Start Up Nodes

Runs of geth on data directory of each nodes will use the genesis block I have defined.

I can find the networkid in genesis block metadata.

$ cd Desktop/
$ vim poaOfYen.json
{
  ...
  "chainId": 21382,
  ...
}

• Start node1

$ cd ..
$ cd Downloads/
$ ./geth --datadir /Users/yen/Desktop/node1/data -rpc --rpcapi "db,eth,net,web3,personal" --networkid 21382 --port 2000 console
INFO [08-15|11:21:37] Starting peer-to-peer node               instance=Geth/v1.6.2-unstable-ef7b9fb7/darwin-amd64/go1.8.1
INFO [08-15|11:21:37] Allocated cache and file handles         database=/Users/yen/Desktop/node1/data/geth/chaindata cache=128 handles=1024
WARN [08-15|11:21:37] Upgrading chain database to use sequential keys 
INFO [08-15|11:21:37] Initialised chain configuration          config="{ChainID: 21382 Homestead: 1 DAO: <nil> DAOSupport: false EIP150: 2 EIP155: 3 EIP158: 3 Engine: clique}"
WARN [08-15|11:21:37] Upgrading db log bloom bins 
INFO [08-15|11:21:37] Bloom-bin upgrade completed              elapsed=84.188µs
INFO [08-15|11:21:37] Initialising Ethereum protocol           versions="[63 62]" network=21382
INFO [08-15|11:21:37] Database conversion successful 
INFO [08-15|11:21:37] Loaded most recent local header          number=0 hash=7527a6…a2b0e3 td=1
INFO [08-15|11:21:37] Loaded most recent local full block      number=0 hash=7527a6…a2b0e3 td=1
INFO [08-15|11:21:37] Loaded most recent local fast block      number=0 hash=7527a6…a2b0e3 td=1
INFO [08-15|11:21:37] Starting P2P networking 
INFO [08-15|11:21:40] RLPx listener up                         self=enode://4e0bcd872eca4c3159353ac70b2a4cc1989a70f1b01fb571eb26a8d184fcaf7adc45ba5ee8fe22fd1df729c7bbeed02418646ace0209f6492c8a97db9b676bd8@192.168.1.90:2000
INFO [08-15|11:21:40] IPC endpoint opened: /Users/yen/Desktop/node1/data/geth.ipc 
INFO [08-15|11:21:40] HTTP endpoint opened: http://127.0.0.1:8545 
Welcome to the Geth JavaScript console!

instance: Geth/v1.6.2-unstable-ef7b9fb7/darwin-amd64/go1.8.1
coinbase: 0x2a7a93ca16e95a6e4478bf67e33ce3a9c20bf66d
at block: 0 (Tue, 15 Aug 2017 10:43:05 CST)
 datadir: /Users/yen/Desktop/node1/data
 modules: admin:1.0 clique:1.0 debug:1.0 eth:1.0 miner:1.0 net:1.0 personal:1.0 rpc:1.0 txpool:1.0 web3:1.0

should enable RPC with web3 for node1 . It also can unlock the account here.

JSON RPC API

• Start node2

$ ./geth --datadir /Users/yen/Desktop/node2/data  --networkid 21382 --port 2001 console

the networkid should be the same.

the port should be different, because these 2 nodes are both in local.

Add Peers

Check the connectivity on each node with below command.

$ net.peerCount
0

This private chain has no lunch node and static node, so that node1 and node2 could not find each others. I have to add node2 to node1 manually.

• find enode of node1

> admin.nodeInfo
{
  enode: "enode://4e0bcd872eca4c3159353ac70b2a4cc1989a70f1b01fb571eb26a8d184fcaf7adc45ba5ee8fe22fd1df729c7bbeed02418646ace0209f6492c8a97db9b676bd8@xxx.xxx.x.xx:2000",
  ......
}

enode://<id>@<ip>:<port>

• Use below command in console of node2

> admin.addPeer("enode://4e0bcd872eca4c3159353ac70b2a4cc1989a70f1b01fb571eb26a8d184fcaf7adc45ba5ee8fe22fd1df729c7bbeed02418646ace0209f6492c8a97db9b676bd8@127.0.0.1:2000")
true

replace the ip to localhost

• check result on console of node1

> net.peerCount
1
> admin.peers
[{
    ...
    id: "b23ca7187a5c485eb08f25bb7a73e988b24f628757f7a5cbbbacc5c3d3fd89b76390ef0a4cd9d53ca03c145b361fe95fc715b95256a0a2caef20dd3d2687a664",
    network: {
      localAddress: "127.0.0.1:2000",
      remoteAddress: "127.0.0.1:57130"
    },
    ...
}]

Starting Up Your Member Nodes at go-ethereum GitHub

Checking Connectivity at go-ethereum GitHub

Command Line Options at go-ethereum GitHub