本地私有鏈搭建

在搭建私有鏈之前需要安裝geth

Version: 1.10.1-stable  //我的geth版本

創建檔案夾以保存檔案

創建如下的檔案目錄

/myChain
├── chainlink
└── localChain
    ├── node1

在node1下輸入命令創建賬戶，輸入并記住密碼

sudo geth --datadir ./ account new   //賬戶用于后面填入初始以太的賬戶

呼叫puppeth創建私有鏈創世紀檔案，配置方法可參考如下

• 要選擇Clique - proof-of-authority配置創建POA鏈
• 要設定Which accounts should be pre-funded? (advisable at least one)填入上面創建的賬戶地址用于設定初始的以太
• Which accounts are allowed to seal? (mandatory at least one)設定初始的挖礦賬戶，依舊填入上面創建的賬戶

+-----------------------------------------------------------+
| Welcome to puppeth, your Ethereum private network manager |
|                                                           |
| This tool lets you create a new Ethereum network down to  |
| the genesis block, bootnodes, miners and ethstats servers |
| without the hassle that it would normally entail.         |
|                                                           |
| Puppeth uses SSH to dial in to remote servers, and builds |
| its network components out of Docker containers using the |
| docker-compose toolset.                                   |
+-----------------------------------------------------------+

Please specify a network name to administer (no spaces, hyphens or capital letters please)
> testChain
ERROR[04-09|13:47:08.779] I also like to live dangerously, still no spaces, hyphens or capital letters 
> testchain

Sweet, you can set this via --network=testchain next time!

INFO [04-09|13:47:19.771] Administering Ethereum network           name=testchain
WARN [04-09|13:47:19.771] No previous configurations found         path=/root/.puppeth/testchain

What would you like to do? (default = stats)
 1. Show network stats
 2. Configure new genesis
 3. Track new remote server
 4. Deploy network components
> 2

What would you like to do? (default = create)
 1. Create new genesis from scratch
 2. Import already existing genesis
> 1

Which consensus engine to use? (default = clique)
 1. Ethash - proof-of-work
 2. Clique - proof-of-authority
> 2

How many seconds should blocks take? (default = 15)
> 5 

Which accounts are allowed to seal? (mandatory at least one)
> 0x24829d5D928c9f1aE2B8eFC13a24C42b6EB1846D
> 0x

Which accounts should be pre-funded? (advisable at least one)
> 0x24829d5D928c9f1aE2B8eFC13a24C42b6EB1846D
> 0x

Should the precompile-addresses (0x1 .. 0xff) be pre-funded with 1 wei? (advisable yes)
> 

Specify your chain/network ID if you want an explicit one (default = random)
> 
INFO [04-09|13:49:02.108] Configured new genesis block 

What would you like to do? (default = stats)
 1. Show network stats
 2. Manage existing genesis
 3. Track new remote server
 4. Deploy network components
> 2

 1. Modify existing configurations
 2. Export genesis configurations
 3. Remove genesis configuration
> 2

Which folder to save the genesis specs into? (default = current)
  Will create testchain.json, testchain-aleth.json, testchain-harmony.json, testchain-parity.json
> testchain
INFO [04-09|13:49:30.973] Saved native genesis chain spec          path=testchain.json/testchain.json
ERROR[04-09|13:49:30.973] Failed to create Aleth chain spec        err="unsupported consensus engine"
ERROR[04-09|13:49:30.973] Failed to create Parity chain spec       err="unsupported consensus engine"
INFO [04-09|13:49:30.975] Saved genesis chain spec                 client=harmony path=testchain.json/testchain-harmony.json

What would you like to do? (default = stats)
 1. Show network stats
 2. Manage existing genesis
 3. Track new remote server
 4. Deploy network components
> ^C

完成上面的步驟后，可以得到testchain.json這個檔案，這就是創建私有鏈所需要的創世紀檔案

初始化私有鏈

在node1下初始化

sudo geth --datadir ./ init testchain.json 

配置成功如下

INFO [04-09|14:04:53.526] Maximum peer count                       ETH=50 LES=0 total=50
INFO [04-09|14:04:53.526] Smartcard socket not found, disabling    err="stat /run/pcscd/pcscd.comm: no such file or directory"
INFO [04-09|14:04:53.527] Set global gas cap                       cap=25000000
INFO [04-09|14:04:53.527] Allocated cache and file handles         database=/myChain/localChain/run/geth/chaindata cache=16.00MiB handles=16
INFO [04-09|14:04:53.534] Writing custom genesis block 
INFO [04-09|14:04:53.563] Persisted trie from memory database      nodes=355 size=50.43KiB time=2.522668ms gcnodes=0 gcsize=0.00B gctime=0s livenodes=1 livesize=0.00B
INFO [04-09|14:04:53.564] Successfully wrote genesis state         database=chaindata                              hash="7304a9…c1e849"
INFO [04-09|14:04:53.564] Allocated cache and file handles         database=/myChain/localChain/run/geth/lightchaindata cache=16.00MiB handles=16
INFO [04-09|14:04:53.568] Writing custom genesis block 
INFO [04-09|14:04:53.582] Persisted trie from memory database      nodes=355 size=50.43KiB time=2.078084ms gcnodes=0 gcsize=0.00B gctime=0s livenodes=1 livesize=0.00B
INFO [04-09|14:04:53.583] Successfully wrote genesis state         database=lightchaindata                         hash="7304a9…c1e849"

啟動geth

sudo geth --datadir ./ --networkid 47505  --allow-insecure-unlock console

此處的47505是創建puppeth創世紀塊中可以自己指定也可隨機生成的，若是隨機生成需要在testchain.json中查看networkid

到此為止，私有鏈就創建完畢了，下一步搭建在本地的chainlink節點

Chainlink節點

需要安裝Docker 、PostgreSQL

Docker version 20.10.5, build 55c4c88   //我的docker版本

psql (PostgreSQL) 12.6 (Ubuntu 12.6-0ubuntu0.20.04.1)  // 我的psql版本

配置PostgreSQL

安裝PostgreSQL可參考這篇教程
按照這篇教程的步驟一步步完成即可
需要注意的是一下兩個報錯

報錯一
在創建完成my_user后試圖連接會報錯如下
psql: FATAL: Peer authentication failed for user "my_user"
參考這篇教程需要改的檔案的部分內容要改成如下形式，要不然還是會報錯

# Database administrative login by Unix domain socket
local   all             postgres                                md5

# TYPE  DATABASE        USER            ADDRESS                 METHOD

# "local" is for Unix domain socket connections only
local   all             all                                     trust
# IPv4 local connections:
host    all             all             127.0.0.1/32            md5
# IPv6 local connections:
host    all             all             ::1/128                 md5
# Allow replication connections from localhost, by a user with the
# replication privilege.
local   replication     all                                     peer
host    replication     all             127.0.0.1/32            md5

（我記得要改的內容只有第一行的md5和第二行的trust？）
報錯二
在呼叫連接資料庫中，會提示不存在資料
解決方式可參考這篇博客
輸入CREATE DATABASE chainlink WITH OWNER my_user ENCODING 'UTF8';可解決
結果如下

                                   List of databases
    Name     |  Owner   | Encoding |   Collate   |    Ctype    |   Access privileges   
-------------+----------+----------+-------------+-------------+-----------------------
 chainlink | my_user  | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 

現在我們的PostgreSQL也已經配置完畢

搭建chainlink節點

搭建程序可參考這篇博客

部署LinkToken合約

首先需要在已經建立好的私有鏈上部署LinkToken.sol合約
以如下方式啟動geth

sudo geth --datadir ./ -networkid 47505 --rpc --ws --rpcaddr "0.0.0.0" --rpcport 80 --allow-insecure-unlock console

啟動的 --rpc --ws 為必須
--rpcaddr "0.0.0.0" 與 --rpcport 80 視配置要求決定

將合約部署在私鏈上如下，利用transfer函式可以進行轉LINK幣操作

組態檔搭建chainlink節點

首先在我們的chainlink目錄下

mkdir .chainlink
cd .chainlink
vim .env

填入如下引數

ROOT=/chainlink
LOG_LEVEL=debug
ETH_CHAIN_ID=47505			// 你的ChainID
MIN_OUTGOING_CONFIRMATIONS=0
MIN_INCOMING_CONFIRMATIONS=0
LINK_CONTRACT_ADDRESS=0xC64E8Ae217d72cd8cFdf321Db81227E0e05C9661  //部署LinkToken合約地址
CHAINLINK_TLS_PORT=0
SECURE_COOKIES=false
ALLOW_ORIGINS=*
ETH_URL=ws://localhost:8546		// RPC介面地址
DATABASE_URL=postgresql://my_user:123@localhost:5432/chainlink?sslmode=disable  
DATABASE_TIMEOUT=0

在DATABASE_URL 需要注意的要點是

• my_user 是資料庫的用戶名，即創建資料庫時你自己創建的用戶
• 123是創建資料庫的密碼
• localhost:5432是psql的埠地址 (好像是
• chainnlink是你創建的database的名字

啟動chainlink

.chainlink下輸入

docker run --net host  -p 6688:6688 -v ~/.chainlink:/chainlink -it --env-file=.env smartcontract/chainlink local n

提示輸入密碼、郵箱、郵箱密碼后，即可進入

瀏覽器輸入你的ip:6688即可進入chainlink控制臺

到此為止，我們的本地私有鏈的chainlink節點已經部署完畢啦！

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