setting up single/multi node Ethereum

Mining

1. miner.start(true)
2. miner.stop()
3. eth.blockNumber (this returns the id of last/latest block of ethereum)
4. eth.getBalance (to view the miner's account balance)
5. eth.getBlock(eth.blockNumber).miner (returns the id of the last/latest block miner)
6. eth.getBalance(eth.getBlock(eth.blockNumber).miner)

Multi-Node

1. start the first node using above logic (please remember to add networkid).Networkid can be anything.

 `./build/bin/geth --datadir=DATADIR1/data init "GENESIS/genesis.json" --networkid=1234 --ipcpath=DATADIR1/data/geth.ipc`
    
2. now run the second node using below command.
   `./build/bin/geth --datadir=DATADIR2/data init "GENESIS/genesis.json"  -port 30304 --nodiscover --networkid=1234 --ipcpath=DATADIR1/data/geth.ipc`
   
3. run `admin.nodeInfo` and copy the enode value.

4. go to first node console and run admin.addPeer("enode_value").

5. then verify `admin.peers` to validate the list of peers in both nodes.

Single Node

1. export ETHEREUM_HOME = <Directory ethereum is installed>

2. create genesis.json and store it in genesis(i.e.,GENESIS) folder

3. start the single ethereum node
    `./build/bin/geth --datadir=DATADIR1/data init "GENESIS/genesis.json"`
    
4. to attach the console to the existing geth
    `./build/bin/geth --datadir=DATADIR1/data console 2>console1.log`
    
5. In console try 
    a.) admin.nodeInfo
    b.) personal.newAccount()
    c.) personal.listAccounts()
    
6. Come out of geth console and stay in the same directory.

7. open a new terminal and then run
  geth attach ipc:DATADIR1/data/gethipc
  This command with attach any new terminal to the one already running on the console.
  
8. data of the node would be stored at `DATADIR1/data/geth/chaindata/*.ldb`