peer channel create

创建一个通道，并将创世块写入文件。

使用方法

~$ peer channel create [flags]

命令标志

  -c, --channelID string     In case of a newChain command, the channel ID to create. It must be all lower case, less than 250 characters long and match the regular expression: [a-z][a-z0-9.-]*
  -f, --file string          Configuration transaction file generated by a tool such as configtxgen for submitting to orderer
  -h, --help                 help for create
      --outputBlock string   The path to write the genesis block for the channel. (default ./<channelID>.block)
  -t, --timeout duration     Channel creation timeout (default 5s)

全局标志：

      --cafile string                       Path to file containing PEM-encoded trusted certificate(s) for the ordering endpoint
      --certfile string                     Path to file containing PEM-encoded X509 public key to use for mutual TLS communication with the orderer endpoint
      --clientauth                          Use mutual TLS when communicating with the orderer endpoint
      --connTimeout duration                Timeout for client to connect (default 3s)
      --keyfile string                      Path to file containing PEM-encoded private key to use for mutual TLS communication with the orderer endpoint
  -o, --orderer string                      Ordering service endpoint
      --ordererTLSHostnameOverride string   The hostname override to use when validating the TLS connection to the orderer.
      --tls                                 Use TLS when communicating with the orderer endpoint

示例代码

本部分示例在peer channel create命令中使用全局标志--orderer指定排序器。

下面的示例基于在文件./createchannel.txn中的配置交易创建一个通道mychannel，使用 的排序器端结点为orderer.example.com:7050：

~$ peer channel create -c mychannel -f ./createchannel.txn --orderer orderer.example.com:7050

2018-02-25 08:23:57.548 UTC [channelCmd] InitCmdFactory -> INFO 003 Endorser and orderer connections initialized
2018-02-25 08:23:57.626 UTC [channelCmd] InitCmdFactory -> INFO 019 Endorser and orderer connections initialized
2018-02-25 08:23:57.834 UTC [channelCmd] readBlock -> INFO 020 Received block: 0
2018-02-25 08:23:57.835 UTC [main] main -> INFO 021 Exiting.....

返回第0块表示通道已经成功创建。

下面的示例展示peer channel create命令选项的用法。在该示例中使用的排序器为orderer.example.com:7050， 创建新的通道mychannel所需要的配置更新交易定义在文件./createchannel.txn中，等待30秒以便通道创建 成功：

~$ peer channel create -c mychannel --orderer orderer.example.com:7050 -f ./createchannel.txn -t 30s

2018-02-23 06:31:58.568 UTC [channelCmd] InitCmdFactory -> INFO 003 Endorser and orderer connections initialized
2018-02-23 06:31:58.669 UTC [channelCmd] InitCmdFactory -> INFO 019 Endorser and orderer connections initialized
2018-02-23 06:31:58.877 UTC [channelCmd] readBlock -> INFO 020 Received block: 0
2018-02-23 06:31:58.878 UTC [main] main -> INFO 021 Exiting.....

使用ls命令查看创建好的通道创世块：

~$ ls -l

-rw-r--r-- 1 root root 11982 Feb 25 12:24 mychannel.block

上面可以看到通道mychannel已经成功创建，第0块已经加入到该通道的区块链中并 返回给节点，该区块在本地文件中存为mychannel.block。

第0块通常被称为创世块，因为它提供了通道的起始配置。