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.
Could not load image
  • 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.
Could not load image
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.
node.switch("http://localhost:8547")
node.enode
  • the file should look similar to this:
STATIC_NODE_1="enode://2281549869465d98e90cebc45e1d6834a01465a990add7bcf07a49287e7e66b50[email protected]10.5.0.2:30300"
STATIC_NODE_2="enode://37878ec16a5ed87c9c80b4648e5428f5c768eddd79483be118319c49d11c4e535[email protected]10.5.0.3:30300"
STATIC_NODE_3="enode://6067f06d84c207e6233dacf1f3ef961bd7231f71d5425cbaf843cf19cfd5f7e13[email protected]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
Could not load image
  • 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")
Could not load image
  • 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
Could not load image
Copy link
On this page
Prerequisites
Setup