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# Creating a Private Network
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A private network provides a configurable network for testing. By configuring a low difficulty and enabling
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mining, blocks are created quickly.
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You can test multi-block and multi-user scenarios on a private network before moving to one of the public testnets.
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!!!important
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An Ethereum private network created as described here is isolated but not protected or secure.
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We recommend running the private network behind a properly configured firewall.
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## Prerequisites
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[Pantheon](../Installation/Install-Binaries.md)
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[Curl (or similar web service client)](https://curl.haxx.se/download.html)
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## Steps
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To create a private network:
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1. [Create Folders](#1-create-folders)
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1. [Create Genesis File](#2-create-genesis-file)
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1. [Get Public Key of First Node](#3-get-public-key-of-first-node)
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1. [Start First Node as Bootnode](#4-restart-first-node-as-bootnode)
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1. [Start Additional Nodes](#5-start-additional-nodes)
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1. [Confirm Private Network Working](#6-confirm-private-network-working)
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### 1. Create Folders
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Each node requires a data directory for the blockchain data. When the node is started, the node key is saved in this directory.
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Create directories for your private network, each of the three nodes, and a data directory for each node:
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```bash
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Private-Network/
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├── Node-1
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│ ├── Node-1-Datadir
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├── Node-2
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│ ├── Node-2-Datadir
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└── Node-3
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├── Node-3-Datadir
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```
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### 2. Create Genesis File
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The genesis file defines the genesis block of the blockchain (that is, the start of the blockchain).
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The genesis file includes entries for configuring the blockchain such as the mining difficulty and initial
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accounts and balances.
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All nodes in a network must use the same genesis file.
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Copy the following genesis definition to a file called `privateNetworkGenesis.json` and save it in the `Private-Network` directory:
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```json
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{
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"config": {
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"ethash": {
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}
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},
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"nonce": "0x42",
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"gasLimit": "0x1000000",
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"difficulty": "0x10000",
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"alloc": {
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"fe3b557e8fb62b89f4916b721be55ceb828dbd73": {
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"privateKey": "8f2a55949038a9610f50fb23b5883af3b4ecb3c3bb792cbcefbd1542c692be63",
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"comment": "private key and this comment are ignored. In a real chain, the private key should NOT be stored",
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"balance": "0xad78ebc5ac6200000"
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},
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"f17f52151EbEF6C7334FAD080c5704D77216b732": {
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"privateKey": "ae6ae8e5ccbfb04590405997ee2d52d2b330726137b875053c36d94e974d162f",
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"comment": "private key and this comment are ignored. In a real chain, the private key should NOT be stored",
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"balance": "90000000000000000000000"
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}
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}
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}
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```
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!!! warning
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Do not use the accounts in the genesis file above on mainnet or any public network except for testing.
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The private keys are displayed so the accounts are not secure.
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### 3. Get Public Key of First Node
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To enable nodes to discover each other, a network requires one or more nodes to be bootnodes.
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For this private network, we will use Node-1 as the bootnode. This requires obtaining the public key for the enode URL.
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In the `Node-1` directory, use the [`export-pub-key` subcommand](../Reference/Pantheon-CLI-Syntax.md#export-pub-key) to write
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the [node public key](../Configuring-Pantheon/Node-Keys.md) to the specified file (`publicKeyNode1` in this example):
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```bash tab="MacOS"
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pantheon --datadir=Node-1-Datadir --genesis=../privateNetworkGenesis.json export-pub-key Node-1-Datadir/publicKeyNode1
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```
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```bash tab="Windows"
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pantheon --datadir=Node-1-Datadir --genesis=..\privateNetworkGenesis.json export-pub-key Node-1-Datadir\publicKeyNode1
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```
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Your node 1 directory now contains:
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```bash
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├── Node-1
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├── Node-1-Datadir
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├── database
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├── key
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├── publicKeyNode1
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```
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The `database` directory contains the blockchain data.
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### 4. Start First Node as Bootnode
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Start Node-1 specifying:
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* No arguments for the [`--bootnodes` option](../Reference/Pantheon-CLI-Syntax.md#bootnodes) because this is your bootnode.
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* Mining is enabled and the account to which mining rewards are paid using the [`--miner-enabled`](../Reference/Pantheon-CLI-Syntax.md#miner-enabled)
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and [`--miner-coinbase` options](../Reference/Pantheon-CLI-Syntax.md#miner-coinbase).
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* JSON-RPC API is enabled using the [`--rpc-enabled` option](../Reference/Pantheon-CLI-Syntax.md#rpc-enabled).
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```bash tab="MacOS"
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pantheon --datadir=Node-1-Datadir --genesis=../privateNetworkGenesis.json --bootnodes --network-id 123 --miner-enabled --miner-coinbase fe3b557e8fb62b89f4916b721be55ceb828dbd73 --rpc-enabled
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```
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```bash tab="Windows"
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pantheon --datadir=Node-1-Datadir --genesis=..\privateNetworkGenesis.json --bootnodes --network-id 123 --miner-enabled --miner-coinbase fe3b557e8fb62b89f4916b721be55ceb828dbd73 --rpc-enabled
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```
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!!! info
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The miner coinbase account is one of the accounts defined in the genesis file.
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### 5. Start Additional Nodes
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You need the enode URL for Node-1 to specify Node-1 as the bootnode for Node-2 and Node-3.
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The enode URL is `enode://<id>@<host:port>` where:
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* `<id>` is the node public key excluding the initial 0x. The node public node for Node-1 was written to `publicKeyNode1` in [step 3](#3-start-first-node-and-get-node-public-key).
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* `<host:port>` is the host and port the bootnode is listening on for P2P peer discovery. Node-1 is using the default host and port of `127.0.0.1:30303`.
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!!! example
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If the default host and port are used for P2P peer discovery and the node public key exported is: `0xc35c3ec90a8a51fd5703594c6303382f3ae6b2ecb9589bab2c04b3794f2bc3fc2631dabb0c08af795787a6c004d8f532230ae6e9925cbbefb0b28b79295d615f`
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The enode URL is:
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`enode://c35c3ec90a8a51fd5703594c6303382f3ae6b2ecb9589bab2c04b3794f2bc3fc2631dabb0c08af795787a6c004d8f532230ae6e9925cbbefb0b28b79295d615f@127.0.0.1:30303`
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Start another terminal, change to the `Node-2` directory and start Node-2 specifying:
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* Different port to Node-1 for P2P peer discovery using the [`--p2p-listen` option](../Reference/Pantheon-CLI-Syntax.md#p2p-listen).
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* Enode URL for Node-1 using the [`--bootnodes` option](../Reference/Pantheon-CLI-Syntax.md#bootnodes).
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* Data directory for Node-2 using the [`--datadir` option](../Reference/Pantheon-CLI-Syntax.md#datadir).
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* Genesis file and network ID as for Node-1.
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```bash tab="MacOS"
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pantheon --datadir=Node-2-Datadir --genesis=../privateNetworkGenesis.json --bootnodes="enode://<node public key ex 0x>@127.0.0.1:30303" --network-id 123 --p2p-listen=127.0.0.1:30304
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```
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```bash tab="Windows"
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pantheon --datadir=Node-2-Datadir --genesis=..\privateNetworkGenesis.json --bootnodes="enode://<node public key ex 0x>@127.0.0.1:30303" --network-id 123 --p2p-listen=127.0.0.1:30304
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```
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Start another terminal, change to the `Node-3` directory and start Node-3 specifying:
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* Different port to Node-1 and Node-2 for P2P peer discovery.
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* Data directory for Node-3 using the [`--datadir` option](../Reference/Pantheon-CLI-Syntax.md#datadir).
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* Bootnode, genesis file, and network ID as for Node-2.
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```bash tab="MacOS"
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pantheon --datadir=Node-3-Datadir --genesis=../privateNetworkGenesis.json --bootnodes="enode://<node public key ex 0x>@127.0.0.1:30303" --network-id 123 --p2p-listen=127.0.0.1:30305
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```
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```bash tab="Windows"
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pantheon --datadir=Node-3-Datadir --genesis=..\privateNetworkGenesis.json --bootnodes="enode://<node public key ex 0x>@127.0.0.1:30303" --network-id 123 --p2p-listen=127.0.0.1:30305
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```
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### 6. Confirm Private Network is Working
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Start another terminal, use curl to call the JSON-RPC API [`net_peerCount`](../Reference/JSON-RPC-API-Methods.md#net_peercount) method and confirm the nodes are functioning as peers:
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```bash
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curl -X POST --data '{"jsonrpc":"2.0","method":"net_peerCount","params":[],"id":1}' 127.0.0.1:8545
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```
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The result confirms Node-1 (the node running the JSON-RPC service) has two peers (Node-2 and Node-3):
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```json
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{
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"jsonrpc" : "2.0",
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"id" : 1,
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"result" : "0x2"
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}
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```
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## Next Steps
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Import accounts to MetaMask and send transactions as described in the [Private Network Quickstart Tutorial](../Getting-Started/Private-Network-Quickstart.md#creating-a-transaction-using-metamask)
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!!! info
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Pantheon does not implement [private key management](../Using-Pantheon/Account-Management.md).
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Send transactions using `eth_sendRawTransaction` to [send ether or, deploy or invoke contracts](../Using-Pantheon/Transactions.md).
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Use the [JSON-RPC API](../Reference/Using-JSON-RPC-API.md).
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Start a node with the `--ws-enabled` option and use the [RPC Pub/Sub API](../Using-Pantheon/RPC-PubSub.md).
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## Stop Nodes
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When finished using the private network, stop all nodes using ++ctrl+c++ in each terminal window.
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!!!tip
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To restart the private network in the future, start from [4. Restart First Node as Bootnode](#4-restart-first-node-as-bootnode). |
