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An enterprise-grade Java-based, Apache 2.0 licensed Ethereum client https://wiki.hyperledger.org/display/besu
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besu/docs/Configuring-Pantheon/Testing-Developing-Nodes.md

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description: Pantheon Clique Proof-of-Authority (PoA) consensus protocol implementation path: blob/master/ethereum/core/src/main/resources/ source: rinkeby.json

Testing and Developing Nodes

Bootnodes

Bootnodes are used to initially discover peers.

Mainnet and Public Testnets

For mainnet and Rinkeby, Pantheon predefines a list of enonde URLs. For Ropsten, bootnodes are specified using the --bootnodes option.

Private Networks

To start a bootnode for a private network:

  1. Export the public key to a file:

    !!! example bash pantheon export-pub-key bootnode The node public key is exported to the bootnode file.

  2. Start the bootnode, specifying:

    • An empty string for the --bootnodes option because this is the bootnode.
    • The network ID for your private network.

    !!! example bash pantheon --bootnodes="" --network-id 123

To specify this bootnode for another node, the enode URL for the --bootnodes option is enode://<id>@<host:port> where:

  • <id> is the node public key written to the specified file (bootnode in the above example) excluding the initial 0x.
  • <host:port> is the host and port the bootnode is listening on for P2P peer discovery. Specified by the --p2p-listen option for the bootnode (default is 127.0.0.1:30303).

!!! example If the --p2p-listen option is not specified and the node public key exported is 0xc35c3ec90a8a51fd5703594c6303382f3ae6b2ecb9589bab2c04b3794f2bc3fc2631dabb0c08af795787a6c004d8f532230ae6e9925cbbefb0b28b79295d615f

Then the enode URL is:
`enode://c35c3ec90a8a51fd5703594c6303382f3ae6b2ecb9589bab2c04b3794f2bc3fc2631dabb0c08af795787a6c004d8f532230ae6e9925cbbefb0b28b79295d615f@127.0.0.1:30303`

!!! info The default host and port for P2P peer discovery is 127.0.0.1:30303. The --p2p-listen option can be used to specify a host and port.

To start a node specifying the bootnode for P2P discovery:

!!! example bash pantheon --datadir=/tmp/pantheon/30301 --p2p-listen=127.0.0.1:30301 --network-id=123 --bootnodes=enode://c35c3ec90a8a51fd5703594c6303382f3ae6b2ecb99bab2c04b3794f2bc3fc2631dabb0c08af795787a6c004d8f532230ae6e9925cbbefb0b28b79295d615f@127.0.0.1:30303