Block chain Learning (iii) building the private chain environment __linux of the ether square under Linux

Reference article address: http://blog.csdn.net/sportshark/article/details/51855007

Build Environment: Ubuntu

Specific installation can refer to the official guide:

Https://github.com/ethereum/Go-ethereum/wiki/Building-Ethereum

One: Enter the Ubuntu terminal command line:

Enter separately:

sudo apt-get Installsoftware-properties-common

sudo add-apt-repository-yppa:ethereum/ethereum

sudo add-apt-repository-yppa:ethereum/ethereum-dev

sudo apt-get update

sudo apt-get install Ethereum

System networking After the completion of the command will complete the installation, after the installation, enter the Geth command, you can see the Geth started information (connected to the public chain). or enter Geth--help

If you are realistic about the various parameter prompts for the command line, the installation is successful.

Note: If there is an error during the installation, do not lose heart in the rush to give up, read its error message, and then fix it, and then continue the installation, generally error is due to the need to rely on other components, the first installation of other components.

II: Genesis BLOCK:

After the above installation is successful, direct start, you can connect the public chain. Now create a private chain by configuring the creation block. In the same network, the creation block must be the same, otherwise it cannot be unicom.

Create a ETH root directory folder that creates a new creation block JSON file Piccgenesis.json under the root directory. The contents are as follows:

{

"Nonce": "0x0000000000000042",

"Mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000",

"Difficulty": "0x4000",

"Alloc": {},

"Coinbase": "0x0000000000000000000000000000000000000000",

"Timestamp": "0x00",

"Parenthash": "0x0000000000000000000000000000000000000000000000000000000000000000",

"Extradata": "Secbroblock",

"Gaslimit": "0x0000FFFF"

}

Parameter explanation:

Mixhash is used in conjunction with nonce to excavate a hash generated by a portion of the previous block. Note that his and nonce settings need to meet the yellow paper of the etheric Square, 4.3.4. Block Header validity, (44) The conditions described in the section.

Nonce Nonce is a 64-bit random number used to dig mines, noting that his and mixhash settings need to meet the yellow paper of the etheric Square, 4.3.4. Block Header validity, (44) The conditions described in the section.

Difficulty the difficulty of setting the current block, if the difficulty is too big, the CPU digs the mine to be very difficult, here sets up the minor difficulty

Alloc used to preset accounts and account number of the etheric currency, because the private chain mining is easier, so we do not need to preset a currency account, when needed to create their own.

Coinbase Miner's account number, fill in

Timestamp set the time stamp of the Genesis block

Parenthash the hash value of a block, because it is a Genesis block, so this value is 0

Extradata additional information, casually fill in, you can fill in your personality information

Gaslimit This value sets the total consumption limit of gas to limit the sum of the transaction information that the block can contain, because we are the private chain, so fill in the maximum.

Switch to the directory where you just stored Piccgenesis.json: Execute the following command:

basepath=$ (CD ' DirName $ '; pwd)

Get the current directory

Geth--datadir "$basepath/chain" Init Piccgenesis.json

Create data store address and initialize Genesis block

Geth--identity "Piccetherum" –rpc--rpccorsdomain "--datadir" $basepath/chain "--port" 30303 "--rpcapi" db,eth,net, Web3 "--networkid 95518console

Command explanation:

Parameter Name parameter description

Identify the chain of identity blocks, fill them out, and use them to indicate the name of the current network

INIT specifies the location of the creation block file and creates the initial block

DataDir sets the location of the current block chain network data storage

Port Network listening ports

RPC initiates RPC communication, which enables deployment and debugging of smart contracts

RPCAPI sets the client that allows the RPC to be connected, typically DB,ETH,NET,WEB3

Networkid sets the network ID of the current block chain to differentiate between different networks, a number

Console starts command line mode and can execute commands in Geth

Startup success is as follows:

After the node is started, the Geth command line mode is entered, and the input personal.newaccount () will give you a new account if prompted to enter the password.

Third: Connect other nodes:

Five: Connect to other nodes:

First to know your own node information, in the Geth command line interface to enter commands, attention to case

Admin.nodeinfo

The system will show

Enode: "enode:// 1e3c1727cd3bee9f25edeb5dbb3b880e03e41f8eec99566557f3ee0422734a8fcad17c161aa93d61bdbfb28ed152c143c7eb501db58bc63502a104a84 b62d742@0.0.0.0:30303 "

which

enode:// 1e3c1727cd3bee9f25edeb5dbb3b880e03e41f8eec99566557f3ee0422734a8fcad17c161aa93d61bdbfb28ed152c143c7eb501db58bc63502a104a84 b62d742@0.0.0.0:30303

Is the information of their own nodes, pay attention to the "0.0.0.0" into your own IP. Send this information to the other node and enter it on the command line of the other node:

Admin.addpeer (' enode:// 1e3c1727cd3bee9f25edeb5dbb3b880e03e41f8eec99566557f3ee0422734a8fcad17c161aa93d61bdbfb28ed152c143c7eb501db58bc63502a104a84 b62d742@192.168.1.101:30303 ')

If the addition succeeds, the input admin.peers displays the newly added node.

Six:

The command to begin mining:

Miner.start ()

End Ore Digging:

Miner.stop ()