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description: Pantheon IBFT 2.0 Proof-of-Authority (PoA) private network tutorial
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<!--- END of page meta data -->
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*[Byzantine fault tolerant]: Ability to function correctly and reach consensus despite nodes failing or propagating incorrect information to peers.
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# Creating a Private Network using IBFT 2.0 (Proof of Authority) Consensus Protocol
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A private network provides a configurable network for testing. This private network uses the [IBFT 2.0 (Proof of Authority)
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consensus protocol](../Consensus-Protocols/IBFT.md).
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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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This tuturial configures a private network using IBFT 2.0 for education purposes only. IBFT 2.0 requires
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4 validators to be Byzantine fault tolerant.
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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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The steps to create a private network using IBFT 2.0 with three nodes and one initial validator are displayed
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on the right.
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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](../Configuring-Pantheon/Node-Keys.md) 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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IBFT-Network/
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├── Node-1
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│ ├── data
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├── Node-2
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│ ├── data
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└── Node-3
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├── data
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```
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### 2. Get Node Addresses
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In IBFT 2.0 networks, the address of at least one initial validator must be included in the genesis file in the
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RLP encoded `extraData` string. For this network, we will use Node-1 as the initial validator. This requires obtaining the address for Node-1.
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To obtain the address for Node-1, in the `Node-1` directory, use the [`public-key export-address`](../Reference/Pantheon-CLI-Syntax.md#public-key)
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subcommand to write the node address to the specified file (`nodeAddress`)
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```bash tab="MacOS"
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pantheon --data-path=data public-key export-address --to=data/nodeAddress
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```
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```bash tab="Windows"
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pantheon --data-path=data public-key export-address --to=data\nodeAddress
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```
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To vote in validators once the network is running, the node address for the proposed validator is required. In the `Node-2`
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and `Node-3` directories, write the node address for each node to the specified file using the `public-key export-address`
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command as for `Node-1`.
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### 3. Create JSON File to RLP Encode
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Create a file called `toEncode.json` in the `IBFT-Network` directory that contains the [Node 1 address excluding the 0x prefix](#3-get-node-addresses)
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from the `nodeAddress` file in the `Node-1/data` directory:
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```json tab="toEncode.json"
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[
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"<Node 1 Address>"
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]
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```
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```json tab="Example"
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[
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"9b9f91039843450927b0043ae71cd803e0db0c30"
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]
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```
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### 4. RLP Encode Extra Data
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The `extraData` property in IBFT 2.0 genesis files is an RLP encoding of `[32 Bytes Vanity, List<Validators>, No Vote, Round=Int(0), 0 Seals]`.
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In the `IBFT-Network` directory, use the Pantheon subcommand [`rlp encode`](../Reference/Pantheon-CLI-Syntax.md#rlp) to generate the `extraData`
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RLP string to include in the genesis file.
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```bash tab="MacOS"
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pantheon rlp encode --from=toEncode.json --to=rlpEncodedExtraData
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```
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```bash tab="Windows"
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pantheon rlp encode --from=toEncode.json --to=rlpEncodedExtraData
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```
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### 5. 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 [IBFT 2.0 genesis file](../Consensus-Protocols/IBFT.md#genesis-file) includes the address of Node-1 as the initial validator in the
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RLP encoded `extraData` string.
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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 `ibftGenesis.json` and save it in the `IBFT-Network` directory:
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```json
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{
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"config": {
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"chainId": 2018,
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"constantinoplefixblock": 0,
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"ibft2": {
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"blockperiodseconds": 2,
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"epochlength": 30000,
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"requesttimeoutseconds": 10
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}
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},
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"nonce": "0x0",
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"timestamp": "0x58ee40ba",
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"extraData": "<RLP Encoded Extra Data>",
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"gasLimit": "0x47b760",
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"difficulty": "0x1",
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"mixHash": "0x63746963616c2062797a616e74696e65206661756c7420746f6c6572616e6365",
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"coinbase": "0x0000000000000000000000000000000000000000",
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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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"627306090abaB3A6e1400e9345bC60c78a8BEf57": {
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"privateKey": "c87509a1c067bbde78beb793e6fa76530b6382a4c0241e5e4a9ec0a0f44dc0d3",
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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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"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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In `extraData`, copy the [RLP encoded data](#5-rlp-encode-extra-data) from the `rlpEncodedExtraData` file.
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!!! example
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```json
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{
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...
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"extraData":"0xf83ea00000000000000000000000000000000000000000000000000000000000000000d5949b9f91039843450927b0043ae71cd803e0db0c30808400000000c0",
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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 `alloc` in the genesis file on mainnet or any public network except for testing.
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The private keys are displayed which means the accounts are not secure.
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### 6. Start First Node as Bootnode
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In the `Node-1` directory, start Node-1:
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```bash tab="MacOS"
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pantheon --data-path=data --genesis-file=../ibftGenesis.json --rpc-http-enabled --rpc-http-api=ETH,NET,IBFT --host-whitelist=* --rpc-http-cors-origins="all"
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```
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```bash tab="Windows"
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pantheon --data-path=data --genesis-file=..\ibftGenesis.json --rpc-http-enabled --rpc-http-api=ETH,NET,IBFT --host-whitelist=* --rpc-http-cors-origins="all"
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```
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!!!note
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The [`--genesis-file`](../Reference/Pantheon-CLI-Syntax.md#genesis-file) option is not used when running
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Pantheon from the [Docker image](../Getting-Started/Run-Docker-Image.md). Use a bind mount to
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[specify a configuration file with Docker](../Getting-Started/Run-Docker-Image.md#custom-genesis-file).
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The command line specifies:
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* Data directory for Node-1 using the [`--data-path`](../Reference/Pantheon-CLI-Syntax.md#data-path) option.
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* JSON-RPC API is enabled using the [`--rpc-http-enabled`](../Reference/Pantheon-CLI-Syntax.md#rpc-http-enabled) option
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* ETH,NET, and IBFT APIs are enabled using the [`--rpc-http-api`](../Reference/Pantheon-CLI-Syntax.md#rpc-http-api) option
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* All hosts can access the HTTP JSON-RPC API using the [`--host-whitelist`](../Reference/Pantheon-CLI-Syntax.md#host-whitelist) option
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* All domains can access the node using the HTTP JSON-RPC API using the [`--rpc-http-cors-origins`](../Reference/Pantheon-CLI-Syntax.md#rpc-http-cors-origins) option
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When the node starts, the [enode URL](../Configuring-Pantheon/Node-Keys.md#enode-url) is displayed.
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Copy the enode URL to specify Node-1 as the bootnode in the following steps.
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### 7. Start Node-2
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Start another terminal, change to the `Node-2` directory and start Node-2 specifying the Node-1 enode URL copied when starting Node-1 as the bootnode:
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```bash tab="MacOS"
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pantheon --data-path=data --genesis-file=../ibftGenesis.json --bootnodes=<Node-1 Enode URL> --p2p-port=30304 --rpc-http-enabled --rpc-http-api=ETH,NET,IBFT --host-whitelist=* --rpc-http-cors-origins="all" --rpc-http-port=8546
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```
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```bash tab="Windows"
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pantheon --data-path=data --genesis-file=..\ibftGenesis.json --bootnodes=<Node-1 Enode URL> --p2p-port=30304 --rpc-http-enabled --rpc-http-api=ETH,NET,IBFT --host-whitelist=* --rpc-http-cors-origins="all" --rpc-http-port=8546
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```
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The command line specifies:
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* Data directory for Node-2 using the [`--data-path`](../Reference/Pantheon-CLI-Syntax.md#data-path) option.
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* Different port to Node-1 for P2P peer discovery using the [`--p2p-port`](../Reference/Pantheon-CLI-Syntax.md#p2p-port) option.
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* Different port to Node-1 for HTTP JSON-RPC using the [`--rpc-http-port`](../Reference/Pantheon-CLI-Syntax.md#rpc-http-port) option.
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* Enode URL for Node-1 using the [`--bootnodes`](../Reference/Pantheon-CLI-Syntax.md#bootnodes) option.
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* Other options as for [Node-1](#5-start-first-node-as-bootnode).
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### 8. Start Node-3
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Start another terminal, change to the `Node-3` directory and start Node-3 specifying the Node-1 enode URL copied when starting Node-1 as the bootnode:
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```bash tab="MacOS"
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pantheon --data-path=data --genesis-file=../ibftGenesis.json --bootnodes=<Node-1 Enode URL> --p2p-port=30305 --rpc-http-enabled --rpc-http-api=ETH,NET,IBFT --host-whitelist=* --rpc-http-cors-origins="all" --rpc-http-port=8547
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```
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```bash tab="Windows"
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pantheon --data-path=data --genesis-file=..\ibftGenesis.json --bootnodes=<Node-1 Enode URL> --p2p-port=30305 --rpc-http-enabled --rpc-http-api=ETH,NET,IBFT --host-whitelist=* --rpc-http-cors-origins="all" --rpc-http-port=8547
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```
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The command line specifies:
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* Data directory for Node-3 using the [`--data-path`](../Reference/Pantheon-CLI-Syntax.md#data-path) option.
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* Different port to Node-1 and Node-2 for P2P peer discovery using the [`--p2p-port`](../Reference/Pantheon-CLI-Syntax.md#p2p-port) option.
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* Different port to Node-1 and Node-2 for HTTP JSON-RPC using the [`--rpc-http-port`](../Reference/Pantheon-CLI-Syntax.md#rpc-http-port) option.
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* Bootnode as for [Node-2](#6-start-node-2).
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* Other options as for [Node-1](#5-start-first-node-as-bootnode).
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### 9. Confirm Private Network is Working
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Start another terminal, use curl to call the JSON-RPC API [`net_peerCount`](../Reference/Pantheon-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}' localhost:8545
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```
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The result confirms Node-1 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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Look at the logs displayed to confirm Node-1 is producing blocks and Node-2 and Node-3 are importing blocks.
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Use the [IBFT API to add](../Consensus-Protocols/IBFT.md#adding-and-removing-validators) Node-2 or Node-3 as a validator.
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!!! note
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To add Node-2 or Node-3 as a validator you need the [node address as when specifying Node-1](#2-get-address-for-node-1) as the initial validator.
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Import accounts to MetaMask and send transactions as described in the [Private Network Quickstart Tutorial](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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## 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 IBFT 2.0 network in the future, start from [6. Start First Node as Bootnode](#6-start-first-node-as-bootnode).
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