Each node requires a data directory for the blockchain data.
Create directories for your private network, each of the four nodes, and a data directory for each node(IBFT 2.0 Requires minimum 4 nodes):
mkdir -p IBFT-Network/Node-{1..4}/data
├── Node-1
│ ├── data
├── Node-2
│ ├── data
├── Node-3
│ ├── data
└── Node-4
├── data
The configuration file defines the IBFT 2.0 genesis file and the number of node key pairs to generate.
the following configuration file definition to a file called ibftConfigFile.json
and save it in the IBFT-Network directory:
{
"genesis": {
"config": {
"chainId": 1337,
"berlinBlock": 0,
"ibft2": {
"blockperiodseconds": 2,
"epochlength": 30000,
"requesttimeoutseconds": 4
}
},
"nonce": "0x0",
"timestamp": "0x58ee40ba",
"gasLimit": "0x47b760",
"difficulty": "0x1",
"mixHash": "0x63746963616c2062797a616e74696e65206661756c7420746f6c6572616e6365",
"coinbase": "0x0000000000000000000000000000000000000000",
"alloc": {
"fe3b557e8fb62b89f4916b721be55ceb828dbd73": {
"privateKey": "8f2a55949038a9610f50fb23b5883af3b4ecb3c3bb792cbcefbd1542c692be63",
"comment": "private key and this comment are ignored. In a real chain, the private key should NOT be stored",
"balance": "0xad78ebc5ac6200000"
},
"627306090abaB3A6e1400e9345bC60c78a8BEf57": {
"privateKey": "c87509a1c067bbde78beb793e6fa76530b6382a4c0241e5e4a9ec0a0f44dc0d3",
"comment": "private key and this comment are ignored. In a real chain, the private key should NOT be stored",
"balance": "90000000000000000000000"
},
"f17f52151EbEF6C7334FAD080c5704D77216b732": {
"privateKey": "ae6ae8e5ccbfb04590405997ee2d52d2b330726137b875053c36d94e974d162f",
"comment": "private key and this comment are ignored. In a real chain, the private key should NOT be stored",
"balance": "90000000000000000000000"
}
}
},
"blockchain": {
"nodes": {
"generate": true,
"count": 4
}
}
}
In the IBFT-Network directory, generate the node key and genesis file using the configurations given in the ibftConfigFile.json file:
besu operator generate-blockchain-config --config-file=ibftConfigFile.json --to=networkFiles --private-key-file-name=key
This command will generate the public and the private key for the no of nodes given in the ibftConfigFile.json
Copy the genesis.json
file to the IBFT-Network directory.
cp networkFiles/genesis.json IBFT-Network/
For each node, copy the key files to the data directory for that node:
IBFT-Network/
├── genesis.json
├── Node-1
│ ├── data
│ │ ├── key
│ │ ├── key.pub
├── Node-2
│ ├── data
│ │ ├── key
│ │ ├── key.pub
├── Node-3
│ ├── data
│ │ ├── key
│ │ ├── key.pub
├── Node-4
│ ├── data
│ │ ├── key
│ │ ├── key.pub
In the Node-1 directory, start Node-1:
besu --data-path=data --genesis-file=../genesis.json --rpc-http-enabled --rpc-http-api=ETH,NET,IBFT --host-allowlist="*" --rpc-http-cors-origins="all"
Start another terminal, change to the corresponding Node directory and start the corresponding Node specifying the Node-1 enode URL copied when starting Node-1 as the bootnode:
besu --data-path=data --genesis-file=../genesis.json --bootnodes=<Node-1 Enode URL> --p2p-port=30304 --rpc-http-enabled --rpc-http-api=ETH,NET,IBFT --host-allowlist="*" --rpc-http-cors-origins="all" --rpc-http-port=8546
besu --data-path=data --genesis-file=../genesis.json --bootnodes=<Node-1 Enode URL> --p2p-port=30305 --rpc-http-enabled --rpc-http-api=ETH,NET,IBFT --host-allowlist="*" --rpc-http-cors-origins="all" --rpc-http-port=8547
besu --data-path=data --genesis-file=../genesis.json --bootnodes=<Node-1 Enode URL> --p2p-port=30306 --rpc-http-enabled --rpc-http-api=ETH,NET,IBFT --host-allowlist="*" --rpc-http-cors-origins="all" --rpc-http-port=8548
Start another terminal, use curl to call the JSON-RPC API ibft_getValidatorsByBlockNumber
method and confirm the network has four validators:
curl -X POST --data '{"jsonrpc":"2.0","method":"ibft_getValidatorsByBlockNumber","params":["latest"], "id":1}' localhost:8545