Neo私鏈

爲了研究Neo的代碼，須要看一下Neo到底怎麼運行的，在網絡上跑一個智能合約，而且調試該網絡。因此先搭建一個私鏈玩玩。

配置虛擬機

NEO 私有鏈的部署至少須要 4 臺服務器才能取得共識，每臺服務器對應一個共識節點。在阿里雲上能夠買按量付費的虛擬機（機器都是window server）。
記錄下四臺機器的內網IP地址，後面要用。

172.xxx.xxx.142

端口

若是你想讓外部程序訪問該節點的 API 須要開放防火牆端口：10331-10334, 20331-20334
阿里雲的vpc若是在一個安全組內就不須要設置。也能夠經過安全組開放全部入口。

阿里雲安全組

安裝運行時

• 運行環境

運行 NEO 節點須要安裝 .NET Core Runtime，須要安裝 1.0.1 或以上版本

• Windows 系統下的安裝方法

在 Windows 系統下安裝 .NET Core 很是方便，直接下載運行便可。

NOTE

Windows可能還須要安裝Microsoft Visual C++ 2015 Redistributable Update 3（https://www.microsoft.com/en-us/download/details.aspx?id=53840) ，不然後面沒法啓動Neo-CLI。

建立錢包

在四臺機器上分別建立錢包數據庫，數據庫文件會默認生成在neo-cli的目錄下面

create wallet wallet.json

• db3後綴名的數據庫文件不支持了

neo1

neo> create wallet wallet.db3
Wallet files in db3 format are not supported, please use a .json file extension.
neo> create wallet wallet.json
password: ********
password: ********
address: AS43TUy7VtuGpNJh2YC2NM3asTv3s6piyk
 pubkey: 02d57c9bbc42b45943867dff0180cb9df266b46db7d027a283eabc7c4b8819c86c

記錄下另外幾臺機器的錢包公鑰
neo2

address: AY35ZjJayg9JfmCeHg1nySN4LSMntFEq2h
 pubkey: 035022ce81faca930ebe6b9f8e830526150e47692f19f58affe1311e42cd0d43bb

neo3

address: AQZNtdGVXbfot5fSaR4ijBqrEwbnFQspmH
 pubkey: 029f21d56f9422e55f0ef7cf75c092854e01c99aeee73f0effeaa489a96fc7d2b1

neo4

address: AXctyT8ctWTXtWaUFM9o5FJas8BWdBbiqe
 pubkey: 02dc0e750e21c386537618079d89836eea39fad396206e2e56cfba16bdc014dc5d

修改節點的配置文件

{
  "ProtocolConfiguration": {
    "Magic": 1,
    "AddressVersion": 23,
    "StandbyValidators": [
      "02d57c9bbc42b45943867dff0180cb9df266b46db7d027a283eabc7c4b8819c86c",
      "035022ce81faca930ebe6b9f8e830526150e47692f19f58affe1311e42cd0d43bb",
      "029f21d56f9422e55f0ef7cf75c092854e01c99aeee73f0effeaa489a96fc7d2b1",
      "02dc0e750e21c386537618079d89836eea39fad396206e2e56cfba16bdc014dc5d"
    ],
    "SeedList": [
      "172.24.198.142:10333",
      "172.24.198.141:10333",
      "172.24.198.140:10333",
      "172.24.198.139:10333"
    ],
    "SystemFee": {
      "EnrollmentTransaction": 0,
      "IssueTransaction": 0,
      "PublishTransaction": 0,
      "RegisterTransaction": 0
    }
  }
}

打開錢包，開啓共識

open wallet wallet.json
start consensus

若是前面打開過cli，請刪除chain目錄下的文件，這樣區塊鏈高度會從1開始。

• 截取其中一個打印，後面方便調試的時候研究

neo> open wallet wallet.json
password: ********
neo> start consensus
[18:04:31] OnStart
[18:04:31] initialize: height=1 view=0 index=0 role=Backup
[18:04:47] OnChangeViewReceived: height=1 view=0 index=2 nv=2
[18:05:01] timeout: height=1 view=0 state=Backup
[18:05:01] request change view: height=1 view=0 nv=1 state=Backup, ViewChanging
[18:05:58] OnPrepareRequestReceived: height=1 view=0 index=1 tx=1
[18:05:58] send perpare response
[18:06:01] OnPrepareResponseReceived: height=1 view=0 index=2
[18:06:01] relay block: 0x8515184285fa2e454b0eca441580b5cce01cc0e5cb5dd6d7ff53ef13ec7f665e
[18:06:01] persist block: 0x8515184285fa2e454b0eca441580b5cce01cc0e5cb5dd6d7ff53ef13ec7f665e
[18:06:01] initialize: height=2 view=0 index=0 role=Backup
[18:06:16] OnPrepareRequestReceived: height=2 view=0 index=2 tx=1
[18:06:16] send perpare response
[18:06:19] OnPrepareResponseReceived: height=2 view=0 index=1
[18:06:19] relay block: 0x35b163f4f524a1ebcc1ef3053e878f9bb37b1f4a8531a060ef18cfd6efefdf45
[18:06:19] persist block: 0x35b163f4f524a1ebcc1ef3053e878f9bb37b1f4a8531a060ef18cfd6efefdf45
[18:06:19] initialize: height=3 view=0 index=0 role=Backup
[18:06:49] timeout: height=3 view=0 state=Backup
[18:06:49] request change view: height=3 view=0 nv=1 state=Backup, ViewChanging
[18:06:49] OnChangeViewReceived: height=3 view=0 index=1 nv=1
[18:06:53] OnChangeViewReceived: height=3 view=0 index=2 nv=1
[18:06:53] initialize: height=3 view=1 index=0 role=Backup
[18:06:55] OnPrepareRequestReceived: height=3 view=1 index=2 tx=1
[18:06:55] send perpare response
[18:06:55] OnPrepareResponseReceived: height=3 view=1 index=1
[18:06:55] relay block: 0x1766a0602903f513f76561c93fddf312f70d30801310abfecacc89feace5c412
[18:06:55] persist block: 0x1766a0602903f513f76561c93fddf312f70d30801310abfecacc89feace5c412
[18:06:55] initialize: height=4 view=0 index=0 role=Primary
[18:07:10] timeout: height=4 view=0 state=Primary
[18:07:10] send perpare request: height=4 view=0
[18:07:13] OnPrepareResponseReceived: height=4 view=0 index=3
[18:07:13] OnPrepareResponseReceived: height=4 view=0 index=2
[18:07:13] relay block: 0x5233d9086db97e59f86d73e8735093c1b3fe4569759697ff8a04e0eb8f389091
[18:07:13] persist block: 0x5233d9086db97e59f86d73e8735093c1b3fe4569759697ff8a04e0eb8f389091
[18:07:13] initialize: height=5 view=0 index=0 role=Backup

提取Neo

原來文章中有提取neo和gas的方法，可是我如今還不知道爲何要提取Neo，有什麼意義，先跟着文檔跑着看看。我用的window server會遇到crash，詳情請看https://github.com/neo-project/neo-gui/issues/171
但願Neo社區的大牛能解決一下這個問題。

一天後，社區給出的解決方案https://github.com/neo-project/neo-gui/issues/171，須要下載兩個包

結論

雖然配置成功了，可是還不知道能幹嘛，須要進一步研究。提取Neo也遇到崩潰的狀況，發現這個問題，也算作貢獻了。

參考文章

基於NEO的私鏈(Private Blockchain)
用 NEO 節點搭建私有鏈 做者：沈寅 連接：https://www.jianshu.com/p/df476db9aad5