edeb@172.25.1.99:27271")
true
> net.peerCount
1
此时各节点已连接完成,各节点账户间可自由转账和挖矿,需要注意的是转账后必须经过挖矿操作才能被写入区块链。
注意事项:
- 很多教程中说不同节点启动时不能使用相同的端口,那是因为其运行在同一个主机上,这里节点1和节点4运行在不同的端口上,故可以使用相同的端口。
- 添加节点无效常见原因/解决办法:admin.addPeer后等一段时间才会生效admin.addPeer时使用的是NAT后公网地址,而公网防火墙通常拒绝异常接入admin.addPeer后开始挖矿增加同步速度简单的方法是使用上节中的static-nodes.json方法