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How to setup a Nethermind only Spaceneth based chain

Spaceneth private network setup looks very similar to the above Clique setup. However, there are few major differences and will be described below.

Prerequisites

  • Linux bash shell
  • Docker-compose
  • Docker
  • jq
  • Nethermind.Cli
sudo apt-get install -y docker-compose docker.io jq

Setup

In this setup we will create a private network of 3 Nethermind nodes running a simple testing NethDev consensus algorithm.

  • create separate directory where we will store all files
mkdir private-networking
cd private-networking
  • create folders for each node and genesis
mkdir node_1 node_2 node_3 genesis
  • download chainspec file with spaceneth engine and place it in genesis folder.
wget https://raw.githubusercontent.com/NethermindEth/nethermind/master/src/Nethermind/Chains/spaceneth.json
cp spaceneth.json genesis/spaceneth.json
  • create subfolders in each node folder
mkdir node_1/configs node_1/staticNodes node_2/configs node_2/staticNodes node_3/configs node_3/staticNodes
  • create a static-nodes.json file and place it in node_1/staticNodes subfolders (do this for node_2 and node_3 as well)
cat <<EOF > node_1/staticNodes/static-nodes.json
[

]
EOF
  • create config.cfg file and place it in node_1/configs subfolders (do this for node_2 and node_3 as well)
cat <<EOF > node_1/configs/config.cfg
{
    "Init": {
        "WebSocketsEnabled": false,
        "StoreReceipts" : true,
        "EnableUnsecuredDevWallet": true,
        "IsMining": true,
        "ChainSpecPath": "/config/genesis/spaceneth.json",
        "BaseDbPath": "nethermind_db/spaceneth",
        "LogFileName": "spaceneth.logs.txt",
        "StaticNodesPath": "Data/static-nodes.json"
    },
    "Network": {
        "DiscoveryPort": 30300,
        "P2PPort": 30300,
        "LocalIp": "10.5.0.2",
        "ExternalIp": "10.5.0.2"
    },
    "JsonRpc": {
        "Enabled": true,
        "Host": "10.5.0.2",
        "Port": 8545
    }
}
EOF

For each node you will need to change following items in configuration:

  • LocalIp, ExternalIp and Host should have the same value and be incremented for each node e.g. 10.5.0.3, 10.5.0.4 and so on and so forth.

  • copy docker-compose file and place it in working directory
version: "3.5"
services:

    node_1:
        image: nethermind/nethermind
        command: --config config
        volumes:
            - ./genesis:/config/genesis
            - ./node_1/configs/config.cfg:/nethermind/configs/config.cfg
            - ./node_1/staticNodes/static-nodes.json:/nethermind/Data/static-nodes.json
            - ./node_1/db/spaceneth:/nethermind/nethermind_db/spaceneth
            - ./node_1/keystore:/nethermind/keystore
        ports:
            - 0.0.0.0:8547:8545
        networks:
            vpcbr:
                ipv4_address: 10.5.0.2

    node_2:
        image: nethermind/nethermind
        command: --config config
        volumes:
            - ./genesis:/config/genesis
            - ./node_2/configs/config.cfg:/nethermind/configs/config.cfg
            - ./node_2/staticNodes/static-nodes.json:/nethermind/Data/static-nodes.json
            - ./node_2/db/spaceneth:/nethermind/nethermind_db/spaceneth
            - ./node_2/keystore:/nethermind/keystore
        ports:
            - 0.0.0.0:8548:8545
        networks:
            vpcbr:
                ipv4_address: 10.5.0.3

    node_3:
        image: nethermind/nethermind
        command: --config config
        volumes:
            - ./genesis:/config/genesis
            - ./node_3/configs/config.cfg:/nethermind/configs/config.cfg
            - ./node_3/staticNodes/static-nodes.json:/nethermind/Data/static-nodes.json
            - ./node_3/db/spaceneth:/nethermind/nethermind_db/spaceneth
            - ./node_3/keystore:/nethermind/keystore
        ports:
            - 0.0.0.0:8549:8545
        networks:
            vpcbr:
                ipv4_address: 10.5.0.4

networks:
    vpcbr:
        driver: bridge
        ipam:
            config:
                - subnet: 10.5.0.0/16
  • run each node separately so that we can copy Enode for each node, we will use them later
docker-compose run node_1

Stop the node when Nethermind initialization completes Ctrl +C. Copy This node values to a text file. Continue with node_2 and node_3.

{% hint style="info" %} You can use Nethermind.Cli to fetch these values from nodes by executing the following.
Nethermind.Cli can be found in packages on Github Releases or Download Page. {% endhint %}

node.switch("http://localhost:8547")
node.enode
  • the file should look similar to this:
STATIC_NODE_1="enode://2281549869465d98e90cebc45e1d6834a01465a990add7bcf07a49287e7e66b50ca27f9c70a46190cef7ad746dd5d5b6b9dfee0c9954104c8e9bd0d42758ec58@10.5.0.2:30300"
STATIC_NODE_2="enode://37878ec16a5ed87c9c80b4648e5428f5c768eddd79483be118319c49d11c4e535dac328b5216696cefe0792b7b64adc4de3aeb377550651e982590e62e5a500e@10.5.0.3:30300"
STATIC_NODE_3="enode://6067f06d84c207e6233dacf1f3ef961bd7231f71d5425cbaf843cf19cfd5f7e13b024d234e4e5f6175bdb37c0bbccd14488b481b2280efb66d0631a20ae13ea3@10.5.0.4:30300"
  • copy & paste above variables into your terminal
  • for each node modify previously created empty static-nodes.json files by appending Enodes to them
cat <<EOF > node_1/staticNodes/static-nodes.json
[
    "$STATIC_NODE_1",
    "$STATIC_NODE_2",
    "$STATIC_NODE_3"
]
EOF

  • remove databases for each node
sudo rm -rf node_1/db/spaceneth node_2/db/spaceneth node_3/db/spaceneth
  • run docker-compose file
docker-compose up

You should see the private network working. We now need to send transactions in order to start producing blocks.

  • run Nethermind.Cli
  • run node.switch("http://localhost:8547")
  • run personal.listAccounts
  • create new account personal.newAccount("test")

  • re-run personal.listAccounts and copy your account address
  • trigger blocks producing by sending transaction using eth_sendTransactionJSON RPC method or Nethermind.Cli. Change from property to your account address
curl --data '{"jsonrpc":"2.0","method":"eth_sendTransaction","params":[{
    "from": "0x89892f2c746d98cf270ff2a76672e493d9731c24",
    "to": "0xe1ab8145f7e55dc933d51a18c793f901a3a0b276",
    "gas": "0x76c0",
    "gasPrice": "0x9184e72a000",
    "value": "0x9184e72a",
    "data": "0xd46e8dd67c5d32be8d46e8dd67c5d32be8058bb8eb970870f072445675058bb8eb970870f072445675"
}],"id":0}' -H "Content-Type: application/json" -X POST localhost:8547